HK1186011B - Wireless electronic device with antenna switching circuitry - Google Patents

Description

Wireless electronic device with antenna switching circuit

Technical Field

The present invention relates generally to electronic devices, and more particularly, to wireless electronic devices that wirelessly communicate in multiple frequency bands.

Background

Electronic devices such as handheld electronic devices and other portable electronic devices are becoming increasingly popular. Examples of handheld devices include cellular telephones, handheld computers, media players, and hybrid devices that include the functionality of multiple devices of this type. Popular portable electronic devices that are somewhat larger than conventional handheld electronic devices include laptop computers and tablet computers.

Due in part to the mobile nature of portable electronic devices, wireless communication capabilities are often provided to portable electronic devices. For example, the portable electronic device may communicate with a wireless base station using long-range wireless communications and may use short-range wireless communication links, e.g., for supporting 2.4GHz and 5.0GHz(IEEE 802.11) frequency band and 2.4GHzA link of a frequency band.

Wireless electronic devices are often used for simultaneous communication using different technologies. For example, a wireless electronic device may be used to simultaneously communicate to a cellular network andthe network transmits the data. Designing wireless electronic devices that accommodate simultaneous communication using different technologies can be challenging. For example, a filter with high isolation may be needed to filter the interference between cells andcellular transceiver circuitry and method for transmitting radio frequency signals using the same antennaThe transceiver circuitry is isolated.

It is therefore desirable to be able to provide electronic devices with improved wireless communication capabilities.

Disclosure of Invention

A wireless electronic device may include antennas formed at different locations on the device. For example, the antennas may be formed at opposite ends of the device. The wireless electronic device may include a transceiver for passingIn the same frequency band, to transmit and receive radio frequency signals for wireless communication in the frequency band. The transceiver may includeTransceivers and cellular transceivers, such as Long Term Evolution (LTE) transceivers. The wireless electronic device may include antenna switching circuitry interposed between the transceiver and the antenna. The wireless electronic device may include control circuitry, such as storage and processing circuitry and baseband circuitry, that controls the antenna switching circuitry to ensure that radio frequency transmissions in adjacent frequency bands are routed to different antennas. By routing radio frequency transmissions in adjacent frequency bands to different antennas, interference between communications in adjacent frequency bands may be reduced.

The base station may assign a cellular frequency band to the wireless electronic device. The wireless electronic device may perform antenna transmit diversity operations to determine which antenna to use for cellular communications in the assigned cellular frequency band. The wireless electronic device may identify whether the assigned cellular frequency band is in use by the deviceThe frequency bands are adjacent. Responsive to identifying the allocated cellular band with theFrequency band proximity, the wireless electronic device may configure the antenna switching circuitry to be to and from an antenna different from an antenna used for cellular communicationThe communication is routed.

The wireless electronic device may reduce interference between communications in adjacent frequency bands by dividing wireless communications in time (e.g., by performing time division multiplexing). Radio frequency signals in a first frequency band may be transmitted during periods alternating with periods allocated to a second frequency band, wherein the second frequency band is adjacent to the first frequency band.

Other features, aspects, and advantages of the present invention will become more apparent from the accompanying drawings and the following detailed description.

Drawings

Fig. 1 is a perspective view of an exemplary electronic device with antenna switching capabilities in accordance with an embodiment of the present invention.

Fig. 2 is a schematic diagram of an exemplary electronic device having wireless communication circuitry in accordance with an embodiment of the present invention.

Fig. 3 is a diagram illustrating how radio frequency transceiver circuitry may be coupled to one or more antennas within an electronic device according to an embodiment of the present invention.

Fig. 4 is a diagram illustrating two adjacent frequency bands according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of a wireless communication circuit with antenna switching circuitry in accordance with an embodiment of the present invention.

Fig. 6 is a flowchart of exemplary steps that may be performed to control an antenna switching circuit such that wireless communications in adjacent frequency bands are routed to different antennas in accordance with an embodiment of the present invention.

FIG. 7 is a schematic diagram illustrating how embodiments of the invention may be paired in timeCommunications and LTE communications are divided to avoid self-interference.

Detailed Description

The present invention relates generally to wireless communications, and more particularly to wireless electronic devices that perform antenna switching to ensure radio frequency signals in adjacent frequency bands are routed to different antennas.

The wireless electronic device may be a portable electronic device such as a laptop computer or a small portable computer of the type sometimes referred to as ultra-portable. The portable electronic device may include a tablet computing device (e.g., a portable computer including a touch screen display). The portable electronic device may also be a slightly smaller device. Examples of more compact portable electronic devices include wrist watch devices, pendant devices, earphone and headphone devices, and other wearable and miniature devices. With one suitable arrangement, the portable electronic device may be a handheld electronic device.

The wireless electronic device may be: such as cellular telephones, media players with wireless communication capabilities, handheld computers (also sometimes referred to as personal digital assistants), remote controls, Global Positioning System (GPS) devices, tablet computers, and handheld gaming devices. The wireless electronic device may also be a hybrid device combining the functionality of a plurality of legacy devices. Examples of hybrid portable electronic devices include: cellular telephones that include media player functionality, gaming devices that include wireless communication capabilities, cellular telephones that include gaming and email functionality, and portable devices that receive email, support mobile telephone calls, have music player functionality, and support web browsing. These are merely illustrative examples.

An exemplary wireless electronic device according to an embodiment of the present invention is shown in fig. 1. The device 10 in fig. 1 may be, for example, a portable electronic device.

The device 10 may have a housing 12. An antenna for handling wireless communications may be located within housing 12 (as an example).

The housing 12, sometimes referred to as a case, may be formed of any suitable material, including plastic, glass, ceramic, metal, or other suitable material, or a combination of materials. In some cases, the housing 12 or a portion of the housing 12 may be formed of a dielectric or other low conductivity material such that operation of the conductive antenna element located near the housing 12 is not interrupted. The housing 12 or a portion of the housing 12 may also be formed from a conductive material such as a metal. An exemplary housing material that may be used is anodized aluminum. Aluminum is relatively light in weight and has an attractive insulating and scratch-resistant surface when anodized. Other materials may also be used for the housing of the device 10, such as stainless steel, magnesium, titanium, alloys of these and other metals, and the like, if desired. Where the housing 12 is formed from metallic elements, one or more of these metallic elements may be used as part of an antenna in the device 10. For example, a metal portion of the housing 12 may be shorted to an internal ground plane in the device 10 to create a larger ground plane element of the device 10. To facilitate electrical contact between the anodized aluminum housing and other metal components in the apparatus 10, portions of the anodized surface layer of the anodized aluminum housing can be selectively removed during the manufacturing process (e.g., by laser etching).

The housing 12 may have a bezel 14. Bezel 14 may be formed from a conductive material and may be used to secure a display or other device having a planar surface to device 10. For example, as shown in fig. 1, bezel 14 may be used to secure display 16 by attaching display 16 to housing 12.

The display 16 may be a Liquid Crystal Diode (LCD) display, an Organic Light Emitting Diode (OLED) display, or any other suitable display. The outermost surface of display 16 may be formed from one or more plastic or glass layers. If desired, touch screen functionality may be integrated into the display 16, or a separate touch pad device may be used to provide touch screen functionality. An advantage of integrating a touch screen into the display 16 to make the display 16 touch sensitive is that this type of arrangement can save space and reduce visual clutter.

Display screen 16 (e.g., a touch screen) is merely one example of an input-output device that may be used with electronic device 10. The electronic device 10 may have other input-output devices, if desired. For example, the electronic device 10 may have input-output control devices such as buttons 19 and input-output components such as ports 20 and one or more input-output jacks (e.g., for audio and/or video). The button 19 may be, for example, a menu button. The port 20 may include a 30 pin data connector (as an example). Openings 24 and 22 may form microphone and speaker ports, if desired. In the example of fig. 1, the display screen 16 is shown mounted at the front of the portable electronic device 10, but if desired, the display screen 16 may be mounted at the back of the portable electronic device 10, at the side of the device 10, at a flip portion of the device 10 that is attached to a main body portion of the device 10 by, for example, a hinge, or using any other suitable mounting arrangement.

A user of device 10 may supply input commands using user input interface devices such as buttons 19 and touch screen 16. Suitable user input interface devices for the electronic device 10 include buttons (e.g., alphanumeric keys, power switches, power on, power off, and other specialized buttons, etc.), a touch pad, a click bar, or other cursor control device, a microphone for supplying voice commands, or any other suitable interface for controlling the device 10. Although schematically illustrated in the example of FIG. 1 as being on a top surface of electronic device 10, buttons such as button 19 and other user input interface devices may generally be formed on any suitable portion of electronic device 10. For example, buttons such as button 19 or other user interface controls may be formed on the side of the electronic device 10. Buttons and other user interface controls may also be located on the top, rear, or other portions of device 10. If desired, the device 10 may be remotely controlled (e.g., using an infrared remote control, a radio frequency remote control such as a Bluetooth remote control, etc.).

Electronic device 10 may have a port such as port 20. Port 20 may sometimes be referred to as a connection port, a 30 pin port connector, an input-output port, or a bus connector, and port 20 may serve as an input-output port (e.g., when connecting device 10 to a companion port connected to a computer or other electronic device). The device 10 may also have audio and video jacks that allow the device 10 to communicate with external components. Typical ports include: a power outlet for recharging a battery within device 10 or operating device 10 from a Direct Current (DC) power source; a data port for exchanging data with an external component such as a personal computer or a peripheral device; an audio-visual jack for driving a headset, monitor or other external audio-video device; a Subscriber Identity Module (SIM) card port for authorizing cellular telephone service; memory card slots, etc. An input interface device such as a touch screen display 16 may be used to control the functions of some or all of these devices and internal circuitry in device 10.

Components such as the display 16 and other user input interface devices may cover a large portion of the available surface area on the front of the device 10 (as shown in the example of fig. 1), or may occupy only a small portion of the front of the device 10. Because electronic components such as display 16 typically contain a large amount of metal (e.g., as radio frequency shielding), the location of these components relative to the antenna elements in device 10 should typically be considered. A properly selected location of the antenna and electronic components of the device will allow the antenna of the electronic device 10 to function properly without interruption by the electronic components.

Examples of locations in device 10 where antenna structures may be located include area 18 (e.g., a first antenna) and area 21 (e.g., a second antenna). Region 18 may be spaced apart from region 21 by a distance D. These are merely illustrative examples. Any suitable portion of device 10 may be used to house the antenna structure of device 10, if desired.

Wireless electronic devices such as device 10 in fig. 2 may be provided with wireless communication circuitry. The wireless communication circuitry may be used to support long-range wireless communications, such as communications in a cellular telephone frequency band (e.g., a frequency range associated with a wireless standard or protocol). Examples of long range (cellular telephone) frequency bands that device 10 may handle include 800MHz frequency bands, 850MHz frequency bands, 900MHz frequency bands, 1800MHz frequency bands, 1900MHz frequency bands, 2100MHz frequency bands, 700MHz frequency bands, 2500MHz frequency bands, and others. Each long range frequency band may be associated with a range of frequencies. For example, the 850MHz band may be associated with the frequency range 824-. Examples of wireless standards or protocols associated with cellular telephone bands include the global system for mobile communications (GSM) standard, the Universal Mobile Telecommunications System (UMTS) standard, and standards that use technologies such as code division multiple access, time division multiplexing, frequency division multiplexing, and the like. The long range frequency band used by the device 10 may comprise the so-called LTE (long term evolution) frequency band. The LTE bands are numbered (e.g., 1, 2, 3, etc.) and are sometimes referred to as E-UTRA operating bands. By way of example, LTE band 7 corresponds to uplink frequencies between 2.5GHz and 2.57GHz (e.g., frequencies used to transmit wireless signals to a base station) and downlink frequencies between 2.62GHz and 2.69GHz (e.g., frequencies used to receive wireless signals from a base station).

The wireless communication circuitry of device 10 may receive long range signals, such as signals associated with satellite navigation bands. For example, device 10 may use wireless circuitry to receive signals in the 1575MHz frequency band associated with Global Positioning System (GPS) communications. The wireless circuitry of device 10 may also support short-range wireless communications. For example, device 10 may include circuitry for handling local area network links (e.g., 2.4GHz and 5 GHz)Link, bluetooth link at 2.4GHz and bluetooth low energy link, etc.).

As shown in fig. 2, device 10 may include storage and processing circuitry 28. The storage and processing circuitry 28 may include storage devices, such as hard disk drive storage devices, non-volatile memory (e.g., flash memory or other electrically programmable read-only memory configured to form a solid-state drive), volatile memory (e.g., static or dynamic random access memory), and so forth. Processing circuitry in storage and processing circuitry 28 may be used to control the operation of device 10. Such processing circuitry may be based on one or more microprocessors, microcontrollers, digital signal processors, application specific integrated circuits, and the like.

The storage and processing circuitry 28 may be used to run software on the device 10 such as internet browsing applications, Voice Over Internet Protocol (VOIP) telephone call applications, email applications, media playback applications, operating system functions, radio frequency transmission and reception related functions such as selection of communication frequencies, and the like. To support interaction with external devices, the storage and processing circuitry 28 may be used to implement a communications protocol. Communication protocols that may be implemented using storage and processing circuitry 28 include internet protocols, wireless local area network protocols (e.g., IEEE802.11 protocols-sometimes referred to as IEEE802.11 protocols)) Protocols for other short-range wireless communication links (e.g., bluetooth protocol), cellular telephone protocols, MIMO (multiple input multiple output) protocols, antenna diversity protocols, and the like. Software stored and executed on device 10, such as on storage and processing circuitry 28, may be used to control wireless communication operations, such as communication frequency selection.

The electronic device 10 may include a wireless communication circuit 34 for wirelessly communicating with external devices. Thus, the electronic device 10 may sometimes be referred to as a wireless device or wireless electronic device. Wireless communication circuitry 34 may include Radio Frequency (RF) transceiver circuitry formed from one or more integrated circuits, baseband circuitry, power amplifier circuitry, low noise input amplifiers, passive RF components, one or more antennas, transmission lines, and other circuitry such as front end circuitry for processing RF wireless signals. Wireless signals may also be transmitted using light (e.g., using infrared communication).

The wireless communication circuitry 34 may include radio frequency transceiver circuitry for handling various radio frequency communication bands. For example, circuitry 34 may include transceiver circuitry that handles the 2.4GHz and 5GHz bands for WiFi (IEEE 802.11) communications and/or the 2.4GHz band for Bluetooth communications. Circuitry 34 may include cellular telephone transceiver circuitry for handling wireless communications in cellular telephone bands such as 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, LTE bands, and other bands (as examples). The circuit 34 may process both voice data and non-voice data. If desired, the wireless communication circuitry 34 may include a Global Positioning System (GPS) receiver device for receiving a 1575MHz GPS signal or for processing other satellite positioning data.

The wireless communication circuitry 34 may include one or more antennas 40. Any suitable antenna type may be used to form antenna 40. For example, antenna 40 may include an antenna having a resonating element formed from a loop antenna structure, a patch antenna structure, an inverted-F antenna structure, a slot antenna structure, a planar inverted-F antenna structure, a helical antenna structure, a hybrid of these designs, and so forth. Different types of antennas may be used for different frequency bands and combinations of frequency bands. For example, one type of antenna may be used to form a local wireless link antenna, while another type of antenna may be used to form a remote wireless link antenna.

An antenna diversity scheme may be implemented in which multiple redundant antennas are used to handle communications for a particular frequency band or bands. In an antenna diversity scheme, the storage and processing circuitry 28 may select which antenna to use based on signal strength measurements or other data in real time. For example, the storage and processing circuitry 28 may select which antenna to use for LTE communications with the base station. In a Multiple Input Multiple Output (MIMO) scheme, multiple data streams may be transmitted and received using multiple antennas, thereby improving data throughput.

Exemplary locations where antenna 40 may be formed in device 10 are shown in fig. 3. As shown in fig. 3, electronic device 10 may have a housing, such as housing 12. The housing 12 may include plastic walls, metal housing structures, structures formed from carbon fiber materials or other composites, glass, ceramic, or other suitable materials. The housing 12 may be formed using a single piece of material (e.g., using a unitary configuration), or may be formed from a frame, housing walls, and other individual components that are assembled to form a complete housing structure. The components of the apparatus 10 shown in fig. 1 may be mounted within a housing 12. The antenna structure 40 may be mounted within the housing 12 and may be formed using multiple portions of the housing 12 if desired. For example, housing 12 may include metal housing sidewalls, peripheral conductive elements such as ribbon elements (with or without dielectric gaps), conductive bezels, and other conductive structures that may be used to form antenna structure 40.

As shown in fig. 3, antenna structure 40 may be coupled to transceiver circuitry 90 by a path, such as path 45. Path 45 may include a transmission line structure such as a coaxial cable, a microstrip transmission line, a stripline transmission line, or the like. Path 45 may also include impedance matching circuitry, filtering circuitry, and switching circuitry. Impedance matching circuitry may be used to ensure that antenna 40 is efficiently coupled to transceiver circuitry 90 in the communications band of interest. Filter circuits may be used to implement frequency-based multiplexing circuits such as diplexers, duplexers, and triplexers. Switching circuitry may be used to selectively couple antenna 40 to a desired port of transceiver circuitry 90. For example, in one mode of operation, a switch may be configured to route one of paths 45 to a given antenna, while in another mode of operation, the switch may be configured to route a different one of paths 45 to the given antenna. The use of switching circuitry between transceiver circuitry 90 and antenna 40 allows device 10 to support multiple communication bands of interest using a limited number of antennas.

In devices having an elongated rectangular profile, such as cellular telephones, it may be desirable to locate the antenna 40 at one or both ends of the device. For example, as shown in fig. 3, some antennas 40 may be disposed in an upper end region 42 of housing 12 and some antennas 40 may be disposed in a lower end region 44 of housing 12. The antenna structure in device 10 may include a single antenna in region 42, a single antenna in region 44, multiple antennas in region 42, multiple antennas in region 44, or may include one or more antennas located elsewhere in housing 12.

The antenna structure 40 may be formed in some or all of the areas such as the areas 42 and 44. For example, an antenna such as antenna 40T-1 may be located in region 42-1, or an antenna filling some or all of region 42-1, such as antenna 40T-2, may be formed. An antenna such as antenna 40B-1 may fill some or all of region 44-2, or an antenna such as antenna 40B-2 may be formed in region 44-1. These types of arrangements need not be mutually exclusive. For example, region 44 may contain a first antenna, such as antenna 40B-1, and a second antenna, such as antenna 40B-2.

The transceiver circuit 90 may include a transmitter, such as the transmitter 48, and a receiver, such as the receiver 50. One or more integrated circuits (e.g., cellular telephone communication circuit, wireless local area network communication circuit, for bluetooth) may be usedCircuitry for communicating, circuitry for receiving satellite navigation system signals) to implement the transmitter 48 and the receiver 50. The transceiver circuit 90 may be formed from associated power amplifier circuits for boosting transmit signal power, low noise power amplifier circuits for boosting receive signal power, other suitable wireless communication circuits, and combinations thereof.

Device 10 may communicate simultaneously using various wireless technologies (e.g., wireless standards and/or protocols). Fig. 4 shows an illustrative example in which the device 10 is usedAnd LTE transmits radio frequency signals. Can be arranged inTransmitting in the 2.4GHz band (e.g., frequencies from about 2.4GHz to about 2.48 GHz)A signal. LTE signals may be transmitted in LTE band 7 (e.g., frequencies between approximately 2.5GHz to 2.57 GHz). These bands may be adjacent to each other.

The wireless communication circuitry (e.g., circuitry 34) in device 10 may include non-linear components, such as transistors. A radio frequency signal (e.g.,signals and LTE signals) may potentially generate non-linear components that interfere with wireless communications. For example, non-linear operation of wireless communication circuitry may resultInter-modulation between signals and LTE signals. Such intermodulation may be inAnd inter-modulation products (e.g., unwanted radio frequency signals) are generated at frequencies within the LTE frequency band. For example, a third order intermodulation between signals of the first and second frequencies may generate a signal (e.g., an intermodulation product) having a frequency of the first frequency minus twice the second frequency and a frequency of the second frequency minus twice the first frequency.

Consider a 2.48GHz signal (e.g.,signal) is transmitted simultaneously with a 2.5GHz signal (e.g., LTE band 7 signal). In this case, it may be inThird order intermodulation products 302 and 304 are generated at 2.46GHz and 2.52GHz within the 2.4GHz band and LTE band 7. Intermodulation products 302 and 304 may interfere with 2.46GHZ and 2.52GHZAnd LTE communication. This example is merely illustrative. Signals at any two frequencies that are transmitted simultaneously may potentially generate unwanted signals associated with nonlinear operation of components in device 10.

To reduce interference between wireless communications in different frequency bands (e.g. 2.4 GHz)Between communications and communications in LTE band 7), adjacent bands may be transmitted simultaneously using antennas located at opposite ends of device 10. For example, LTE communication may be assigned to an upper antenna, such as antenna 40T-1, located in area 42 (e.g., an upper portion of device 10), while LTE communication may be assigned to an upper antennaCommunications are distributed to lower antennas, such as antenna 40B-1 of region 44 (e.g., the lower portion of device 10). Transmitting LTE signals by using upper antenna 40-T and transmitting using lower antenna 40B-1Signal, LTE andinterference between signals (e.g., because each antenna can receive radio frequency signals from other antennas at reduced power, thereby reducing intermodulation effects). The adjacent frequency bands may be any two frequency bands that are sufficiently close in frequency, which isSimultaneous transmissions in the two frequency bands may interfere with each other (e.g., due to non-linear operation of device 10).

Antenna diversity, such as antenna transmit diversity, may be performed to dynamically select which antenna to use for wireless communications. For example, antenna transmit diversity may be performed to optimize cellular communications (e.g., LTE communications) between device 10 and a base station (e.g., base station 6). In this case, the cellular radio frequency signal may be transmitted using a selected one of the upper or lower antennas based on the quality of the communication link between the device 10 and the base station. Fig. 5 shows an illustrative example in which device 10 is provided with antenna switching circuitry 102 that accommodates antenna transmit diversity while ensuring that wireless communications in adjacent frequency channels are routed to different antennas.

As shown in fig. 5, the antenna switching circuit 102 may have ports T1, T2, T3, and T4. Port T3 may be coupled to a first antenna 40A and port T4 may be coupled to a second antenna 40B. Antenna 40A may be an upper antenna, such as antennas 40T-1 and 40T-2, and antenna 40B may be a lower antenna, such as antennas 40B-1 and 40B-2. The ports T1 and T2 may correspond to respective frequency bands that are adjacent to one another (e.g., intermodulation products that are close enough in frequency to generate interference during simultaneous radio frequency transmissions). In the example of FIG. 5, ports T1 andcommunication in the 2.4GHz band corresponds, while port T2 corresponds with LTE band 7 (e.g., close toA frequency band of the 2.4GHz band). This example is merely illustrative. Switching circuit 102 may be made up of any desired number of terminals, if desired. For example, switching circuitry 102 may be coupled to two or more antennas and may have ports associated with two or more adjacent frequency bands.

The switching circuit 102 may be formed as part of the rf front end 44. The radio frequency front end may include filtering circuitry, such as a duplexer 54. The duplexer 54 may be coupled to port T2 of the switching circuit 102 and may divide the signal at port T2 of the switching circuit 102 into portions associated with LTE band 7 uplink and downlink frequencies. For example, the duplexer 54 may include a high pass filter that passes LTE band 7 downlink (RX) frequencies (e.g., between 2.62GHZ and 2.69 GHZ) and a low pass filter that passes LTE band 7 uplink (TX) frequencies (e.g., between 2.50GHZ and 2.57 GHZ).

During signaling operations (e.g., operations associated with an uplink frequency), the storage and processing circuitry 28 may provide data (e.g., one or more data streams) to the baseband circuitry 46 for transmission. The baseband circuitry 46 may receive transmit data and convert the data to a corresponding baseband signal, which is provided to the transceiver circuitry 90. Transceiver circuitry 90 may convert baseband signals to radio frequency signals and provide the radio frequency signals to switching circuitry 102. Switching circuitry 102 may select which antenna (e.g., antenna 40A or 40B) will be used to transmit the radio frequency signal. The radio frequency signals may be amplified by a Power Amplifier (PA), such as power amplifier 52, before being transmitted via antennas 40A and 40B.

During signal reception operations (e.g., operations associated with downlink frequencies), antennas 40A and 40B may receive radio frequency signals and provide the signals to switching circuitry 102 via ports T3 and T4. The switching circuit 102 may be configured to route received signals to the transceiver circuit 90 via an appropriate interface. For example, the switching circuit 102 may be configured to switch the circuit via port T1Signals are routed from antenna 40A to transceiver circuitry 90 and cellular signals are routed from antenna 40B to transceiver circuitry 90 via port T2 (or vice versa). The received signal may be passed through a Low Noise Amplifier (LNA), such as LNA 60Amplified to provide a radio frequency signal of sufficient strength to the receiver circuit 90 for processing. Transceiver circuitry 90 may receive radio frequency signals from switching circuitry 102 and provide corresponding baseband signals to baseband circuitry 46. The baseband circuitry 46 may process the baseband signal to obtain data from the baseband signal and provide the data to the storage and processing circuitry 28.

Switching circuitry 102 may be controlled via path 104 to route signals in adjacent frequency bands to the appropriate antennas. For example, switching circuitry 102 may be configured to route between transceiver circuitry 90 and antenna 40A via path 104 (e.g., by coupling port T1 to port T3)Signals, and the LTE band 7 signals are routed between transceiver circuitry 90 and antenna 40B (e.g., by coupling port T2 to T4). As another example, the switching circuit 102 may be configured to route between the transceiver 90 and the antenna 40B (e.g., by coupling port T1 to port T4 and port T2 to port T3)Signals and LTE band 7 signals are routed between transceiver circuitry 90 and antenna 40A.

Front-end circuit 44 may be formed with optional filtering and switching circuitry 106, if desired. Optional filtering and switching circuitry 106 may be interposed between switching circuitry 102 and antennas 40A and 40B. The filtering and switching circuitry 106 may include components such as diplexers, duplexers, triplexers, solid state switches, micro-electromechanical system (MEMS) switches, or other filtering and switching circuitry. The circuit 106 may include passive components and matching circuits, if desired. The filtering and switching circuit 106 may be adapted for wireless communication in additional frequency bands. For example, filtering and switching circuitry 106 may be coupled to transceiver circuitry 90 via optional path 110 and may be adapted to not communicate withWireless communication in 2.4GHz bands and/or bands adjacent to LTE band 7 (e.g., other long-range and short-range bands).

Storage and processing circuitry 28 may control switching circuitry 102 via path 104 to perform antenna transmit diversity for cellular wireless communications while ensuring that wireless communications in adjacent frequency bands are routed to different antennas (e.g., antennas located at opposite ends of device 10). Alternatively, baseband circuitry 46 (e.g., instead of or in combination with storage and processing circuitry 28) may control switching circuitry 102 via path 108. Fig. 6 shows a flowchart of example steps that may be performed (e.g., by the storage and processing circuitry 28 and/or the baseband circuitry 46) to control the switching circuitry 106 to ensure that wireless communications in adjacent frequency bands are routed to different antennas.

In step 202, processing circuitry 28 may select a frequency band for cellular communication. The frequency band may be selected based on control information received from a base station, such as base station 6. For example, the control information may direct the device 10 to communicate with a base station using a given frequency band. If LTE band 7 is selected (or withAny other frequency band adjacent to the 2.4GHz frequency band), the operation of step 206 may be performed. If choose not to interact withA frequency band adjacent to the 2.4GHz frequency band, the operation of step 204 may be performed.

The example in fig. 6 in which the process of step 206 is triggered using the selection of a band adjacent to the Wi-fi2.4ghz band is merely exemplary. In general, the processing of steps 206 and 208 may be triggered using selection of any frequency band that may potentially cause interference with other wireless communications (e.g., selection of a frequency band for a first transceiver that is adjacent to a frequency band used by a second transceiver). For example, the wireless communication circuit 34 may be used for bluetooth operation in the 2.4GHz band. In this case, cellular operation in an adjacent frequency band, such as LTE band 7, may potentially interfere with bluetooth communications in the 2.4GHz band, and the bluetooth communications may be assigned to an opposing antenna to the cellular communications (e.g., during step 208, the switching circuitry may be configured to select the opposing antenna for the bluetooth communications).

In step 204, the device 10 may operate normally. For example, device 10 may perform antenna transmit diversity operations during step 204 to select the best antenna for cellular transmission without modificationSignal paths (e.g., due to selected cellular frequency bands andinterference between frequency bands may be minimal). If processing circuitry 28 determines that the new frequency band should be used for cellular communications (e.g., if the base station instructs device 10 to communicate on the new frequency band), the process may return to step 202 via path 205.

In step 206, processing circuitry 28 may select an antenna for cellular communication (e.g., for communication in LTE band 7). For example, processing circuitry 28 may perform antenna transmit diversity operations to select antennas for cellular communications based on received signal strength or other indicators of the quality of the communication link between device 10 and a base station. Processing circuitry 28 may direct switching circuitry 102 to route cellular communications between transceiver circuitry 90 and the selected antenna.

In step 208, processing circuitry 28 may select for cellular communication based on the antenna selected for cellular communication in step 206An antenna for communication. For example, if an upper antenna, such as antenna 40T-1, is selected for cellular communication, processing circuitry 28 may select a lower antenna, such as antenna 40B-1By a partial antennaAnd (4) communication. In other words, an antenna located at an opposite end of device 10 (relative to the antenna selected for cellular communication) may be selected for cellular communicationAnd (4) communication. Processing circuitry 28 may provide control signals to switching circuitry 102 via path 104 to direct switching circuitry 102 to operate in transceiver circuitry 90 and/or in a non-volatile memoryInter-antenna routing for communication selectionAnd (4) communication.

Additional antenna transmit diversity operations may be performed to reselect antennas for cellular communications by returning to step 206 via path 210. If processing circuitry 28 determines that cellular communication should be conducted using the new frequency band (e.g., if the base station instructs device 10 to communicate on the new frequency band), the process may return to step 202 via path 212.

Will be provided withThe example of communications routed to an antenna different from the antenna used for LTE band 7 communications is merely exemplary. If desired, self-interference associated with intermodulation between any two (or more) adjacent frequency bands can be reduced by assigning a different antenna to each of these adjacent frequency bands. The antennas may be allocated by configuring the switching circuitry to route the radio frequency signals of each frequency band to selected antennas.

In another suitable embodiment, radio frequency self-interference associated with simultaneous communications in adjacent frequency bands may be avoided by dividing the wireless communications in time (sometimes referred to as time division multiplexing). FIG. 7 is a schematic view showingHow can be divided in timeAnd example timing diagrams for LTE communications to avoid self-interference. As shown in fig. 7, may beCommunications are allocated to time slot 302 and LTE communications may be allocated to time slot 304. The slots 302 and 304 may have associated lengths P1 and P2. Can be dynamically (e.g., based on)And bandwidth requirements for LTE communications) or times P1 and P2 may be statically configured. For example, the duration of time P1 may be increased (relative to the duration of time P2) to provide increased bandwidth for Wi-Fi communications, or the duration of time P1 may be decreased to provide increased bandwidth for cellular communications.

During time slot 302, an antenna switching circuit (e.g., antenna switching circuit 102 in fig. 5) may be configured to route between receiver circuit 90 and a selected antenna (e.g., an antenna selected during antenna transmit diversity operation)And (4) communication. During time slot 304, antenna switching circuitry 102 may be configured to route LTE communications between transceiver circuitry 90 and the selected antenna.

As an example, consider the case where antenna 40A in fig. 5 is selected for wireless communication. In this case, the antenna switching circuit 102 may be configured to couple port T1 to port T3 during period 302, and to couple port T2 to port T3 during period 304. By separating in timeCommunications and LTE communications, may reduce self-interference associated with non-linear operation of device 10 (e.g., due toTo the impossibility of simultaneously transmitting radio frequency signals in adjacent frequency bands at any given point in time).

Time division multiplexing may be performed in place of or in conjunction with the antenna switching in fig. 6 to reduce self-interference. For example, time division multiplexing such as that shown in fig. 7 may be performed during step 208 of fig. 6 to reduce interference with adjacent frequency bands (such as LTE bands 7 and 7)2.4GHz band).

The example of performing time division multiplexing for LTE and Wi-Fi communications in fig. 7 is merely exemplary. Time division multiplexing may be performed for simultaneous communications in adjacent frequency bands, if desired. For example, time division multiplexing may be performed for LTE communications and bluetooth communications to reduce self-interference.

According to one embodiment, there is provided a method of operating a wireless electronic device having at least first and second antennas located at opposite ends of the wireless electronic device, wherein the wireless electronic device is for communicating in at least first and second frequency bands, the method comprising: selecting, using a control circuit, one of the first antenna and the second antenna for radio frequency transmission in the first frequency band; and routing radio frequency transmit signals in the second frequency band to the second antenna using switching circuitry in response to selecting the first antenna for radio frequency transmission in the first frequency band.

According to another embodiment, the method further comprises: routing radio frequency transmit signals in the second frequency band to the first antenna using the switching circuitry in response to selecting the second antenna for radio frequency transmission in the first frequency band using the control circuitry.

According to another embodiment, the method further comprises: routing radio frequency transmit signals in the first frequency band to the first antenna using the switching circuit in response to selecting the first antenna using the control circuit.

According to another embodiment, the method further comprises: routing radio frequency transmit signals in the first frequency band to the second antenna using the switching circuit in response to selecting the second antenna using the control circuit.

According to another embodiment, the method further comprises: providing radio frequency signals in the first frequency band to the switching circuit using a first transceiver; and providing radio frequency signals in the second frequency band to the switching circuit using a second transceiver.

According to another embodiment, the first frequency band comprises a Wi-Fi frequency band, the second frequency band comprises a Long Term Evolution (LTE) frequency band, and the switching circuitry is interposed between the first and second antennas and the first and second transceivers, and the method further comprises: configuring, using the control circuitry, the switching circuitry in a first configuration in which the first antenna is coupled to the first transceiver and the second antenna is coupled to the second transceiver in response to selecting the first antenna for radio frequency transmission in the first frequency band; and in response to selecting the second antenna for radio frequency transmission in the first frequency band, configuring the switching circuit using the control circuit in a second configuration in which the first antenna is coupled to the second transceiver and the second antenna is coupled to the first transceiver.

According to another embodiment, the control circuitry includes a baseband processor, and selecting a given one of the at least first and second antennas for radio frequency transmission in the first frequency band includes: selecting, using the baseband processor, the given one of the at least first and second antennas for radio frequency transmission in the first frequency band.

According to one embodiment, there is provided an electronic device including: a first antenna and a second antenna; a first transceiver and a second transceiver, wherein the first transceiver is configured to generate radio frequency signals in a selected frequency band of a plurality of frequency bands; switching circuitry operable in a first configuration in which the first transceiver is coupled to the first antenna and the second transceiver is coupled to the second antenna, and further operable in a second configuration in which the first transceiver is coupled to the second antenna and the second transceiver is coupled to the first antenna; and a control circuit that controls which of the first configuration and the second configuration the switching circuit uses based on the selected frequency band.

According to another embodiment, the first antenna is located at a first end of the electronic device and the second antenna is located at a second end of the electronic device.

According to another embodiment, the first transceiver comprises a cellular transceiver.

According to another embodiment, the second transceiver comprises a Wi-Fi transceiver.

According to another embodiment, the cellular transceiver comprises a long term evolution transceiver.

According to one embodiment, there is provided a method of operating a wireless communication circuit, wherein the wireless communication circuit comprises a first transceiver for communicating using a plurality of frequency bands and a second transceiver for communicating using a given frequency band, and the method comprises: selecting a frequency band from the plurality of frequency bands for communication using the first transceiver; selecting an antenna from the first and second antennas for communication in the selected frequency band; determining whether communications in the selected frequency band using the first transceiver interfere with communications in the given frequency band; and routing communications from the first transceiver and the second transceiver to a counter antenna in response to determining that communications in the selected frequency band interfere with communications in the given frequency band.

According to another embodiment, the first transceiver comprises a cellular transceiver and the second transceiver comprises a Wi-Fi transceiver, and the method further comprises: transmitting radio frequency signals in the selected frequency band using the cellular transceiver; and transmitting radio frequency signals in the given frequency band using the Wi-Fi transceiver.

According to another embodiment, routing communications from the first transceiver and the second transceiver to the opposing antenna comprises: routing radio frequency signals transmitted in the selected frequency band to a first antenna using a switching circuit; and routing radio frequency signals transmitted in the given frequency band to a second antenna using the switching circuit.

According to another embodiment, the method further comprises: performing, using the switching circuit, time division multiplexing between communications in the selected frequency band and communications in the given frequency band in response to determining that communications in the selected frequency band interfere with communications in the given frequency band.

According to one embodiment, there is provided a method of operating a wireless electronic device having a first transceiver to communicate using a plurality of frequency bands and a second transceiver to communicate using a given frequency band, and comprising: selecting a frequency band from the plurality of frequency bands for communication using the first transceiver; selecting an antenna from the first antenna and the second antenna for communication in the selected frequency band; determining whether communications in the selected frequency band interfere with communications in the given frequency band; and in response to determining that the communication in the selected frequency band interferes with the communication in the given frequency band, performing time division multiplexing between the communication in the selected frequency band and the communication in the given frequency band using the switching circuit.

According to another embodiment, performing time division multiplexing between communications in the selected frequency band and communications in the given frequency band using the switching circuit includes: routing communications in the selected frequency band between the first transceiver and an antenna using switching circuitry during a first period of time; and routing communications in the selected frequency band between the second transceiver and the antenna using the switching circuit during a second time period.

According to another embodiment, the first transceiver comprises a long term evolution cellular transceiver and the second transceiver comprises a Wi-Fi transceiver, and the method further comprises: transmitting radio frequency signals in the selected frequency band using the long term evolution cellular transceiver; and transmitting radio frequency signals in the given frequency band using the second transceiver.

According to another embodiment, the plurality of frequency bands comprises a plurality of cellular frequency bands, the given frequency band comprises a Wi-Fi frequency band, and determining whether communications in the selected frequency band interfere with communications in the given frequency band comprises: determining whether the selected frequency band is adjacent to the Wi-Fi frequency band.

According to another embodiment, the plurality of frequency bands comprises a plurality of cellular frequency bands, the given frequency band comprises a bluetooth frequency band, and determining whether communications in the selected frequency band interfere with communications in the given frequency band comprises: determining whether the selected band is adjacent to the Bluetooth band.

According to one embodiment, there is provided a wireless electronic device for communicating in at least a first frequency band and a second frequency band, the wireless electronic device comprising: at least a first antenna and a second antenna located at opposite ends of the wireless electronic device; a control circuit configured to select one of the first and second antennas for radio frequency transmission in the first frequency band; and a switching circuit configured to route radio frequency transmit signals in the second frequency band to the second antenna in response to the control circuit selecting the first antenna for radio frequency transmission in the first frequency band.

According to another embodiment, the switching circuitry routes radio frequency transmit signals in the second frequency band to the first antenna in response to the control circuitry selecting the second antenna for radio frequency transmission in the first frequency band.

According to another embodiment, the switching circuitry routes radio frequency transmit signals in the first frequency band to the first antenna in response to the control circuitry selecting the first antenna.

According to another embodiment, the switching circuit routes the radio frequency transmit signal in the first frequency band to the second antenna in response to the control circuit selecting the second antenna.

According to another embodiment, the wireless electronic device further comprises: a first transceiver configured to provide radio frequency signals in the first frequency band to the switching circuit; a second transceiver configured to provide radio frequency signals in the second frequency band to the switching circuit.

According to another embodiment, the first frequency band comprises a Wi-Fi frequency band, wherein the second frequency band comprises a Long Term Evolution (LTE) frequency band, and wherein the switching circuitry is interposed between the first and second antennas and the first and second transceivers, wherein: in response to selecting the first antenna for radio frequency transmission in the first frequency band, the control circuitry configures the switching circuitry in a first configuration in which the first antenna is coupled to the first transceiver and the second antenna is coupled to the second transceiver; and in response to selecting the second antenna for radio frequency transmission in the first frequency band, the control circuitry configures the switching circuitry in a second configuration in which the first antenna is coupled to the second transceiver and the second antenna is coupled to the first transceiver.

According to another embodiment, the control circuitry comprises a baseband processor, and wherein selecting a given antenna of the at least first and second antennas for radio frequency transmission in the first frequency band comprises: the baseband processor selects the given antenna of the at least first and second antennas for radio frequency transmission in the first frequency band.

According to one embodiment, there is provided a wireless communication circuit comprising: a first antenna and a second antenna; a first transceiver to communicate using a plurality of frequency bands; a second transceiver for communicating using a given frequency band; a control circuit configured to: selecting a frequency band from the plurality of frequency bands for communication using the first transceiver, selecting an antenna from the first antenna and the second antenna for communication in the selected frequency band, determining whether communication in the selected frequency band using the first transceiver interferes with communication in the given frequency band; and a switching circuit configured to route communications from the first transceiver and the second transceiver to a counter-antenna in response to the control circuit determining that communications in the selected frequency band interfere with communications in the given frequency band.

According to another embodiment, the first transceiver comprises a cellular transceiver and wherein the second transceiver comprises a Wi-Fi transceiver, wherein: the cellular transceiver transmits radio frequency signals in the selected frequency band and the Wi-Fi transceiver transmits radio frequency signals in the given frequency band.

According to another embodiment, the switching circuitry routing communications from the first transceiver and the second transceiver to the opposing antenna comprises: the switching circuit routes radio frequency signals transmitted in the selected frequency band to the first antenna; and the switching circuit routes radio frequency signals transmitted in the given frequency band to a second antenna.

According to another embodiment, the switching circuit performs time division multiplexing between communications in the selected frequency band and communications in the given frequency band in response to the control circuit determining that communications in the selected frequency band interfere with communications in the given frequency band.

According to one embodiment, there is provided a wireless electronic device comprising: a first antenna and a second antenna; a first transceiver to communicate using a plurality of frequency bands; a second transceiver for communicating using a given frequency band; a control circuit configured to: selecting a frequency band from the plurality of frequency bands for communication using the first transceiver, selecting an antenna from the first antenna and the second antenna for communication in the selected frequency band, determining whether communication in the selected frequency band interferes with communication in the given frequency band; and a switching circuit configured to perform time division multiplexing between communications in the selected frequency band and communications in the given frequency band in response to determining that communications in the selected frequency band interfere with communications in the given frequency band.

According to another embodiment, the switching circuit performing time division multiplexing between communications in the selected frequency band and communications in the given frequency band comprises: the switching circuit routes communications in the selected frequency band between the first transceiver and an antenna during a first period of time; and the switching circuit routes communications in the selected frequency band between the second transceiver and the antenna during a second time period.

According to another embodiment, the first transceiver comprises a long term evolution cellular transceiver and wherein the second transceiver comprises a Wi-Fi transceiver, wherein: the long term evolution cellular transceiver transmitting radio frequency signals in the selected frequency band; and the second transceiver transmits radio frequency signals in the given frequency band.

According to another embodiment, the plurality of frequency bands comprises a plurality of cellular frequency bands, wherein the given frequency band comprises a Wi-Fi frequency band, and wherein the control circuitry is to determine whether communications in the selected frequency band interfere with communications in the given frequency band comprises to: determining whether the selected frequency band is adjacent to the Wi-Fi frequency band.

According to another embodiment, the plurality of frequency bands comprises a plurality of cellular frequency bands, wherein the given frequency band comprises a bluetooth frequency band, and wherein the control circuit determining whether communications in the selected frequency band interfere with communications in the given frequency band comprises: it is determined whether the selected band is adjacent to the bluetooth band.

The foregoing merely illustrates the principles of the invention and various modifications can be made by those skilled in the art without departing from the scope and spirit of the invention.

This application claims priority to U.S. patent application No.13/631,483 filed on 28/9/2012 and U.S. provisional patent application No.61/569,641 filed on 12/2011, both of which are incorporated herein by reference in their entirety.

Claims (33)

1. A method of operating a wireless electronic device, the method comprising:

selecting, using a control circuit, a first antenna of a first antenna and a second antenna for radio frequency transmission in a first frequency band, wherein the first frequency band is susceptible to intermodulation interference from a second frequency band; and

in response to selecting the first antenna for radio frequency transmission in the first frequency band, canceling intermodulation interference in the first frequency band using a switching circuit by selecting a second antenna located at an opposite end of the wireless electronic device relative to the first antenna and routing radio frequency transmit signals in the second frequency band to only the selected second antenna.

2. The method of claim 1, further comprising:

selecting, using the control circuitry, the second antenna for radio frequency transmission in the first frequency band; and

canceling intermodulation interference in a first frequency band by routing radio frequency transmit signals in the second frequency band to only the first antenna using the switching circuitry in response to selecting the second antenna for radio frequency transmission in the first frequency band using the control circuitry.

3. The method of claim 2, further comprising:

routing radio frequency transmit signals in the first frequency band to the first antenna using the switching circuit in response to selecting the first antenna using the control circuit.

4. The method of claim 3, further comprising:

routing radio frequency transmit signals in the first frequency band to the second antenna using the switching circuit in response to selecting the second antenna using the control circuit.

5. The method of claim 4, further comprising:

providing radio frequency signals in the first frequency band to the switching circuit using a first transceiver; and

providing radio frequency signals in the second frequency band to the switching circuit using a second transceiver.

6. The method of claim 2, wherein the first frequency band comprises a Wi-Fi frequency band, wherein the second frequency band comprises a Long Term Evolution (LTE) frequency band, and wherein the switching circuitry is interposed between the first and second antennas and first and second transceivers, the method further comprising:

configuring, using the control circuitry, the switching circuitry in a first configuration in which the first antenna is coupled to the first transceiver and the second antenna is coupled to the second transceiver in response to selecting the first antenna for radio frequency transmission in the first frequency band; and

configuring, using the control circuitry, the switching circuitry in a second configuration in which the first antenna is coupled to the second transceiver and the second antenna is coupled to the first transceiver in response to selecting the second antenna for radio frequency transmission in the first frequency band.

7. The method of claim 2, wherein the control circuitry comprises a baseband processor, and wherein selecting a given antenna of first and second antennas for radio frequency transmission in the first frequency band comprises:

selecting, using the baseband processor, the given one of a first antenna and a second antenna for radio frequency transmission in the first frequency band.

8. An electronic device, comprising:

a conductive rectangular housing at an exterior surface of the electronic device, wherein the conductive rectangular housing has opposing first and second ends, a first portion at the first end, and a second portion at the second end;

a first antenna and a second antenna, wherein the first antenna is formed at least in part by the first portion and the second antenna is formed at least in part by the second portion;

a first transceiver and a second transceiver, wherein the first transceiver is configured to generate radio frequency signals in a selected frequency band of a plurality of frequency bands;

switching circuitry operable in a first configuration in which the first transceiver is coupled to the first antenna and the second transceiver is coupled to the second antenna, and further operable in a second configuration in which the first transceiver is coupled to the second antenna and the second transceiver is coupled to the first antenna; and

a control circuit that controls which of the first configuration and the second configuration the switching circuit uses in response to the selected frequency band being routed to one of the first antenna and the second antenna.

9. The electronic device of claim 8, wherein the first antenna is located at a first end of the electronic device, and wherein the second antenna is located at a second end of the electronic device.

10. The electronic device of claim 8, wherein the first transceiver comprises a cellular transceiver.

11. The electronic device of claim 10, wherein the second transceiver comprises a Wi-Fi transceiver.

12. The electronic device of claim 10, wherein the cellular transceiver comprises a long term evolution transceiver.

13. A method of operating wireless communication circuitry in an electronic device, wherein the wireless communication circuitry includes a first transceiver to communicate using a plurality of frequency bands and a second transceiver to communicate using a Wi-Fi frequency band, the method comprising:

selecting a frequency band between 2.5GHz and 2.57GHz from the plurality of frequency bands for communication using the first transceiver;

selecting one antenna from one of the first antenna and the second antenna for communication in the selected frequency band;

determining whether communications in the selected frequency band using the first transceiver interfere with communications in the Wi-Fi frequency band; and

in response to determining that the communication in the selected frequency band interferes with the communication in the Wi-Fi frequency band, performing time division multiplexing between the communication in the selected frequency band and the communication in the Wi-Fi frequency band using a switching circuit on a selected antenna.

14. The method of claim 13, wherein the first transceiver comprises a cellular transceiver, and wherein the second transceiver comprises a Wi-Fi transceiver, the method further comprising:

transmitting radio frequency signals in an LTE band 7 frequency band using the cellular transceiver; and

transmitting radio frequency signals in the Wi-Fi frequency band using the Wi-Fi transceiver.

15. The method of claim 14, wherein the first antenna and the second antenna are formed at opposite ends of the electronic device, the method further comprising:

routing radio frequency signals transmitted in the LTE band 7 band to a first antenna using a switching circuit; and

canceling, using the switching circuitry, intermodulation interference in LTE band 7 band by routing radio frequency signals transmitted in the Wi-Fi band to a second antenna.

16. A method of operating a wireless electronic device having a first transceiver that communicates using a plurality of cellular telephone frequency bands and a second transceiver that communicates using a given frequency band, the method comprising:

selecting a cellular telephone frequency band from the plurality of frequency bands that is different from the given frequency band for communication using the first transceiver;

selecting an antenna from the first antenna and the second antenna for communication in the selected cellular telephone band;

determining whether communications in the selected cellular telephone frequency band interfere with communications in the given frequency band; and

performing time division multiplexing between communications in the selected cellular telephone frequency band and communications in the given frequency band using a switching circuit in response to determining that communications in the selected cellular telephone frequency band interfere with communications in the given frequency band, wherein performing time division multiplexing between communications in the selected cellular telephone frequency band and communications in the given frequency band using the switching circuit comprises:

routing communications in the selected cellular telephone frequency band between the first transceiver and the selected antenna using a switching circuit during a first time period; and

routing communications in the given frequency band between the second transceiver and the selected antenna using the switching circuit during a second time period subsequent to the first time period.

17. The method of claim 16, wherein the first transceiver comprises a long term evolution cellular transceiver, and wherein the second transceiver comprises a Wi-Fi transceiver, the method further comprising:

transmitting radio frequency signals in the selected cellular telephone band using the long term evolution cellular transceiver; and

transmitting radio frequency signals in the given frequency band using the second transceiver.

18. The method of claim 16, wherein the plurality of frequency bands comprises a plurality of cellular frequency bands, wherein the given frequency band comprises a Wi-Fi frequency band, and wherein determining whether communications in the selected cellular telephone frequency band interfere with communications in the given frequency band comprises:

determining whether an LTE band is adjacent to the Wi-Fi band.

19. The method of claim 16, wherein the plurality of frequency bands comprises a plurality of cellular frequency bands, wherein the given frequency band comprises a bluetooth frequency band, and wherein determining whether communications in the selected cellular telephone frequency band interfere with communications in the given frequency band comprises:

it is determined whether the selected cellular telephone band is adjacent to the bluetooth band.

20. A wireless electronic device, the wireless electronic device comprising:

at least a first antenna and a second antenna located at opposite ends of the wireless electronic device;

a control circuit configured to select a first antenna of the first and second antennas for radio frequency transmission in a first frequency band, wherein the first frequency band is susceptible to intermodulation interference from a second frequency band; and

switching circuitry configured to cancel intermodulation interference in a first frequency band by selecting a second antenna at an opposite end of the wireless electronic device from the first antenna and to route radio frequency transmit signals in the second frequency band to only the selected second antenna in response to the control circuitry selecting the first antenna for radio frequency transmission in the first frequency band.

21. The wireless electronic device of claim 20, wherein:

the control circuit selects the second antenna for radio frequency transmission in the first frequency band; and

in response to the control circuit selecting the second antenna for radio frequency transmission in the first frequency band, the switching circuit cancels intermodulation interference in the first frequency band and routes radio frequency transmit signals in the second frequency band to only the first antenna.

22. The wireless electronic device of claim 21, wherein:

the switching circuit routes radio frequency transmit signals in the first frequency band to the first antenna in response to the control circuit selecting the first antenna.

23. The wireless electronic device of claim 20, wherein:

the switching circuit routes radio frequency transmit signals in the first frequency band to the second antenna in response to the control circuit selecting the second antenna.

24. The wireless electronic device of claim 23, further comprising:

a first transceiver configured to provide radio frequency signals in the first frequency band to the switching circuit;

a second transceiver configured to provide radio frequency signals in the second frequency band to the switching circuit.

25. The wireless electronic device of claim 21, wherein the first frequency band comprises a Wi-Fi frequency band, wherein the second frequency band comprises a Long Term Evolution (LTE) frequency band, and wherein the switching circuitry is interposed between the first and second antennas and first and second transceivers, wherein:

in response to selecting the first antenna for radio frequency transmission in the first frequency band, the control circuitry configures the switching circuitry in a first configuration in which the first antenna is coupled to the first transceiver and the second antenna is coupled to the second transceiver; and

in response to selecting the second antenna for radio frequency transmission in the first frequency band, the control circuitry configures the switching circuitry in a second configuration in which the first antenna is coupled to the second transceiver and the second antenna is coupled to the first transceiver.

26. The wireless electronic device defined in claim 21 wherein the control circuitry comprises a baseband processor and wherein selecting a given antenna of first and second antennas for radio frequency transmission in the first frequency band comprises:

the baseband processor selects the given one of the first and second antennas for radio frequency transmission in the first frequency band.

27. A wireless communications circuit, comprising:

a first antenna and a second antenna;

a first transceiver to communicate using a plurality of frequency bands;

a second transceiver to communicate using a Wi-Fi frequency band;

a control circuit configured to:

selecting a frequency band between 2.5GHz and 2.57GHz from the plurality of frequency bands for communication using the first transceiver,

selecting one antenna from the first antenna and the second antenna for communication in the selected frequency band,

determining whether communications in the selected frequency band using the first transceiver interfere with communications in the Wi-Fi frequency band; and

a switching circuit configured to perform time division multiplexing between communications in the selected frequency band and communications in the Wi-Fi frequency band on the selected antenna in response to the control circuit determining that communications in the selected frequency band interfere with communications in the Wi-Fi frequency band.

28. The wireless communications circuitry defined in claim 27, wherein the first transceiver comprises a cellular transceiver and wherein the second transceiver comprises a Wi-Fi transceiver, wherein:

the cellular transceiver transmits radio frequency signals in LTE band 7, and,

the Wi-Fi transceiver transmits radio frequency signals in the Wi-Fi frequency band.

29. The wireless communication circuitry of claim 28, wherein the switching circuitry routes communications from the first transceiver and the second transceiver to a counter antenna by:

routing radio frequency signals transmitted in the LTE band 7 band to a first antenna; and

intermodulation interference in the LTE band 7 is cancelled by routing radio frequency signals transmitted in the Wi-Fi band to the second antenna.

30. A wireless electronic device, comprising:

a first antenna and a second antenna;

a first transceiver for communicating using a plurality of cellular telephone frequency bands;

a second transceiver for communicating using a given frequency band;

a control circuit configured to:

selecting a cellular telephone band from the plurality of cellular telephone bands for communication using the first transceiver,

selecting an antenna from the first antenna and the second antenna for communication in the selected cellular telephone band,

determining whether communications in the selected cellular telephone frequency band interfere with communications in the given frequency band; and

a switching circuit configured to perform time division multiplexing between communications in the selected cellular telephone frequency band and communications in the given frequency band in response to determining that communications in the selected cellular telephone frequency band interfere with communications in the given frequency band, wherein the switching circuit performing time division multiplexing between communications in the selected cellular telephone frequency band and communications in the given frequency band comprises:

the switching circuit routing communications in the selected cellular telephone frequency band between the first transceiver and the selected antenna during a first time period; and

the switching circuit routes communications in the given frequency band between the second transceiver and the selected antenna during a second time period after the first time period.

31. The wireless electronic device of claim 30, wherein the first transceiver comprises a long term evolution cellular transceiver, and wherein the second transceiver comprises a Wi-Fi transceiver, wherein:

the long term evolution cellular transceiver transmitting radio frequency signals in the selected cellular telephone frequency band; and is

The second transceiver transmits radio frequency signals in the given frequency band.

32. The wireless electronic device defined in claim 30 wherein the plurality of frequency bands comprises a plurality of cellular frequency bands, wherein the given frequency band comprises a Wi-Fi frequency band, and wherein the control circuitry to determine whether communications in the selected cellular telephone frequency band interfere with communications in the given frequency band comprises:

determining whether an LTE band is adjacent to the Wi-Fi band.

33. The wireless electronic device defined in claim 30 wherein the plurality of frequency bands comprises a plurality of cellular frequency bands, wherein the given frequency band comprises a bluetooth frequency band, and wherein the control circuitry to determine whether communications in the selected cellular telephone frequency band interfere with communications in the given frequency band comprises:

it is determined whether the selected cellular telephone band is adjacent to the bluetooth band.