CN106159446A - Radio frequency device and wireless communication device - Google Patents

Abstract

A radio frequency device and a wireless communication device are provided. The radio frequency device comprises an antenna setting area, a grounding component, a first antenna, a second antenna, a third antenna and a second parasitic component; the first antenna comprises a metal coupling sheet, a first radiator, a first signal feed-in component and a first parasitic component; the first parasitic element is electrically connected to the grounding element and is used for guiding a second reflection signal generated by the second antenna and a third reflection signal generated by the third antenna to the first parasitic element so as to improve the isolation between the first antenna and the second and third antennas. The invention can improve the isolation among a plurality of antennas in a limited space, thereby increasing the efficiency of the antennas and ensuring the normal operation of wireless transmission.

Description

Radio Frequency Devices and Wireless Communication Devices

technical field

The present invention relates to a radio frequency device and a wireless communication device, in particular to a radio frequency device and a wireless communication device that can improve isolation to place multiple antennas in a limited space while maintaining antenna performance and bandwidth.

Background technique

Electronic products with wireless communication functions, such as notebook computers, personal digital assistants (Personal Digital Assistant), wireless base stations, mobile phones, smart meters (Smart Meter), USB wireless network cards (USB dongle), etc., transmit or receive through antennas Radio waves to pass or exchange radio signals to access wireless networks. Therefore, in order to allow users to access wireless communication networks more conveniently, the bandwidth of an ideal antenna should be increased as much as possible within the allowable range, while the size should be reduced as much as possible to match the trend of shrinking electronic products. In addition, with the continuous evolution of wireless communication technology, the number of antennas configured on electronic products may increase. For example, in the design of USB wireless network cards, in order to allow users of related electronic products to simultaneously use different wireless communication systems (such as Bluetooth and WiFi) in the same frequency band to execute different applications, or to improve the spectral efficiency of wireless communication systems and transmission rate to improve communication quality, the USB wireless network card needs to use multiple (or multiple) antennas to send and receive wireless signals synchronously, divide the space into many channels, and then provide multiple antenna patterns. Due to the use of multiple groups of antennas, the problem of mutual interference between antennas has become one of the key points to be considered during design.

In the design of wireless communication products, multiple groups of antennas are usually placed on the diagonal line of the wireless communication product or at the farthest position on the longest side to minimize the interference between multiple groups of antennas and achieve Best complementary antenna characteristics. However, when the overall size of the wireless communication product or the area where the antennas can be installed is small, it is necessary to consider the layout of multiple sets of antennas at the same time to avoid mutual interference between the antennas, thus increasing design difficulties.

In addition, with the technological advancement of wireless communication systems, broadband antennas have become one of the primary requirements of communication systems. Common broadband antennas, such as planar inverted F antennas, can achieve the purpose of transmitting and receiving multi-frequency wireless signals, however, the length of the radiator of this type of antenna is too long to be installed in a miniaturized wireless communication system, and the low-frequency bandwidth Insufficient (about 110MHz), unable to meet the needs of broadband communication systems.

Therefore, how to design multiple sets of antennas that meet the transmission requirements in a limited space while taking into account the bandwidth, efficiency, and isolation of each antenna has become one of the goals that the industry is striving for.

Therefore, it is necessary to provide a radio frequency device and a wireless communication device to meet the above requirements.

Contents of the invention

The present invention mainly provides a radio frequency device and a wireless communication device capable of improving antenna isolation, so as to place multiple antennas in a limited space and maintain antenna bandwidth and performance.

The invention discloses a radio frequency device, the radio frequency device is used for a wireless communication device, and the radio frequency device includes: an antenna setting area, a grounding component, a first antenna, a second antenna, a third antenna and a second The parasitic component; the grounding component is used to provide grounding; the first antenna is arranged in the antenna setting area for sending and receiving a first wireless signal, and the first antenna includes: a metal coupling sheet; a first radiator, the The first radiator is electrically connected to the grounding component for transmitting the first wireless signal; a first signal feeding component is electrically connected to the metal coupling plate and used for the first signal feeding component. A wireless signal is coupled to the first radiator through the metal coupling plate, so as to transmit the first wireless signal through the first radiator; and a first parasitic component, the first parasitic component is electrically connected to the ground component; The second antenna is set in the antenna setting area for sending and receiving a second wireless signal; the third antenna is set in the antenna setting area for sending and receiving a third wireless signal; the second parasitic component is set in the In the antenna setting area, it is electrically connected to the grounding component, and is used to guide a first reflected signal of the first wireless signal to the second parasitic component, so as to enhance the first antenna and the second and third antennas The isolation degree; wherein, the ground component is located between the first antenna and the second parasitic component, the second and third antennas, the first, second and third antennas share the ground component, and the metal coupling plate roughly located between the first parasitic component and the first radiator, the first parasitic component is used to guide a second reflected signal of the second wireless signal and a third reflected signal of the third wireless signal to the on the first parasitic component to improve the isolation between the first antenna and the second and third antennas.

The present invention also discloses a wireless communication device, the wireless communication device includes: a system grounding element, the system grounding element is used to provide grounding; a radio frequency signal processing module, the radio frequency signal processing module is used to process a plurality of wireless signals; and A radio frequency device, the radio frequency device includes: an antenna setting area, a ground component, a first antenna, a second antenna, a third antenna and a second parasitic component; the ground component is used to provide grounding; the first The antenna is set in the antenna setting area, and is used to send and receive a first wireless signal of the plurality of wireless signals. The first antenna includes: a metal coupling sheet; a first radiator, and the first radiator is electrically connected to the The grounding component is used to transmit the first wireless signal; a first signal feed-in component, the first signal feed-in component is electrically connected to the metal coupling plate, and is used for passing the first wireless signal through the metal coupling plate coupled to the first radiator to transmit the first wireless signal through the first radiator; and a first parasitic component, the first parasitic component is electrically connected to the ground component; the second antenna is arranged on the antenna In the setting area, a second wireless signal used to send and receive the plurality of wireless signals; the third antenna is set in the antenna setting area, used to send and receive a third wireless signal of the plurality of wireless signals; the second parasitic The component is arranged in the antenna setting area, electrically connected to the ground component, and used to guide a first reflected signal of the first wireless signal to the second parasitic component, so as to enhance the first antenna and the second parasitic component. and the isolation of the third antenna; wherein the ground component is located between the first antenna and the second parasitic component, the second and third antennas, and the first, second and third antennas share the ground component, The metal coupling sheet is roughly located between the first parasitic component and the first radiator, and the first parasitic component is used to guide a second reflected signal of the second wireless signal and a third reflected signal of the third wireless signal. The signal is reflected to the first parasitic component to improve the isolation between the first antenna and the second and third antennas.

The present invention uses the first parasitic component and the second parasitic component to guide the reflected signal of the antenna without disturbing the main radiator, so as to improve the isolation between multiple antennas in a limited space, thereby increasing the antenna efficiency and ensuring wireless normal operation of the transmission.

Description of drawings

FIG. 1 is a schematic diagram of a wireless communication device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a radio frequency device according to an embodiment of the present invention.

FIG. 3A is a schematic diagram of low-frequency current distribution of the radio frequency device in FIG. 2 .

FIG. 3B is a schematic diagram of high-frequency current distribution of the radio frequency device in FIG. 2 .

4A to 4C are schematic diagrams of VSWR of the radio frequency device in FIG. 2 .

5A to 5B are schematic diagrams of antenna isolation of the radio frequency device shown in FIG. 2 .

FIG. 6 is a schematic diagram of a radio frequency device according to an embodiment of the present invention.

FIG. 7A is a schematic diagram of low-frequency current distribution of the radio frequency device in FIG. 6 .

FIG. 7B is a schematic diagram of high frequency current distribution of the radio frequency device in FIG. 6 .

FIG. 8 is a schematic diagram of a radio frequency device according to an embodiment of the present invention.

FIG. 9A is a schematic diagram of low-frequency current distribution of the radio frequency device in FIG. 8 .

FIG. 9B is a schematic diagram of high frequency current distribution of the radio frequency device in FIG. 8 .

Description of main component symbols:

10 wireless communication device

100 RF devices

102 RF signal processing module

20, 60, 80 RF devices

200, 210, 220, 600, 610, 620, 800, antenna

810, 820

230, 630, 830 Grounding Assembly

250, 650, 850 antenna setting area

202, 240, 602, 640, 802, 812 Parasitic components

204, 212, 214, 222, 224, 612, 614, radiator

622, 624, 814, 822, 824, 604, 804

206, 606, 806 Metal coupling

216, 226, 616, 626, 816, 826 Short circuit assembly

208, 218, 228, 608, 618, 628, 808, signal feed-in components

818, 828

201, 601, 801, 811 Slots

L202, L204, L240, L640, L804, Length

L812

D1, D2, D3, D4, D5, D6, D7, current path

D8, D9, D10, D11, D12, D13,

D14, D15

h1, h2 spacing

X, Y, Z axis

641 Arm

detailed description

Please refer to FIG. 1 , which is a schematic diagram of a wireless communication device 10 according to an embodiment of the present invention. The wireless communication device 10 can be any electronic product with a wireless communication function, such as a mobile phone, a computer system, a wireless access point device, a wireless base station, a USB wireless network card, etc., and it is briefly composed of a radio frequency device 100 and a radio frequency signal processing module Composed of 102. The radio frequency device 100 provides a wireless communication function of the wireless communication device 10. To be more precise, the radio frequency signal processing module 102 can support simultaneous transmission and reception of multiple wireless signals of the same frequency band, and the radio frequency device 100 can ensure isolation under this operation. The so-called "simultaneous transmission and reception of multiple wireless signals of the same frequency band" can be a wireless communication system that supports multiple input and multiple output communication technology to simultaneously transmit and receive wireless signals, or different wireless communication systems (such as Bluetooth and Wi-Fi) that use the same frequency band simultaneously Send and receive wireless signals.

Please refer to FIG. 2 , which is a schematic diagram of a radio frequency device 20 according to an embodiment of the present invention. The radio frequency device 20 can be applied to the radio frequency device 100 in FIG. 1, and includes a first antenna 200, a second antenna 210, a third antenna 220, a grounding component 230, a second parasitic component 240 and an antenna installation area 250. The first antenna 200 , the second antenna 210 and the third antenna 220 are disposed in the antenna installation area 250 and are used for transmitting and receiving a plurality of first to third wireless signals of the same frequency band respectively. For example, the first antenna 200 can be used to send and receive the first wireless signal of the Bluetooth communication system, and the second antenna 210 and the third antenna 220 can be used to send and receive the second and third wireless signals of the WiFi communication system. The first antenna 200 , the second antenna 210 and the third antenna 220 are disposed on the same substrate and share the ground component 230 to connect to a system ground of the wireless communication device 10 . The RF signal processing module 102 (not shown in FIG. 2 ) is arranged in the center of the antenna installation area 250, the first antenna 200 is arranged at one end of the antenna installation area 250, the second antenna 210, the third antenna 220 and the second parasitic component 240 are arranged at the other end of the antenna setting area 250 .

The first antenna 200 includes a first parasitic element 202 , a first radiator 204 , a metal coupling piece 206 and a signal feeding element 208 . The signal feed-in component 208 is electrically connected to the metal coupling plate 206 for coupling the wireless signal to the first radiator 204 through the metal coupling plate 206 . The first radiator 204 is disposed on one side of the metal coupling plate 206, is electrically connected to the grounding component 230, and is coupled to the metal coupling plate 206, that is, it can generate a signal connection with the metal coupling plate 206 by coupling to receive signals from the metal coupling plate 206. The metal coupling sheet 206 feeds in the first wireless signal, and then transmits the first wireless signal. With respect to the first radiator 204, the first parasitic element 202 is disposed on the other side of the metal coupling plate 206, and the first parasitic element 202 is electrically connected to the ground element 230 for connecting the second antenna 210 and the third antenna 220 The generated reflected signals of the second and third wireless signals are guided to the first parasitic component 202 without disturbing the first radiator 204 of the first antenna 200, so as to improve the isolation between the antennas 200, 210, 220, This results in good antenna efficiency. The length L204 of the first radiator 204 and the length L202 of the first parasitic element 202 are roughly a quarter wavelength of an operating frequency, but they do not need to be equal in length.

The ground component 230 is formed with a slot 201 , the slot 201 is located between the first signal feed component 208 and the first radiator 204 , so that the low frequency current generated by the first antenna 200 passes from the signal feed component 208 along the periphery of the slot 204 flow to the first radiator 204. Therefore, the length and area of the slot 201 will affect the length of the current path generated by the first antenna 200 , so adjusting the length and area of the slot 201 can adjust the working frequency of the first antenna 200 . In another embodiment, if the length of the current path generated by the first antenna 200 meets the application requirement without the slot 201 , the slot 201 can be omitted.

The second antenna 210 includes a second radiator 212 , a third radiator 214 , a short circuit element 216 and a signal feeding element 218 . The third radiator 214 is electrically connected to the ground component 230 . The signal feeding component 218 is electrically connected to the second radiator 212 for transmitting the second wireless signal to the second radiator 212 so as to transmit the second wireless signal through the second radiator 212 . The short circuit element 216 is electrically connected to the second radiator 212 , the ground element 230 and the second parasitic element 240 .

The third antenna 220 includes a fourth radiator 222 , a fifth radiator 224 , a short circuit component 226 and a signal feeding component 228 . The fifth radiator 224 is electrically connected to the ground component 230 . The signal feed-in component 218 is electrically connected to the fourth radiator 222 for transmitting the third wireless signal to the fourth radiator 222 so as to transmit the third wireless signal through the fourth radiator 222 . The short circuit element 226 is electrically connected to the fourth radiator 222 , the ground element 230 and the second parasitic element 240 .

The antenna forms of the second and third antennas 210, 220 are similar to planar inverted-F antennas with a lower point (short-circuit elements 216, 226), but not limited thereto, and other types of antennas also have similar effects. The second radiator 212 and the fourth radiator 222 are used to excite lower frequency modes, while the third radiator 214 and fifth radiator 224 are used to excite higher frequency modes.

The second parasitic component 240 is disposed in the antenna installation area 250 and is electrically connected to the ground component 230 for guiding the reflected signal of the first wireless signal 200 to the second parasitic component 240 without disturbing the second and third antennas. The second and fourth radiators 212 and 222 of 210 and 220 are used to improve the isolation between the first antenna 200 and the second antenna 210 and the third antenna 220 . A length L240 of the second parasitic element 240 is approximately a quarter wavelength of a working frequency.

Therefore, the first parasitic component 202 and the second parasitic component 240 can respectively guide the reflected signals of the second, third and first wireless signals, so that the reflected signals do not interfere with the main radiators of the antennas 200, 210 and 220 (ie, the first , third and fifth radiators 204 , 212 and 222 ), so as to improve the isolation between the antennas 200 , 210 , and 220 .

Please refer to FIG. 3A and FIG. 3B , which respectively illustrate low-frequency and high-frequency current distribution diagrams when the first antenna 200 , the second antenna 210 and the third antenna 220 operate simultaneously. As shown in FIG. 3A , for the first antenna 200 , the shortest path for the low-frequency current path D1 from the signal feed-in component 208 to the end of the first radiator 204 is from the first signal feed-in component 208 along the periphery of the slot 201 flow to the first radiator 204. Compared with the second antenna 210 and the third antenna 220, the shortest path for part of the reflected current to reach the end of the first radiator 204 is from the connection between the ground component 230 and the first radiator 204 to the first radiator 204 end. Therefore, the current paths D1 observed by the first antenna 200, the second antenna 210, and the third antenna 220 at the same first radiator 204 are different, so the first antenna 200 and the second and third antennas 210, 220 can be improved. the isolation between.

In addition, since the second antenna 210 is opposite to the third antenna 220, the second and third wireless signals are transmitted on the second and third antennas 210, 220 (such as the second and fourth radiators 212, 222) respectively. The directions of the generated current paths D2 and D3 are opposite, so there is good antenna isolation between the second antenna 210 and the third antenna 220 .

As shown in FIG. 3B , in the same way, since the second antenna 210 and the third antenna 220 are arranged oppositely, the second and third wireless signals are transmitted on the second and third antennas 210 and 220 respectively (such as the third and fifth radiations). The directions of the current paths D4 and D5 generated on the bodies 214 and 224 are opposite, so there is good antenna isolation between the second antenna 210 and the third antenna 220 .

Further, FIG. 4A is a schematic diagram of the voltage standing wave ratio (Voltage Standing Wave Ratio, VSWR) of the first antenna 200, FIG. 4B is a schematic diagram of the voltage standing wave ratio of the second antenna 210, and FIG. 4C is a voltage standing wave ratio of the third antenna 220 Compared with the schematic diagrams, FIG. 5A is a schematic diagram of antenna isolation between the first antenna 200 and the second antenna 210 , and FIG. 5B is a schematic diagram of antenna isolation between the first antenna 200 and the third antenna 220 . As shown in FIG. 4A to FIG. 5B , the first antenna 200 , the second antenna 210 and the third antenna 220 have good bandwidth, and the isolation between the antennas can be lower than -30dB at the low frequency of 2.4GHz to 2.5GHz.

It should be noted that the present invention guides the reflected current of the first antenna 200 to the second parasitic component 240 without interfering with the second and fourth radiators 212, 222 of the second and third antennas 210, 220. The reflected currents of the second and third antennas 210, 220 are guided to the first parasitic component 202 of the first antenna 200 without disturbing the first radiator 204, and the current path D1 of the first antenna 200 is adjusted by using the slot 201, so as to To ensure that the antenna has good bandwidth, efficiency, and isolation, those skilled in the art should be able to make different modifications accordingly, without being limited thereto. For example, the wireless signal generated by the first antenna 200 is fed into the first radiator 204 through the metal coupling plate 206 in a coupling manner, and the coupling distance h1 and h2 can be adjusted appropriately, but is not limited thereto. The first antenna 200 can also be properly modified so that the wireless signal can be fed into the first radiator 204 in other feeding ways. In addition, the first parasitic component 202, the first radiator 204, the metal coupling plate 206, the second radiator 212, the third radiator 214, the fourth radiator 222, the fifth radiator 224, etc. can be selected according to different design requirements. The X, Y, and Z axes extend or change, and are not limited to the shapes in FIG. 1 . The short-circuit components 216, 226 are used to connect the radiators 212, 222 and the ground component 230 to adjust the impedance matching of the antenna. Therefore, the form of the short-circuit components 216, 226 can be appropriately adjusted according to the overall matching and bandwidth of the antenna, and there is no limit to its shape. . Furthermore, the substrate used for disposing the radio frequency device 20 may be a printed circuit board (Printed Circuit Board, PCB), or may be a substrate of other materials.

Please refer to FIG. 6 , which is a schematic diagram of a radio frequency device 60 according to another embodiment of the present invention. The placement directions of the radio frequency device 60 and the radio frequency device 20 are different, the radio frequency device 20 is disposed on the X-Y plane, and the radio frequency device 60 is disposed on the X-Z plane. The antenna setting area 650 is provided with a first antenna 600 , a second antenna 610 , a third antenna 620 and a second parasitic component 640 . The first antenna 600 includes a first parasitic element 602 , a first radiator 604 , a metal coupling piece 606 and a signal feeding element 608 . The second antenna 610 includes a second radiator 612 , a third radiator 614 , a short circuit component 616 and a signal feeding component 618 . The third antenna 620 includes a fourth radiator 622 , a fifth radiator 624 , a short circuit component 626 and a signal feeding component 628 .

The first antenna 600 is similar to the antenna 200, the main difference lies in the shape and width of the first parasitic element 602 and the first radiator. The first parasitic element 602 can also guide the reflected currents of the second and third antennas 610 and 620 to the first parasitic element 602 without disturbing the first radiator 604 to ensure good bandwidth, efficiency and isolation of the antenna. The ground component 630 is formed with a slot 601, the slot 601 is located between the first signal feed component 608 and the first radiator 604, so that the low-frequency current generated by the first antenna 600 passes from the signal feed component 608 along the periphery of the slot 601 flow to the first radiator 204. In another embodiment, if the length of the current path generated by the first antenna 600 meets the application requirement without the slot 601 , the slot 601 can be omitted.

The second and third antennas 210, 220 are arranged oppositely (or symmetrically), while the second and third antennas 610, 620 are arranged vertically, so as to match the difference in installation environments. The difference between the second antenna 610 and 210 is that the second radiator 612 surrounds the short circuit element 616 . The difference between the third antennas 620 and 220 is that the short circuit component 626 is electrically connected between the fourth radiator 622 and the ground component 630 . The second radiator 612 extends approximately along the Z axis, the fourth radiator 622 approximately extends along the -X axis, and both are perpendicular to each other; the third radiator 614 and the fifth radiator 624 approximately extend along the -X axis, and both are parallel to each other.

The second parasitic element 640 is electrically connected to the ground element 630, and is disposed between the second and third antennas 610, 620, and is used to guide the reflected signal of the first antenna 600 to the second parasitic element 640 without disturbing the second antenna 640. The radiator 212 and the fourth radiator 622 ensure that the antenna has good bandwidth, efficiency and isolation. A length L640 of the second parasitic element 640 is approximately a quarter wavelength of an operating frequency. The second parasitic component 640 includes an arm 641 disposed at the end of the second radiator 612 for coupling the second radiator 612 to establish a signal connection.

Please refer to FIG. 7A and FIG. 7B , which respectively illustrate low-frequency and high-frequency current distribution diagrams when the first antenna 600 , the second antenna 610 and the third antenna 620 operate simultaneously. As shown in FIG. 7A , for the first antenna 600 , the current path D6 observed by the first radiator 604 needs to pass around the slot 601 and then reach the end of the first radiator 604 . Compared with the second antenna 610 and the third antenna 620 , the current path D6 observed by the first radiator 604 directly reaches the end of the first radiator 604 without passing around the slot 601 . Therefore, the isolation between the first antenna 600 and the second and third antennas 610 and 620 can be improved.

In addition, since the second antenna 610 and the third antenna 620 are arranged vertically (or orthogonally), the second and third wireless signals are transmitted on the second and third antennas 610 and 620 respectively (such as the second and fourth radiators 612 , 622) The current paths D7, D8 generated are vertical, so there is good antenna isolation between the second antenna 610 and the third antenna 620.

As shown in FIG. 7B, although the directions of the current paths D9 and D10 generated by the second and third wireless signals on the second and third antennas 610 and 620 (such as the third and fifth radiators 614 and 624) are the same , but the second and third antennas 610 and 620 belong to the same wireless communication technology, and the restriction on isolation is relatively low, so the antenna isolation between the second antenna 610 and the third antenna 620 can meet the application specification.

In addition, the first radiator 604 of the first antenna 600 is used to excite lower frequency modes, and the metal coupling plate 606 can also be used as a high frequency radiator to excite higher frequency modes depending on the application. The short circuit component 616 is connected to the signal feed component 618 of the second antenna 810 and the ground component 630 to adjust the antenna impedance matching; the short circuit component 626 is connected to the fourth radiator 622 of the second antenna 810 and the ground component 630 to adjust the antenna impedance Therefore, the form of the short-circuit components 616 and 626 can be appropriately adjusted depending on the overall matching and bandwidth of the antenna, and the shape is not limited. In addition to the above, related modifications and changes of the radio frequency device 20 can be applied to the radio frequency device 60 without limitation.

Please refer to FIG. 8 , which is a schematic diagram of a radio frequency device 80 according to another embodiment of the present invention. The placement environment of the radio frequency device 80 is different from that of the radio frequency device 60 , and the distance from the metal in the environment is three millimeters and ten millimeters (Y axis) respectively. The antenna setting area 850 is provided with a first antenna 800 , a second antenna 810 and a third antenna 820 . The first antenna 800 includes a first parasitic element 802 , a first radiator 804 , a metal coupling piece 806 and a signal feeding element 808 . The second antenna 810 includes a second parasitic element (also a second radiator) 812 , a third radiator 814 , a short circuit element 816 and a signal feeding element 818 . The third antenna 820 includes a fourth radiator 822 , a fifth radiator 824 , a short circuit component 826 and a signal feeding component 828 .

It should be noted that, in addition to being used for transmitting wireless signals, the second parasitic component 812 can also be used to guide the reflected signal of the first antenna 800 without disturbing the fourth radiator 822, so as to improve the performance of the first and third antennas 800, 820. isolation. In addition, a length L804 of the first radiator 804 and a length L812 of the second parasitic element 812 are approximately a quarter wavelength of an operating frequency, but they do not need to be equal in length.

The first antenna 800 is similar to the first antenna 200 , the main difference lies in the position and area of the slot 801 and the shape of the metal coupling piece 806 . The first parasitic element 802 can also guide the reflected currents of the second and third antennas 810 and 820 to the first parasitic element 802 without disturbing the first radiator 804 to ensure good bandwidth, efficiency and isolation of the antenna. The second and third antennas 210, 220 are opposite (or symmetrical).

The ground component 830 is formed with a triangular slot 811, the slot 811 is located between the second antenna 810 and the third antenna 820, and is used to isolate the currents generated by the second and third antennas 810, 820 respectively, so as to enhance the second And the isolation of the third antenna 810, 820. In another embodiment, the slot 811 can also be omitted.

Please refer to FIG. 9A and FIG. 9B , which respectively illustrate low-frequency and high-frequency current distribution diagrams when the first antenna 800 , the second antenna 810 and the third antenna 820 operate simultaneously. As shown in FIG. 9A , for the first antenna 800 , the current path D11 observed by the first radiator 804 needs to pass around the slot 801 and then reach the end of the first radiator 804 . Compared with the second antenna 810 and the third antenna 820 , the current path D11 observed by the first radiator 804 directly reaches the end of the first radiator 804 without passing around the slot 801 . Therefore, the isolation between the first antenna 800 and the second and third antennas 810 and 820 can be improved.

In addition, since the second antenna 810 is opposite to the third antenna 820 (toward the X-axis and -X-axis respectively), the second and third wireless signals are transmitted on the second and third antennas 810 and 820 respectively (as shown in the first The current paths D12 and D13 generated by the second and fourth radiators 812 and 822 are opposite, so there is good antenna isolation between the second antenna 810 and the third antenna 820 .

As shown in FIG. 9B, the current paths D14 and D15 generated by the second and third wireless signals on the second and third antennas 810 and 820 (such as on the third and fifth radiators 814 and 824) are opposite, so There is good antenna isolation between the second antenna 810 and the third antenna 820 .

In addition, as is well known in the industry, the radiation frequency, bandwidth, and efficiency of the antenna are related to the shape and material of the antenna. Therefore, the designer should be able to adjust the antenna 200, 210, 220, 600, 610, 320, 800, 810, and 820 The size, width, spacing, etc. of each component in the X, Y, and Z axes to meet the needs of the system. Others such as material, manufacturing method, shape and position of each component can be appropriately changed according to different needs, and are not limited thereto.

In summary, the present invention uses the first parasitic component and the second parasitic component to guide the reflected signal of the antenna without disturbing the main radiator, so as to improve the isolation between multiple antennas in a limited space, thereby increasing the antenna Efficiency, and ensure the normal operation of wireless transmission.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the claims of the present invention shall fall within the scope of the present invention.

Claims (18)

1. A radio frequency device, the radio frequency device is used for a wireless communication device, the radio frequency device comprises: An antenna setting area; a grounding assembly for providing grounding; A first antenna, the first antenna is arranged in the antenna installation area, and is used to send and receive a first wireless signal, the first antenna includes: a metal coupling piece; a first radiator, the first radiator is electrically connected to the ground component, and is used for transmitting the first wireless signal; A first signal feed-in component, the first signal feed-in component is electrically connected to the metal coupling plate, and is used to couple the first wireless signal to the first radiator through the metal coupling plate, so as to pass through the first the radiator emits the first wireless signal; and a first parasitic component, the first parasitic component is electrically connected to the ground component; a second antenna, the second antenna is arranged in the antenna installation area, and is used to send and receive a second wireless signal; a third antenna, the third antenna is arranged in the antenna installation area, and is used to send and receive a third wireless signal; and a second parasitic component, the second parasitic component is disposed in the antenna installation area, electrically connected to the ground component, and used to guide a first reflected signal of the first wireless signal to the second parasitic component, to increase the isolation between the first antenna and the second and third antennas; Wherein, the ground component is located between the first antenna and the second parasitic component, the second and third antennas, the first, second and third antennas share the ground component, and the metal coupling piece is roughly located between the first antenna and the second parasitic component. Between a parasitic component and the first radiator, the first parasitic component is used to guide a second reflected signal of the second wireless signal and a third reflected signal of the third wireless signal to the first parasitic component to increase the isolation between the first antenna and the second and third antennas. 2. The radio frequency device according to claim 1, wherein the ground component forms a first slot, the first slot is located between the first signal feeding component and the first radiator, so that the first wireless The current generated by the signal flows from the first signal feeding component to the first radiator along the periphery of the first slot. 3. The radio frequency device as claimed in claim 1, wherein the second antenna comprises: a second radiator; a third radiator, the third radiator is electrically connected to the ground component; A second signal feed-in component, the second signal feed-in component is electrically connected to the second radiator, and is used to transmit the second wireless signal to the second radiator, so as to emit the second wireless signal through the second radiator a second wireless signal; and A first short circuit component, the first short circuit component is electrically connected to the second radiator, the ground component and the second parasitic component. 4. The radio frequency device as claimed in claim 1, wherein the third antenna comprises: a fourth radiator; a fifth radiator, the fifth radiator is electrically connected to the ground component; A third signal feed-in component, the third signal feed-in component is electrically connected to the fourth radiator, and is used to transmit the third wireless signal to the fourth radiator, so as to transmit the wireless signal through the fourth radiator a third wireless signal; and A second short circuit component, the second short circuit component is electrically connected to the fourth radiator, the ground component and the second parasitic component. 5. The radio frequency device as claimed in claim 1, wherein a radio frequency signal processing module of the wireless communication device is arranged on the antenna installation area, the first antenna and the second, third antenna and the second parasitic component between. 6. The radio frequency device as claimed in claim 1, wherein a first length of the first parasitic element is approximately a quarter wavelength of a first operating frequency of the first wireless signal; the second parasitic element is approximately located at Between the second antenna and the third antenna, a second length of the second parasitic element is approximately a quarter wavelength of a second operating frequency of the first wireless signal; a first radiator of the first radiator The third length is roughly a quarter wavelength of a third operating frequency of the first wireless signal. 7. The radio frequency device according to claim 1, wherein the second parasitic component comprises an arm, the arm is disposed at the end of the second radiator, and is used to couple the second radiator to establish a signal connection; The second radiator extends approximately along a first axis, and the fourth radiator approximately extends along a second axis, wherein the first axis is perpendicular to the second axis. 8. The radio frequency device as claimed in claim 1, wherein the second antenna comprises: The second parasitic component is used to transmit the second wireless signal; a second radiator electrically connected to the ground component; A second signal feed-in component, the second signal feed-in component is electrically connected to the second radiator, and is used to couple the second wireless signal to the second parasitic component through the second radiator, so as to pass through the a second parasitic component transmits the second wireless signal; and A first short circuit component, the first short circuit component is electrically connected to the second radiator and the ground component. 9. The radio frequency device as claimed in claim 8, wherein the ground component forms a second slot, and the second slot is located between the second antenna and the third antenna. 10. A wireless communication device, the wireless communication device comprising: a system grounding piece for providing grounding; A radio frequency signal processing module, the radio frequency signal processing module is used to process a plurality of wireless signals; and A radio frequency device, the radio frequency device includes: An antenna setting area; a grounding assembly for providing grounding; A first antenna, the first antenna is arranged in the antenna installation area, and is used to send and receive a first wireless signal of the plurality of wireless signals, the first antenna includes: a metal coupling piece; a first radiator, the first radiator is electrically connected to the ground component, and is used for transmitting the first wireless signal; A first signal feed-in component, the first signal feed-in component is electrically connected to the metal coupling plate, and is used to couple the first wireless signal to the first radiator through the metal coupling plate, so as to pass through the first the radiator emits the first wireless signal; and a first parasitic component, the first parasitic component is electrically connected to the ground component; a second antenna, the second antenna is arranged in the antenna installation area, and is used to send and receive a second wireless signal of the plurality of wireless signals; a third antenna, the third antenna is arranged in the antenna installation area, and is used to send and receive a third wireless signal of the plurality of wireless signals; and a second parasitic component, the second parasitic component is disposed in the antenna installation area, electrically connected to the ground component, and used to guide a first reflected signal of the first wireless signal to the second parasitic component, to increase the isolation between the first antenna and the second and third antennas; Wherein, the ground component is located between the first antenna and the second parasitic component, the second and third antennas, the first, second and third antennas share the ground component, and the metal coupling piece is roughly located between the first antenna and the second parasitic component. Between a parasitic component and the first radiator, the first parasitic component is used to guide a second reflected signal of the second wireless signal and a third reflected signal of the third wireless signal to the first parasitic component to increase the isolation between the first antenna and the second and third antennas. 11. The wireless communication device as claimed in claim 10, wherein the ground component is formed with a first slot, the first slot is located between the first signal feeding component and the first radiator, so that the first The current generated by the wireless signal flows from the first signal feeding component to the first radiator along the periphery of the first slot. 12. The wireless communication device as claimed in claim 10, wherein the second antenna comprises: a second radiator; a third radiator, the third radiator is electrically connected to the ground component; A second signal feed-in component, the second signal feed-in component is electrically connected to the second radiator, and is used to transmit the second wireless signal to the second radiator, so as to emit the second wireless signal through the second radiator a second wireless signal; and A first short circuit component, the first short circuit component is electrically connected to the second radiator, the ground component and the second parasitic component. 13. The wireless communication device as claimed in claim 10, wherein the third antenna comprises: a fourth radiator; a fifth radiator, the fifth radiator is electrically connected to the ground component; A third signal feed-in component, the third signal feed-in component is electrically connected to the fourth radiator, and is used to transmit the third wireless signal to the fourth radiator, so as to transmit the wireless signal through the fourth radiator a third wireless signal; and A second short circuit component, the second short circuit component is electrically connected to the fourth radiator, the ground component and the second parasitic component. 14. The wireless communication device as claimed in claim 10, wherein the radio frequency signal processing module is disposed on the antenna installation area, between the first antenna, the second and third antennas and the second parasitic component. 15. The wireless communication device as claimed in claim 10, wherein a first length of the first parasitic element is approximately a quarter wavelength of a first operating frequency of the first wireless signal; the second parasitic element is approximately Located between the second antenna and the third antenna, a second length of the second parasitic component is approximately a quarter wavelength of a second operating frequency of the first wireless signal; a second length of the first radiator The third length is approximately a quarter wavelength of a third operating frequency of the first wireless signal. 16. The wireless communication device as claimed in claim 10, wherein the second parasitic component comprises an arm, the arm is disposed at the end of the second radiator for coupling the second radiator to establish a signal connection ; The second radiator extends approximately along a first axis, and the fourth radiator approximately extends along a second axis, wherein the first axis is perpendicular to the second axis. 17. The wireless communication device as claimed in claim 10, wherein the second antenna comprises: The second parasitic component is used to transmit the second wireless signal; a second radiator electrically connected to the ground component; A second signal feed-in component, the second signal feed-in component is electrically connected to the second radiator, and is used to couple the second wireless signal to the second parasitic component through the second radiator, so as to pass through the second radiator a second parasitic component transmits the second wireless signal; and A first short circuit component, the first short circuit component is electrically connected to the second radiator and the ground component. 18. The wireless communication device as claimed in claim 17, wherein the ground component forms a second slot, and the second slot is located between the second antenna and the third antenna.