CN118676611A - Near field communication antenna system and electronic equipment - Google Patents
Near field communication antenna system and electronic equipment Download PDFInfo
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- CN118676611A CN118676611A CN202411116769.XA CN202411116769A CN118676611A CN 118676611 A CN118676611 A CN 118676611A CN 202411116769 A CN202411116769 A CN 202411116769A CN 118676611 A CN118676611 A CN 118676611A
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- 238000004891 communication Methods 0.000 title claims abstract description 82
- 239000003990 capacitor Substances 0.000 claims abstract description 54
- 230000000903 blocking effect Effects 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
- H04B5/43—Antennas
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Abstract
本发明实施例公开了一种近场通信天线系统及电子设备，应用于电子设备技术领域。近场通信系统主要是应用于部署有多个物理按键的电子设备中，将高频天线信号端设置到物理按键所在电路中，不需要单独的空间部署近场通信天线，节省了近场通信实现的空间，并通过电容阻低频信号、通高频信号，电感阻高频信号、通低频信号的特性，在电子设备的内部电路中设置第一电容、第二电容、第一电感和第二电感，使得对物理按键的使用与对近场通信天线的使用之间相互独立，相互不干扰。
The embodiment of the present invention discloses a near field communication antenna system and electronic device, which are applied to the technical field of electronic devices. The near field communication system is mainly applied to electronic devices with multiple physical buttons, and the high frequency antenna signal end is set in the circuit where the physical buttons are located, so that no separate space is required to deploy the near field communication antenna, which saves the space for near field communication implementation, and through the characteristics of capacitors blocking low frequency signals and passing high frequency signals, and inductors blocking high frequency signals and passing low frequency signals, a first capacitor, a second capacitor, a first inductor, and a second inductor are set in the internal circuit of the electronic device, so that the use of the physical buttons and the use of the near field communication antenna are independent of each other and do not interfere with each other.
Description
Technical Field
The present invention relates to the field of electronic devices, and in particular, to a near field communication antenna system and an electronic device.
Background
Near Field Communication (NFC) is an emerging technology, and electronic devices (such as mobile phones) using the NFC technology can exchange data under the condition of being close to each other, and are integrated and evolved by a non-contact Radio Frequency Identification (RFID) and interconnection technology, and by integrating functions of an inductive card reader, an inductive card and point-to-point Communication on a single chip, applications such as mobile payment, electronic ticketing, access control, mobile identity recognition, anti-counterfeiting and the like are realized by using the electronic devices.
Conventional NFC antennas now generally use a flexible circuit board (Flexible Printed Circuit, FPC) to communicate with a loop antenna in a winding manner, and are generally designed around the back or under the screen of an electronic device, but some electronic devices have more physical key areas, and these areas cannot deploy the NFC antenna, so that these electronic devices cannot use the NFC function.
Disclosure of Invention
The embodiment of the invention provides a near field communication antenna system and electronic equipment, which realize the deployment of NFC antennas in a physical key area of the electronic equipment.
An aspect of an embodiment of the present invention provides a near field communication antenna system, including:
The high-frequency antenna signal end is used for transmitting and receiving high-frequency antenna signals; the low-frequency driving signal end is used for transmitting a low-frequency driving signal;
Each physical key is connected with a corresponding low-frequency driving signal end respectively so as to be communicated with the low-frequency driving signal to form a low-frequency passage; at least one physical key is respectively connected with the high-frequency antenna signal end so as to be communicated with the high-frequency antenna signal, and the at least one physical key is connected with other physical keys to form a high-frequency passage;
the first inductor is arranged in the low-frequency channel and used for communicating a low-frequency driving signal in the low-frequency channel and blocking the high-frequency antenna signal;
The first capacitor is arranged between the high-frequency antenna signal end and the at least one physical key, and is used for communicating high-frequency antenna signals between the high-frequency antenna signal end and the high-frequency channel and blocking low-frequency driving signals between the high-frequency antenna signal end and the high-frequency channel;
The second inductor is used for isolating high-frequency antenna signals between different high-frequency paths;
And the second capacitor is arranged in the high-frequency channel and used for communicating high-frequency antenna signals in the high-frequency channel and blocking the low-frequency driving signals so as to form a corresponding near-field communication antenna.
In another aspect, an embodiment of the present invention provides an electronic device, where a plurality of physical keys and a near field communication antenna system are disposed, where the near field communication antenna system multiplexes circuits where the plurality of physical keys are located, where:
the near field communication antenna system is a near field communication antenna system according to an aspect of an embodiment of the invention.
Therefore, the near field communication system in the embodiment of the invention is mainly applied to the electronic equipment provided with a plurality of physical keys, the signal end of the high-frequency antenna is arranged in the circuit where the physical keys are located, a separate space is not required to be arranged for deploying the near field communication antenna, the space for realizing near field communication is saved, and the characteristics of low-frequency signal resistance, high-frequency signal resistance and low-frequency signal resistance of the inductor are realized through the capacitor, the first capacitor, the second capacitor, the first inductor and the second inductor are arranged in the internal circuit of the electronic equipment, so that the use of the physical keys and the use of the near field communication antenna are mutually independent and are not mutually interfered.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic diagram of an electronic device using a near field communication antenna system according to an embodiment of the present invention;
Fig. 2 is a specific wiring structure of the electronic device after a near field communication antenna system is deployed inside the electronic device in an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a near field communication antenna system according to an embodiment of the present invention;
Fig. 4 is a schematic circuit structure diagram of a power key included in a near field communication antenna system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention provides a near field communication antenna system, which is mainly applied to an electronic device 110 with a plurality of physical keys 100 as shown in fig. 1, for example, an access control lock with physical keys, a physical key mobile phone and the like, in this embodiment, a near field communication (hereinafter referred to as NFC) antenna is not deployed on the back or under the screen of the electronic device 110, but a circuit between the physical keys 100 in the electronic device 110 is multiplexed to form a unique NFC antenna, and meanwhile, the operation of the NFC antenna and the use of the physical keys 100 do not interfere with each other.
It should be noted that, when the physical key 100 is disposed, the physical key is mainly divided into two parts, that is, an appearance part disposed on the housing of the electronic device 110 and provided for the physical key 100 pressed by the user, and a circuit connection part of the physical key 100 disposed in the internal circuit system of the electronic device 110, so that when the user presses the appearance part of the physical key 100, the appearance part and the circuit connection part are connected, and a circuit where the physical key 100 is located is connected. The physical key 100 described below in the near field communication antenna system mainly refers to a circuit connection portion of the physical key 100 in an internal circuit system of the electronic device 110.
In the embodiment of the present invention, as shown in fig. 2, a specific routing structure of an electronic device with a near field communication antenna system disposed therein is shown in fig. 3, which is a schematic circuit structure of the near field communication antenna system, specifically, the near field communication antenna system in the embodiment of the present invention includes:
the low frequency driving signal terminal 120 is configured to emit a low frequency driving signal.
A high frequency antenna signal terminal 130 for transmitting and receiving high frequency antenna signals. A plurality of physical keys 100, each physical key 100 is connected with a corresponding low-frequency driving signal end 120 respectively so as to communicate a low-frequency driving signal to form a low-frequency channel; at least one physical key 100 is connected to the high frequency antenna signal terminal 130, respectively, so as to communicate with the high frequency antenna signal, and the at least one physical key is connected to other physical keys to form a high frequency path.
The first inductor 200 is disposed in the low frequency path, and is used for communicating the low frequency driving signal in the low frequency path and blocking the high frequency antenna signal.
The first capacitor 210 is disposed between the high-frequency antenna signal terminal 130 and the at least one physical key 100, and is used for communicating the high-frequency antenna signal between the high-frequency antenna signal terminal 130 and the high-frequency channel, and blocking the low-frequency driving signal between the high-frequency antenna signal terminal 130 and the high-frequency channel.
And a second inductor 230 for isolating high frequency antenna signals between different high frequency paths.
And a second capacitor 220, disposed in the high-frequency path, for communicating the high-frequency antenna signal in the high-frequency path and blocking the low-frequency driving signal to form a corresponding near-field communication antenna.
The near field communication antenna system of the embodiment of the invention is in the process of the specific embodiment:
(1) For the connection between the physical key 100 and the low frequency driving signal terminal 120, mainly a low frequency path may be formed:
Generally, to facilitate routing, the circuit of the physical key is simplified, and according to the location of the physical key 100 in the electronic device 110, adjacent physical keys 100 may be driven by a low-frequency driving signal emitted by a low-frequency driving signal terminal 120, so that the adjacent physical keys 100 may be connected to the same low-frequency driving signal terminal 120. And there are some special physical keys in all the physical keys 100, such as physical keys that need to be separately set, and these physical keys may be separately connected to another low frequency driving signal terminal 120. The low frequency driving signal here refers to a low frequency signal required when using a physical key for driving the physical key.
For example, the physical keys K2, K1, K9, K17 and K24 shown in fig. 3 may be connected to the same low frequency driving signal terminal KROW3, respectively; the physical keys K3, K8, K10, K18 and K23 can be respectively connected to the same low-frequency driving signal terminal KROW1; the physical keys K4, K7, K11, K19 and K22 can be respectively connected to the same low-frequency driving signal end KROW0; the physical keys K5, K6, K12, K13 and K20 may be connected to the same low frequency driving signal terminal KROW2, respectively. The physical keys K14, K15 and K16 that need to be separately set may be connected to the same low frequency driving signal terminal KROW4, respectively. As shown in fig. 4, the physical key K21 is a power key, and is connected to the power signal PWRKEY.
(2) The low-frequency path formed by the near field communication antenna system of the embodiment includes: the low frequency driving signal terminal 120, the physical key 100 and the first inductor 200, where the first inductor 200 may have at least one.
In this embodiment, by providing the first inductor 200 in the low frequency channel, the first inductor 200 can block the high frequency signal by passing the low frequency signal, and when the user presses the appearance portion of the physical key from the outside of the electronic device, the appearance portion of the physical key and the circuit connection portion are connected, so that the circuit in which the physical key 100 is located, i.e. the low frequency channel, is connected. In this case, a low-frequency signal flows through the circuit where the physical key 100 is located, and the low-frequency signal can be passed through the first inductor 200, so that the physical key 100 can be normally used.
For example, as shown in fig. 3, the low-frequency driving signal passes through two second inductors L108, L106, one physical key K4 and the other second inductor L105 from the low-frequency driving signal end KROW0 to the low-frequency driving signal end KCOL0; the low-frequency driving signal passes through a second inductor L108, a physical key K11 and another second inductor L101 from the low-frequency driving signal end KROW0 to the low-frequency driving signal end KCOL0; the low frequency driving signal passes through a second inductor L116, a physical key K3, and another second inductor L110 from the low frequency driving signal end KROW1 to the low frequency driving signal end KCOL 0.
(3) For the connection between the physical key 100 and the high-frequency antenna signal terminal 130, a high-frequency path is mainly formed, and the high-frequency path formed by the near-field communication antenna system of the embodiment includes: the high-frequency antenna signal terminal 130, the first capacitor 210, the physical key 100 and the second capacitor 220. The high frequency path thus formed is equivalent to a near field communication antenna.
The near field communication antenna system of this embodiment may include one or more high frequency paths, one high frequency path may include some or all of the physical keys therein, and one high frequency antenna signal terminal 130 for receiving the high frequency antenna signal may be connected to the one or more high frequency paths. For example, as shown in fig. 4, the physical key forms two high frequency paths, which are mainly driven by the high frequency antenna signal received by one high frequency antenna signal terminal 130. The high-frequency antenna signal here mainly refers to a high-frequency signal required for communication of a path for driving the near field communication antenna. Specifically:
The high-frequency channel comprises an inner ring channel, wherein the inner ring channel comprises first physical keys arranged on the inner ring of the electronic equipment, and the first physical keys are sequentially connected according to the positions arranged on the inner ring of the electronic equipment. Such as physical keys K3, K8, K10, K15, K18, K19, K14, K11 and K7.
The other high-frequency passage comprises an outer ring passage, the outer ring passage comprises second physical keys arranged on the outer ring of the electronic equipment, and the second physical keys are sequentially connected according to the positions arranged on the outer ring of the electronic equipment. Such as physical keys K2, K1, K9, K16, K17, K24, K23, K22, K21, K20, K13, K12, K6, K5 and K4.
In other embodiments, in order to enhance the signal strength of near field communication, a plurality of high frequency antenna signal terminals 130 for receiving high frequency antenna signals may be included in the near field communication antenna system, and accordingly the same number of high frequency antenna signal terminals for transmitting high frequency antenna signals may be included, and each high frequency antenna signal terminal 130 may be connected to a high frequency channel formed by a part of the physical keys, particularly, the high frequency channel connection formed by which physical keys is not limited herein. In the process, when a plurality of high-frequency antenna signal ends in the electronic equipment are connected with the high-frequency channel, all physical keys in the electronic equipment can be covered as much as possible, so that the area of the near field communication antenna is as large as possible, and the signal intensity of near field communication is ensured.
In addition, it should be noted that, in the near field communication antenna system of the present embodiment, the high frequency path multiplexes the connection between the already connected physical keys in the low frequency path where the physical keys are located, so that the second capacitor 220 is mainly connected between the unconnected physical keys in the low frequency path where the physical keys are located, so as to connect each physical key in the high frequency path.
For example, as shown in fig. 3, physical keys K2, K1 and K9 in the outer ring path are already connected physical keys in the low frequency path, and can be directly multiplexed; the physical keys K9 and K16 are connected through a second capacitor 220 (namely C114), and the physical keys K16 and K17 are connected through another second capacitor 220 (namely C111); the physical keys K17 and K24 are connected in a low-frequency channel and can be directly multiplexed; capacitors C108, C106, C101 and C107 are required to be respectively arranged between the physical keys K24 and K23, between the physical keys K23 and K22, between the physical keys K22 and K21 and between the physical keys K21 and K20 for connection; the physical keys K20, K13, K12, K6 and K5 are connected in a low-frequency channel and can be directly multiplexed; the physical keys K5 and K4 need to be connected by a capacitor C105.
As shown in fig. 3, the physical keys K3, K8, K10 in the inner ring path are connected in the low frequency path, and can be directly multiplexed; capacitors C109, C113, C103, C115 and C112 are needed to be respectively arranged between the physical keys K10 and K15, K15 and K18, K18 and K19, K19 and K14 and between K14 and K11; the physical keys K14, K11 and K7 are connected in a low-frequency path and can be directly multiplexed.
In this way, since the existing connection of the physical key in the low-frequency path is multiplexed in the high-frequency path, in order to prevent interference between the use of the near-field communication antenna and the use of the physical key, the path using the near-field communication antenna uses a high-frequency signal, and the path using the physical key uses a low-frequency signal. When the near field communication antenna arranged in the electronic equipment is used, high-frequency antenna signals are input from the high-frequency antenna signal end 130, and the first capacitor 210 and the second capacitor 220 can well pass the high-frequency signals and block low-frequency signals, so that each high-frequency channel is connected through the capacitor and can block the low-frequency signals when the physical key is used, and the use of the physical key does not influence the use of the near field communication antenna; when the physical key is used, the low-frequency driving signal is input from the low-frequency driving signal end 120, and the physical key is connected through the first inductor, so that the high-frequency signal when the high-frequency antenna signal end 130 is used can be blocked, the use of the near-field communication antenna does not affect the use of the physical key, and the signals of the low-frequency path using the physical key and the high-frequency path using the near-field communication antenna are not affected each other.
(4) In order to block high frequency antenna signals between different high frequency circuits, a second inductance 230 is provided in the system, in particular:
In a specific embodiment, a plurality of high-frequency antenna signal terminals for receiving the high-frequency antenna signal may be provided in the electronic device, and accordingly, the same number of high-frequency antenna signal terminals for transmitting the high-frequency antenna signal may be provided, so that each high-frequency antenna signal terminal 130 may be connected to a corresponding one of the high-frequency channels, and a plurality of high-frequency channels may be included in the system, so that the plurality of high-frequency channels need to be blocked without interfering with each other. If the plurality of physical keys connected in the low frequency path are in different high frequency paths, the second inductor 230 may be used for blocking.
For example, as shown in fig. 3, the physical keys K23 and the physical keys K18, K10, K8, K3 are connected in the low-frequency paths, but are in different high-frequency paths, and a second inductor 230 for blocking the two high-frequency paths, namely, inductors L115 and L117 needs to be added; the physical keys K22 and the physical keys K19, K11 and K7 are connected in a low-frequency passage, and the blocking inductors L107 and L109 are required to be added; the physical keys K4 and the physical keys K19, K11 and K7 are connected in a low-frequency path, but are in different high-frequency paths, and a second inductor 230 for isolation, namely an inductor L106, needs to be added; the physical keys K14, K15, K16 are connected in the low-frequency path, and the blocking inductors L134 and L135 need to be arranged between every two physical keys.
(5) A third capacitor 240 may also be included in the high frequency path of the system, specifically:
In other specific embodiments, only one high frequency antenna signal terminal 130 for receiving a high frequency antenna signal may be provided in the electronic device, and accordingly, there may be one high frequency antenna signal terminal for transmitting a high frequency antenna signal, and all physical keys in the electronic device form a plurality of high frequency paths, and may be connected to one high frequency path of the plurality of high frequency paths through one high frequency antenna signal terminal 130, in which case the near field communication antenna system may further include a third capacitor 240, specifically:
And a third capacitor 240 disposed between two adjacent high frequency paths among the plurality of high frequency paths, for communicating a high frequency antenna signal between the two adjacent high frequency paths, and blocking the low frequency driving signal.
For example, as shown in fig. 3, the physical key K3 and the physical key K4 respectively belong to an inner ring path and an outer ring path, and when the two paths need to share a high-frequency antenna signal of a high-frequency antenna signal end, a third capacitor 240, that is, a capacitor C104, may be connected between the physical keys K3 and K4.
(6) In order to block the high frequency antenna signal between the high frequency path and the ground, a third inductance 250 is provided in the system, specifically:
In other embodiments, the physical key in the high-frequency antenna signal terminal system includes a power key, and the high-frequency channel includes a power key, and a third inductor 250 is connected between the power key and the ground line.
For example, fig. 4 shows a schematic circuit diagram of a power button K21 in an electronic device, in which an inductor L136 is connected between the power button K21 and a power signal (PWRKEY) that is a driving signal thereof, and a third inductor 250, that is, an inductor L137 is connected between the power button K21 and a Ground (GND).
(7) A fourth capacitor 260 may also be included in the high frequency path of the system, specifically:
In a specific embodiment, in order to realize connection between the power key and two adjacent physical keys in the high-frequency path, the physical keys adjacent to the power key in the high-frequency path are respectively connected to a specific end through the fourth capacitor 260, and the power key is also connected to the specific end, so that connection between the power key and two adjacent physical keys can be realized through the same ends connected to the near field communication antenna. Then the high frequency path in the system further includes:
A fourth capacitor 260 disposed between the physical key adjacent to the power key and the specific terminal for communicating the high-frequency antenna signal between the adjacent physical key and the specific terminal and blocking the low-frequency driving signal
For example, as shown in fig. 3, for two physical keys K22 and K20 adjacent to the power key K21, the two physical keys K22 and K20 may be connected to a specific terminal (pwr_nfc) of the near field communication antenna through capacitors C101 and C107, respectively, and the power key K21 is also connected to the specific terminal (pwr_nfc) of the near field communication antenna, thereby realizing connection between the power key K21 and the adjacent two physical keys K22 and K20, respectively.
Therefore, the near field communication system in the embodiment of the invention is mainly applied to the electronic equipment provided with a plurality of physical keys, the signal end of the high-frequency antenna is arranged in the circuit where the physical keys are located, a separate space is not required for arranging the near field communication antenna, the space for realizing near field communication is saved, the high-frequency signal is passed through the capacitor for blocking the low-frequency signal, the inductor for blocking the high-frequency signal and passing the low-frequency signal is characterized in that the first capacitor, the second capacitor, the first inductor and the second inductor are arranged in the internal circuit of the electronic equipment, so that the use of the physical keys and the use of the near field communication antenna are mutually independent and are not mutually interfered.
The following describes a specific application example of the near field communication antenna system in the present invention, as shown in fig. 2 to 4, where the electronic device to which the near field communication antenna system in the present embodiment is applied includes 24 physical keys K1 to K24, as shown in fig. 3, the near field communication antenna deployed in the near field communication antenna system is a black thick line connected around the physical keys, and mainly, by adding an inductance and capacitance filter network in a circuit where the physical keys are located, the outer ring of the physical keys is connected in a city shape, so as to achieve a near field communication antenna effect. Specifically, the near field communication antenna of the present embodiment includes:
The high-frequency antenna signal terminals nfc_3 and nfc_0 are high-frequency antenna signal input/output terminals for transmitting and receiving high-frequency antenna signals. The low frequency driving signal terminals KROW0 to KROW4 (or KCOL0 to KCOL 4) are configured to emit the low frequency driving signals.
A plurality of physical keys K1 to K24, each physical key being connected to a corresponding low-frequency driving signal terminal KROW0 to KROW4 (or KCOL0 to KCOL 4), respectively, to form a low-frequency path; at least one physical key K2 and K7 are respectively connected with the high-frequency antenna signal terminals NFC_3 and NFC_0 so as to communicate the high-frequency antenna signal, and the at least one physical key K2 and K7 are connected with the rest other physical keys to form a high-frequency channel.
And the first inductor is arranged in the low-frequency path and used for communicating a low-frequency driving signal in the low-frequency path and blocking a high-frequency antenna signal. I.e. an inductance connected to each physical key, such as inductance L124 connected to physical key K2, inductance L126 connected to physical key K1, etc.
The first capacitors C110 and C102 are respectively disposed between the high-frequency antenna signal terminal nfc_3 and the physical key K2, and between the high-frequency antenna signal terminal nfc_0 and the physical key K7, and are used for communicating the high-frequency antenna signal between the high-frequency antenna signal terminal and the high-frequency channel, and blocking the low-frequency driving signal between the high-frequency antenna signal terminal and the high-frequency channel.
The second inductors L115, L117, L107, L109, L106, L134, and L135 are used to isolate the high frequency antenna signals between the different high frequency paths.
The second capacitors C114, C111, C108, C106, C101, C107, C105, C109, C113, C103, C115 and C112 are disposed in the high-frequency path for communicating the high-frequency antenna signals in the high-frequency path and blocking the low-frequency driving signals to form corresponding near-field communication antennas.
Further, the near field communication antenna system further comprises:
And a third capacitor C104, disposed between two adjacent high-frequency paths among the plurality of high-frequency paths, for communicating high-frequency antenna signals between the two adjacent high-frequency paths and blocking low-frequency driving signals.
The third inductor L137 is disposed between the power key K21 and the ground line.
The fourth capacitors C101 and C107 are respectively disposed between the physical keys K22 and K20 adjacent to the power key K21 and the specific terminal pwr_nfc, and are used for communicating the high-frequency antenna signals between the adjacent physical keys and the specific terminal and blocking the low-frequency driving signals.
Specifically, in the near field communication antenna system of the present embodiment:
(1) Each physical key 100 is connected to the low frequency driving signal terminal 120 to form a low frequency path.
The physical keys K2, K1, K9, K17 and K24 can be respectively connected to the same low-frequency driving signal terminal KROW3; the physical keys K3, K8, K10, K18 and K23 can be respectively connected to the same low-frequency driving signal terminal KROW1; the physical keys K4, K7, K11, K19 and K22 can be respectively connected to the same low-frequency driving signal end KROW0; the physical keys K5, K6, K12, K13 and K20 may be connected to the same low frequency driving signal terminal KROW2, respectively. The physical keys K14, K15 and K16 that need to be separately set may be connected to the same low frequency driving signal terminal KROW4, respectively.
Each physical key can be driven by adopting the combination of different KCOL signals and KROW signals, and in particular, in order to facilitate wiring arrangement, the physical keys on the same vertical line or horizontal line are driven by using the same KCOL signals or KROW signals so as to simplify the difficulty of key circuit arrangement. For example, as shown in fig. 3, the low-frequency driving signal of the low-frequency driving signal terminal KROW0 may drive the physical keys K4, K7, K11, K19 and K22; the low-frequency driving signal of the low-frequency driving signal terminal KROW1 can drive the physical keys K3, K8, K10, K18 and K23; the low-frequency driving signal of the low-frequency driving signal terminal KROW2 can drive the physical keys K5, K6, K12, K13 and K20; the low-frequency driving signal of the low-frequency driving signal terminal KROW3 can drive the physical keys K2, K1, K9, K17 and K24; the low-frequency driving signal of the low-frequency driving signal terminal KROW4 may drive the physical keys K14, K15 and K16. The low-frequency driving signal of the low-frequency driving signal end KCOL0 can drive the physical keys K4, K3, K13, K2 and K14; the low-frequency driving signal of the low-frequency driving signal end KCOL1 can drive the physical keys K11, K10, K12, K9 and K15; the low-frequency driving signal of the low-frequency driving signal end KCOL2 can drive the physical keys K22, K23, K5, K24 and K16; the low-frequency driving signal of the low-frequency driving signal end KCOL3 can drive the physical keys K19, K18, K20 and K17; the low frequency driving signal of the low frequency driving signal terminal KCOL4 can drive the physical keys K7, K8, K6, and K1.
(2) In the low frequency path, a corresponding first inductor may be connected between the low frequency driving signal terminal 120 and the physical key, so that each physical key is connected to a corresponding first inductor, respectively.
For example, as shown in fig. 2 and 3, in the key circuit, five inductors L108, L116, L123, L127 and L133 are added to the inputs of the respective low-frequency driving signal terminals KROW0 to KROW 4; the first inductances respectively connected with the physical keys K1 to K24 are as follows: inductance L126、L124、L110、L105、L121、L118、L104、L114、L128、L111、L101、L120、L119、L130、L131、L132、L125、L113、L103、L122、L136、L102、L112, and L129.
(3) A high frequency path formed by a plurality of physical keys, comprising: an inner ring passage: consists of physical keys K3, K8, K10, K15, K18, K19, K14, K11 and K7; the outer ring passage: consists of physical keys K2, K1, K9, K16, K17, K24, K23, K22, K21, K20, K13, K12, K6, K5 and K4.
(4) In the high-frequency path, the output terminal nfc_0 and the input terminal nfc_3 of the high-frequency antenna signal are respectively connected to the first capacitors C102 and C110, and the first capacitors C102 and C110 are respectively connected to the physical keys K7 and K2, where in this embodiment, the high-frequency path specifically includes an outer ring path and an inner ring path, where:
(41) For the physical keys K2, K1, K9, K16, K17, K24, K23, K22, K21, K20, K13, K12, K6, K5 and K4 included in the outer ring path, among the physical keys, the physical keys unconnected in the low frequency path are connected through the second capacitor, so that the low frequency signal can be effectively prevented, and the high frequency signal can be passed. Specifically:
The physical keys K9 and K16 are connected through a capacitor C114; the physical keys K16 and K17 are connected through a capacitor C111; the physical keys K24 and K23, K23 and K22, K22 and K21, and K21 and K20 are respectively connected through capacitors C108, C106, C101 and C107; the physical keys K5 and K4 are connected through a capacitor C105.
Wherein, for two physical keys K22 and K20 adjacent to the power key K21, the physical keys K22 and K20 are connected to a specific terminal (pwr_nfc) of the near field communication antenna through capacitors C101 and C107, respectively, and the power key K21 is also connected to the specific terminal (pwr_nfc) of the near field communication antenna, thereby realizing connection between the power key K21 and the adjacent two physical keys K22 and K20, respectively.
(42) For the physical keys K3, K8, K10, K15, K18, K19, K14, K11 and K7 included in the inner ring path, the physical keys are connected between the physical keys which are not connected in the low-frequency path through the second capacitor, so that low-frequency signals can be effectively prevented, and high-frequency signals can be transmitted. Specifically:
The physical keys K10 and K15, K15 and K18, K18 and K19, K19 and K14, and K14 and K11 are respectively connected through capacitors C109, C113, C103, C115 and C112.
(5) In this embodiment, a high-frequency antenna signal terminal is shared between two high-frequency paths of the near-field communication antenna system to input a high-frequency antenna signal, and the two high-frequency paths are connected by a third capacitor, specifically:
and a capacitor C104 is arranged between the physical key K4 in the outer ring passage and the physical key K3 in the inner ring passage for connection.
(6) A second inductance is employed between the different high frequency paths to block the high frequency antenna signals, in particular:
The physical keys K23 and the physical keys K18, K10, K8 and K3 are connected with each other to isolate the inductances L115 and L117; the physical key K22 and the physical keys K19, K11 and K7 are connected with the isolating inductors L107 and L109; the physical key K4 is connected with the physical keys K19, K11 and K7 to isolate the inductance L106; the physical keys K14, K15 and K16 are connected in pairs to separate the inductors L134 and L135.
In addition, the inputs of the low-frequency driving signal terminals KROW0 to KROW4 are respectively connected to five inductors L108, L116, L123, L127 and L133 for blocking the high-frequency antenna signals.
The embodiment of the invention also provides an electronic device, wherein a plurality of physical keys and a near field communication antenna system are deployed in the electronic device, and the near field communication antenna system multiplexes circuits in which the plurality of physical keys are located, wherein: the near field communication antenna system is the near field communication antenna system described in the above embodiments, and will not be described herein.
It should be noted that, when the near field communication antenna system is deployed in the electronic device, it is necessary to add wires on the circuit board where the internal circuit of the electronic device is located, specifically add wires of the high frequency antenna signal end and the inductance and capacitance filter network, where some wires are directly added to the surface of the circuit board, and some wires need to be added in the inner layer of the circuit board in order to avoid other wires on the surface of the circuit board, so that the inner layer of the circuit board is communicated with the surface of the circuit board.
For example, as shown in fig. 2, two wires 140 on the circuit board need to be directly connected, but if wires directly connected to the surface of the circuit board are added, the capacitor C104 will be affected, and wires connecting the two wires 140 need to be added to the inner layer of the circuit board.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program to instruct related hardware, the program may be stored in a computer readable storage medium, and the storage medium may include: read Only Memory (ROM), random Access Memory (RAM), magnetic or optical disks, and the like.
The above describes the near field communication antenna system and the electronic device provided by the embodiments of the present invention in detail, and specific examples are applied to the description of the principles and the implementation modes of the present invention, where the description of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (10)
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| CN118693519A (en) * | 2024-08-15 | 2024-09-24 | 无锡宇宁智能科技有限公司 | Near field communication antenna setting method, device and electronic equipment |
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