Near field communication antenna system and electronic equipment

Abstract

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

[0001] The present invention relates to the technical field of electronic equipment, and in particular to a near field communication antenna system and electronic equipment. Background Art

[0002] Near Field Communication (NFC) is an emerging technology. Electronic devices (such as mobile phones) that use NFC technology can exchange data when they are close to each other. It is an integration of contactless radio frequency identification (RFID) and interconnection technology. By integrating the functions of inductive card readers, inductive cards and point-to-point communication on a single chip, electronic devices can be used to realize mobile payment, electronic ticketing, access control, mobile identity recognition, anti-counterfeiting and other applications.

[0003] Conventional NFC antennas are usually loop antennas wound around flexible printed circuits (FPC), which are usually designed around the back of electronic devices or under the screen. However, some electronic devices have more physical button areas, and NFC antennas cannot be deployed in these areas, making these electronic devices unable to use the NFC function. Summary of the invention

[0004] The embodiments of the present invention provide a near field communication antenna system and an electronic device, which realize the deployment of an NFC antenna in a physical key area of ​​the electronic device.

[0005] An embodiment of the present invention provides a near field communication antenna system, including:

[0006] The high-frequency antenna signal terminal is used to transmit and receive high-frequency antenna signals; the low-frequency drive signal terminal is used to transmit low-frequency drive signals;

[0007] A plurality of physical keys, each of which is connected to a corresponding low-frequency drive signal terminal to communicate the low-frequency drive signal to form a low-frequency path; at least one physical key is connected to the high-frequency antenna signal terminal to communicate the high-frequency antenna signal, and the at least one physical key is connected to other physical keys to form a high-frequency path;

[0008] A first inductor is arranged in the low-frequency path, and is used to connect the low-frequency driving signal in the low-frequency path and block the high-frequency antenna signal;

[0009] a first capacitor, disposed between the high-frequency antenna signal terminal and the at least one physical button, for connecting the high-frequency antenna signal between the high-frequency antenna signal terminal and the high-frequency path, and blocking the low-frequency driving signal between the high-frequency antenna signal terminal and the high-frequency path;

[0010] A second inductor is used to isolate high-frequency antenna signals between different high-frequency paths;

[0011] The second capacitor is arranged in the high-frequency path, and is used to connect the high-frequency antenna signal in the high-frequency path and block the low-frequency driving signal to form a corresponding near-field communication antenna.

[0012] Another aspect of an embodiment of the present invention provides an electronic device, in which a plurality of physical buttons and a near field communication antenna system are deployed, and the near field communication antenna system reuses the circuits where the plurality of physical buttons are located, wherein:

[0013] The near field communication antenna system is the near field communication antenna system as described in one aspect of an embodiment of the present invention.

[0014] It can be seen that the near-field communication system in the embodiment of the present invention is mainly used in electronic devices deployed with multiple physical buttons. The high-frequency antenna signal end is set in the circuit where the physical buttons are located. There is no need to deploy the near-field communication antenna in a separate space, which saves space for near-field communication implementation. The first capacitor, the second capacitor, the first inductor and the second inductor are set in the internal circuit of the electronic device 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, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 is a schematic diagram of an electronic device using a near field communication antenna system provided by an embodiment of the present invention;

[0017] Figure 2 It is a specific wiring structure after a near field communication antenna system is deployed inside the electronic device in the embodiment of the present invention;

[0018] Figure 3 is a schematic diagram of the circuit structure of a near field communication antenna system in an embodiment of the present invention;

[0019] Figure 4 Schematic diagram of the circuit structure of a power button included in the near field communication antenna system in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] The embodiment of the present invention provides a near field communication antenna system, which is mainly used in Figure 1 In the electronic device 110 shown in which multiple physical buttons 100 are deployed, for example, an access lock with physical buttons, a physical button mobile phone, etc., 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 the circuits between the physical buttons 100 in the electronic device 110 are reused to form a unique NFC antenna. At the same time, the operation of the NFC antenna and the use of the physical buttons 100 do not interfere with each other.

[0023] It should be noted that when the physical key 100 is deployed, it is mainly divided into two parts, namely, the appearance part of the physical key 100 deployed on the housing of the electronic device 110 and provided to the user to press, and the circuit connection part of the physical key 100 deployed in the internal circuit system of the electronic device 110. In this way, when the user presses the appearance part of the physical key 100, the appearance part and the circuit connection part are connected, thereby connecting the circuit where the physical key 100 is located. The physical key 100 described below in the near field communication antenna system mainly refers to the circuit connection part of the physical key 100 in the internal circuit system of the electronic device 110.

[0024] In the embodiment of the present invention, Figure 2 The figure shows the specific wiring structure after the near field communication antenna system is deployed inside the electronic device, such as Figure 3FIG. 1 is a schematic diagram of a circuit structure of a near field communication antenna system. Specifically, the near field communication antenna system in an embodiment of the present invention includes:

[0025] The low-frequency driving signal terminal 120 is used to transmit a low-frequency driving signal.

[0026] The high-frequency antenna signal terminal 130 is used to transmit and receive high-frequency antenna signals. Multiple physical buttons 100, each of which is connected to the corresponding low-frequency drive signal terminal 120 to connect the low-frequency drive signal to form a low-frequency path; at least one physical button 100 is connected to the high-frequency antenna signal terminal 130 to connect the high-frequency antenna signal, and at least one physical button is connected to other physical buttons to form a high-frequency path.

[0027] The first inductor 200 is disposed in the low-frequency path, and is used to connect the low-frequency driving signal in the low-frequency path and block the high-frequency antenna signal.

[0028] The first capacitor 210 is arranged between the high-frequency antenna signal terminal 130 and at least one physical button 100, and is used to connect the high-frequency antenna signal between the high-frequency antenna signal terminal 130 and the high-frequency path, and block the low-frequency driving signal between the high-frequency antenna signal terminal 130 and the high-frequency path.

[0029] The second inductor 230 is used to isolate high-frequency antenna signals between different high-frequency paths.

[0030] The second capacitor 220 is disposed in the high-frequency path, and is used to connect the high-frequency antenna signal in the high-frequency path and block the low-frequency driving signal to form a corresponding near-field communication antenna.

[0031] The near field communication antenna system of the embodiment of the present invention is implemented in the specific implementation process:

[0032] (1) The connection between the physical key 100 and the low-frequency driving signal terminal 120 can mainly form a low-frequency path:

[0033] Generally speaking, in order to facilitate the wiring setting and simplify the circuit of the physical key, according to the position of the physical key 100 deployed in the electronic device 110, multiple adjacent physical keys 100 can be driven by a low-frequency driving signal emitted by a low-frequency driving signal terminal 120, so that the multiple adjacent physical keys 100 can be connected to the same low-frequency driving signal terminal 120. And among all the physical keys 100, there are some special physical keys, such as physical keys that need to be set separately, etc. These physical keys can be connected to another low-frequency driving signal terminal 120 respectively. The low-frequency driving signal here refers to the low-frequency signal required when using the physical key and used to drive the physical key.

[0034] For example Figure 3The physical keys K2, K1, K9, K17 and K24 shown in the figure can be connected to the same low-frequency drive signal terminal KROW3 respectively; the physical keys K3, K8, K10, K18 and K23 can be connected to the same low-frequency drive signal terminal KROW1 respectively; the physical keys K4, K7, K11, K19 and K22 can be connected to the same low-frequency drive signal terminal KROW0 respectively; the physical keys K5, K6, K12, K13 and K20 can be connected to the same low-frequency drive signal terminal KROW2 respectively. The physical keys K14, K15 and K16 that need to be set separately can be connected to the same low-frequency drive signal terminal KROW4 respectively. Figure 4 As shown, the physical key K21 is a power key, which is connected to the power signal PWRKEY.

[0035] (2) The low-frequency path formed by the near-field communication antenna system of this embodiment includes: a low-frequency driving signal terminal 120, a physical button 100 and a first inductor 200, where there can be at least one first inductor 200.

[0036] In this embodiment, by setting the first inductor 200 in the low-frequency path, the first inductor 200 can pass low-frequency signals and block high-frequency signals. When the user presses the appearance part of the physical key from the outside of the electronic device, the appearance part of the physical key and the circuit connection part are connected, thereby connecting the circuit where the physical key 100 is located, that is, the low-frequency path. In this case, the low-frequency signal circulates in 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 used normally.

[0037] For example Figure 3 As shown in, the low-frequency drive signal needs to pass through two second inductors L108, L106, a physical button K4 and another second inductor L105 from the low-frequency drive signal terminal KROW0 to the low-frequency drive signal terminal KCOL0; the low-frequency drive signal needs to pass through a second inductor L108, a physical button K11 and another second inductor L101 from the low-frequency drive signal terminal KROW0 to the low-frequency drive signal terminal KCOL0; the low-frequency drive signal needs to pass through a second inductor L116, a physical button K3 and another second inductor L110 from the low-frequency drive signal terminal KROW1 to the low-frequency drive signal terminal KCOL0, and so on.

[0038] (3) The connection between the physical button 100 and the high-frequency antenna signal terminal 130 mainly forms a high-frequency path. The high-frequency path formed by the near-field communication antenna system of this embodiment includes: the high-frequency antenna signal terminal 130, the first capacitor 210, the physical button 100, and the second capacitor 220. The high-frequency path formed in this way is equivalent to the near-field communication antenna.

[0039] 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 buttons, and a high frequency antenna signal terminal 130 for receiving high frequency antenna signals may be connected to one or more high frequency paths. Figure 4 As shown, the physical button forms two high-frequency paths, and the two high-frequency paths can be driven mainly by a high-frequency antenna signal received by a high-frequency antenna signal terminal 130. The high-frequency antenna signal here mainly refers to the high-frequency signal required for driving the path connection of the near-field communication antenna. Specifically:

[0040] A high-frequency path includes an inner circle path, and the inner circle path includes the first physical keys deployed in the inner circle of the electronic device, and the first physical keys are connected in sequence according to the positions deployed in the inner circle of the electronic device, such as physical keys K3, K8, K10, K15, K18, K19, K14, K11 and K7.

[0041] Another high-frequency path includes an outer ring path, and the outer ring path includes second physical keys arranged in the outer ring of the electronic device, and the second physical keys are connected in sequence according to the positions arranged in the outer ring of the electronic device, such as physical keys K2, K1, K9, K16, K17, K24, K23, K22, K21, K20, K13, K12, K6, K5 and K4.

[0042] In other embodiments, in order to enhance the signal strength of near field communication, the near field communication antenna system may include multiple high frequency antenna signal terminals 130 for receiving high frequency antenna signals, and correspondingly may include the same number of high frequency antenna signal terminals for transmitting high frequency antenna signals, each high frequency antenna signal terminal 130 may be connected to a high frequency path formed by some physical keys, and the specific high frequency paths formed by the physical keys are not limited here. In this process, it is ensured as much as possible that the multiple high frequency antenna signal terminals in the electronic device can cover all the physical keys in the electronic device when connected to the high frequency path, so that the area of ​​the near field communication antenna is as large as possible, and the signal strength of the near field communication is ensured.

[0043] In addition, it should be noted that the high-frequency path in the near-field communication antenna system of this embodiment reuses the connection between the physical keys that are already connected 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 the physical keys in the high-frequency path.

[0044] For example Figure 3As shown, the physical keys K2, K1 and K9 in the outer circle path are already connected physical keys in the low-frequency path and can be directly reused; the physical keys K9 and K16 are connected through a second capacitor 220 (i.e., C114), and the physical keys K16 and K17 are connected through another second capacitor 220 (i.e., C111); the physical keys K17 and K24 are already connected in the low-frequency path and can be directly reused; the physical keys K24 and K23, K23 and K22, K22 and K21, and K21 and K20 need to be connected with capacitors C108, C106, C101 and C107 respectively; the physical keys K20, K13, K12, K6, and K5 are already connected in the low-frequency path and can be directly reused; the physical keys K5 and K4 need to be connected with capacitor C105.

[0045] Another example Figure 3 As shown, in the inner circle path, the physical keys K3, K8, and K10 are already connected in the low-frequency path and can be directly reused; capacitors C109, C113, C103, C115, and C112 need to be set between the physical keys K10 and K15, K15 and K18, K18 and K19, K19 and K14, and K14 and K11 respectively; the physical keys K14, K11, and K7 are already connected in the low-frequency path and can be directly reused.

[0046] In this way, since the existing connection of the physical key in the low-frequency path is reused in the high-frequency path, in order to prevent the use of the near-field communication antenna and the use of the physical key from interfering with each other, the path using the near-field communication antenna uses a high-frequency signal, while the path using the physical key uses a low-frequency signal. When the near-field communication antenna set in the electronic device is used, the high-frequency antenna signal is input from the high-frequency antenna signal terminal 130, and the first capacitor 210 and the second capacitor 220 can pass the high-frequency signal and block the low-frequency signal well, so that each high-frequency path is connected through the capacitor, and the low-frequency signal when the physical key is used can be blocked, so that the use of the physical key does not affect the use of the near-field communication antenna; when the physical key is used, the low-frequency drive signal is input from the low-frequency drive signal terminal 120, and the physical key is connected through the first inductor, which can block the high-frequency signal when the high-frequency antenna signal terminal 130 is used, so that the use of the near-field communication antenna does not affect the use of the physical key, so that the signals of the low-frequency path using the physical key and the high-frequency path using the near-field communication antenna do not affect each other.

[0047] (4) In order to block the high-frequency antenna signals between different high-frequency circuits, a second inductor 230 is provided in the system. Specifically:

[0048] In a specific embodiment, a plurality of high-frequency antenna signal terminals for receiving high-frequency antenna signals can be set in the electronic device, and the same number of high-frequency antenna signal terminals for transmitting high-frequency antenna signals can be provided accordingly, so that each high-frequency antenna signal terminal 130 can be connected to a corresponding high-frequency path. The system includes multiple high-frequency paths, and it is necessary to block the multiple high-frequency paths so as not to interfere with each other. If multiple physical buttons connected in the low-frequency path are in different high-frequency paths, they need to be blocked, and the second inductor 230 can be used for blocking.

[0049] For example Figure 3 As shown, the physical key K23 is connected to the physical keys K18, K10, K8, and K3 in the low-frequency path, but they are in different high-frequency paths, and it is necessary to add a second inductor 230 for isolating the two high-frequency paths, namely, inductors L115 and L117; the physical key K22 is connected to the physical keys K19, K11, and K7 in the low-frequency path, and it is necessary to add isolating inductors L107 and L109; the physical key K4 is connected to the physical keys K19, K11, and K7 in the low-frequency path, but they are in different high-frequency paths, and it is necessary to add a second inductor 230 for isolation, namely, inductor L106; the physical keys K14, K15, and K16 are connected in the low-frequency path, and it is necessary to set isolating inductors L134 and L135 between each pair.

[0050] (5) A third capacitor 240 may also be included in the high frequency path of the system, specifically:

[0051] In other specific embodiments, only one high-frequency antenna signal terminal 130 for receiving high-frequency antenna signals may be provided in the electronic device, and correspondingly, one high-frequency antenna signal terminal for transmitting high-frequency antenna signals may also be provided, and all physical buttons in the electronic device form multiple high-frequency paths, which may be connected to one of the multiple high-frequency paths through one high-frequency antenna signal terminal 130. In this case, the near-field communication antenna system will also include a third capacitor 240, specifically:

[0052] The third capacitor 240 is disposed between two adjacent high-frequency paths among the plurality of high-frequency paths, and is used to connect the high-frequency antenna signal between the two adjacent high-frequency paths and block the low-frequency driving signal.

[0053] For example Figure 3 As shown, the physical key K3 and the physical key K4 belong to the inner circle path and the outer circle path respectively. When these two paths need to share a high-frequency antenna signal at a high-frequency antenna signal end, a third capacitor 240, namely capacitor C104, can be connected between the physical keys K3 and K4.

[0054] (6) In order to block the high-frequency antenna signal between the high-frequency path and the ground line, a third inductor 250 is provided in the system. Specifically:

[0055] In other embodiments, the physical button in the high-frequency antenna signal end system includes a power button, and the high-frequency path includes the power button, and a third inductor 250 is connected between the power button and the ground line.

[0056] For example Figure 4 The figure shows a circuit structure diagram of a power button K21 in an electronic device. In addition to the inductor L136 connected between the power button K21 and its driving signal, i.e., the power signal (PWRKEY), a third inductor 250, i.e., an inductor L137, is also connected between the power button K21 and the ground line (GND).

[0057] (7) A fourth capacitor 260 may also be included in the high frequency path of the system, specifically:

[0058] In a specific embodiment, in order to realize the connection between the power button and two adjacent physical buttons in the high-frequency path, the physical buttons adjacent to the power button in the high-frequency path are connected to a specific end through the fourth capacitor 260, and the power button is also connected to the specific end, so that the power button can be connected to the same end of the near-field communication antenna to realize the connection between the power button and the two adjacent physical buttons. Then the high-frequency path of the system also includes:

[0059] The fourth capacitor 260 is disposed between the physical button adjacent to the power button and the specific end, and is used to connect the high-frequency antenna signal between the adjacent physical button and the specific end, and block the low-frequency driving signal.

[0060] For example Figure 3 As shown, for the two physical buttons K22 and K20 adjacent to the power button K21, the two physical buttons K22 and K20 can be connected to a specific end (PWR_NFC) of the near-field communication antenna through capacitors C101 and C107, respectively, and the power button K21 is also connected to the specific end (PWR_NFC) of the near-field communication antenna, thereby realizing the connection between the power button K21 and the two adjacent physical buttons K22 and K20, respectively.

[0061] It can be seen that the near-field communication system in the embodiment of the present invention is mainly used in electronic devices deployed with multiple physical buttons. The high-frequency antenna signal end is set in the circuit where the physical buttons are located. There is no need to deploy the near-field communication antenna in a separate space, which saves space for near-field communication implementation. The first capacitor, the second capacitor, the first inductor and the second inductor are set in the internal circuit of the electronic device through the characteristics of the capacitor blocking low-frequency signals and passing high-frequency signals, and the inductor blocking high-frequency signals and passing low-frequency signals, 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.

[0062] The following is a specific application example to illustrate the near field communication antenna system of the present invention. Figures 2 to 4 As shown, the electronic device to which the near field communication antenna system in this embodiment is applied includes 24 physical keys K1 to K24, such as Figure 3 As shown, the NFC antenna deployed in the NFC antenna system is a thick black line connected around the physical button. The NFC antenna effect is achieved mainly by adding an inductor and capacitor filtering network in the circuit where the physical button is located, and connecting the outer circle of the physical button into a ring. Specifically, the NFC antenna of this embodiment includes:

[0063] The high-frequency antenna signal terminals NFC_3 and NFC_0 are high-frequency antenna signal input and output terminals, used to transmit and receive high-frequency antenna signals. The low-frequency drive signal terminals KROW0 to KROW4 (or KCOL0 to KCOL4) are used to transmit low-frequency drive signals.

[0064] Multiple physical keys K1 to K24, each physical key is connected to the corresponding low-frequency drive signal terminal KROW0 to KROW4 (or KCOL0 to KCOL4) to form a low-frequency path; at least one physical key K2 and K7 are connected to the high-frequency antenna signal terminals NFC_3 and NFC_0 respectively to connect the high-frequency antenna signal, and at least one physical key K2 and K7 is connected to the remaining other physical keys to form a high-frequency path.

[0065] The first inductor is arranged in the low-frequency path, and is used to connect the low-frequency driving signal in the low-frequency path and block the high-frequency antenna signal, that is, the inductor connected to each physical key, such as the inductor L124 connected to the physical key K2, the inductor L126 connected to the physical key K1, etc.

[0066] The first capacitors C110 and C102 are respectively arranged 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 to connect the high-frequency antenna signal between the high-frequency antenna signal terminal and the high-frequency path, and block the low-frequency driving signal between the high-frequency antenna signal terminal and the high-frequency path.

[0067] The second inductors L115, L117, L107, L109, L106, L134 and L135 are used to isolate high-frequency antenna signals between different high-frequency paths.

[0068] The second capacitors C114, C111, C108, C106, C101, C107, C105, C109, C113, C103, C115 and C112 are arranged in the high-frequency path to connect the high-frequency antenna signal in the high-frequency path and block the low-frequency driving signal to form a corresponding near-field communication antenna.

[0069] Furthermore, the near field communication antenna system also includes:

[0070] The third capacitor C104 is disposed between two adjacent high-frequency paths among the plurality of high-frequency paths, and is used to connect the high-frequency antenna signal between the two adjacent high-frequency paths and block the low-frequency driving signal.

[0071] The third inductor L137 is arranged between the power button K21 and the ground line.

[0072] 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 to connect the high-frequency antenna signals between the adjacent physical keys and the specific terminal and block the low-frequency driving signals.

[0073] Specifically, in the near field communication antenna system of this embodiment:

[0074] (1) Each physical key 100 is connected to the low-frequency driving signal terminal 120 to form a low-frequency path.

[0075] Physical keys K2, K1, K9, K17 and K24 can be connected to the same low-frequency drive signal terminal KROW3; physical keys K3, K8, K10, K18 and K23 can be connected to the same low-frequency drive signal terminal KROW1; physical keys K4, K7, K11, K19 and K22 can be connected to the same low-frequency drive signal terminal KROW0; physical keys K5, K6, K12, K13 and K20 can be connected to the same low-frequency drive signal terminal KROW2. Physical keys K14, K15 and K16 that need to be set separately can be connected to the same low-frequency drive signal terminal KROW4.

[0076] Each physical key can be driven by a different combination of KCOL and KROW signals. Specifically, to facilitate wiring settings, the physical keys on the same vertical or horizontal line are driven by the same KCOL or KROW signal to simplify the difficulty of key circuit settings. Figure 3As shown, the low-frequency drive signal of the low-frequency drive signal terminal KROW0 can drive the physical keys K4, K7, K11, K19 and K22; the low-frequency drive signal of the low-frequency drive signal terminal KROW1 can drive the physical keys K3, K8, K10, K18 and K23; the low-frequency drive signal of the low-frequency drive signal terminal KROW2 can drive the physical keys K5, K6, K12, K13 and K20; the low-frequency drive signal of the low-frequency drive signal terminal KROW3 can drive the physical keys K2, K1, K9, K17 and K24; the low-frequency drive signal of the low-frequency drive signal terminal KROW4 can drive the physical keys K14, K15 and K16. The low-frequency drive signal of the low-frequency drive signal terminal KCOL0 can drive the physical keys K4, K3, K13, K2 and K14; the low-frequency drive signal of the low-frequency drive signal terminal KCOL1 can drive the physical keys K11, K10, K12, K9 and K15; the low-frequency drive signal of the low-frequency drive signal terminal KCOL2 can drive the physical keys K22, K23, K5, K24 and K16; the low-frequency drive signal of the low-frequency drive signal terminal KCOL3 can drive the physical keys K19, K18, K20, and K17; the low-frequency drive signal of the low-frequency drive signal terminal KCOL4 can drive the physical keys K7, K8, K6, and K1.

[0077] (2) In the low-frequency path, corresponding first inductors may be connected between the low-frequency driving signal terminal 120 and the physical keys, so that each physical key is connected to a corresponding first inductor.

[0078] For example Figure 2 and Figure 3 As shown, in the key circuit, five inductors L108, L116, L123, L127 and L133 are added to the input of each low-frequency drive signal terminal KROW0 to KROW4; the first inductors connected to each physical key K1 to K24 are: inductors 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.

[0079] (3) The high-frequency path formed by multiple physical keys includes: the inner circle path: composed of physical keys K3, K8, K10, K15, K18, K19, K14, K11 and K7; the outer circle path: composed of physical keys K2, K1, K9, K16, K17, K24, K23, K22, K21, K20, K13, K12, K6, K5 and K4.

[0080] (4) In the high-frequency path, the output terminal NFC_0 and the input terminal NFC_3 of the high-frequency antenna signal are connected to the first capacitors C102 and C110 respectively, and the first capacitors C102 and C110 are connected to the physical keys K7 and K2 respectively. In this embodiment, the high-frequency path specifically includes an outer ring path and an inner ring path, wherein:

[0081] (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, the physical keys that are not connected in the low-frequency path are connected through the second capacitor, which can effectively prevent low-frequency signals and pass high-frequency signals. Specifically:

[0082] The physical keys K9 and K16 are connected via capacitor C114; the physical keys K16 and K17 are connected via capacitor C111; the physical keys K24 and K23, K23 and K22, K22 and K21, K21 and K20 are connected via capacitors C108, C106, C101 and C107 respectively; the physical keys K5 and K4 are connected via capacitor C105.

[0083] Among them, for the two physical buttons K22 and K20 adjacent to the power button K21, the physical buttons K22 and K20 are respectively connected to the specific end (PWR_NFC) of the near-field communication antenna through capacitors C101 and C107, and the power button K21 is also connected to the specific end (PWR_NFC) of the near-field communication antenna, thereby realizing the connection between the power button K21 and the two adjacent physical buttons K22 and K20.

[0084] (42) For the physical keys K3, K8, K10, K15, K18, K19, K14, K11 and K7 included in the inner circle path, these physical keys are connected through the second capacitor between the physical keys that are not connected in the low-frequency path, which can effectively prevent low-frequency signals and pass high-frequency signals. Specifically:

[0085] The physical keys K10 and K15, K15 and K18, K18 and K19, K19 and K14, and K14 and K11 are connected via capacitors C109, C113, C103, C115, and C112, respectively.

[0086] (5) In this embodiment, two high-frequency paths of the near-field communication antenna system share a high-frequency antenna signal terminal to input a high-frequency antenna signal, and the two high-frequency paths are connected via a third capacitor. Specifically:

[0087] A capacitor C104 is provided between the physical key K4 in the outer circle path and the physical key K3 in the inner circle path.

[0088] (6) A second inductor is used between different high-frequency paths to block the high-frequency antenna signal. Specifically:

[0089] Isolation inductors L115 and L117 are connected between the physical key K23 and the physical keys K18, K10, K8, and K3; isolation inductors L107 and L109 are connected between the physical key K22 and the physical keys K19, K11, and K7; isolation inductor L106 is connected between the physical key K4 and the physical keys K19, K11, and K7; isolation inductors L134 and L135 are connected in pairs between the physical keys K14, K15, and K16.

[0090] In addition, the inputs of the low-frequency driving signal terminals KROW0 to KROW4 are also connected to five inductors L108, L116, L123, L127 and L133 respectively to block the high-frequency antenna signal.

[0091] An embodiment of the present invention also provides an electronic device, in which multiple physical buttons and a near-field communication antenna system are deployed. The near-field communication antenna system reuses the circuits where the multiple physical buttons are located, wherein: the near-field communication antenna system is the near-field communication antenna system described in the above embodiment, which will not be described in detail here.

[0092] It should be noted that when deploying a near-field communication antenna system in an electronic device, it is necessary to add routing on the circuit board where the internal circuit of the electronic device is located, specifically adding routing for the high-frequency antenna signal end and the inductor and capacitor filtering network. Some routing is added directly to the surface of the circuit board, while some routing needs to be added to the inner layer of the circuit board in order to avoid other routing on the surface of the circuit board, so that the inner layer of the circuit board and the surface of the circuit board are connected.

[0093] For example Figure 2 As described above, the two trace ends 140 on the circuit board need to be directly connected, but if a directly connected trace is added directly on the surface of the circuit board, it will affect the capacitor C104, and a trace connecting the two trace ends 140 needs to be added on the inner layer of the circuit board.

[0094] A person skilled in the art may understand that all or part of the steps in the various methods of the above embodiments may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which may include: a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, etc.

[0095] The near-field communication antenna system and electronic device provided in the embodiments of the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A near field communication antenna system, characterized in that: include: A high frequency antenna signal terminal, used for transmitting and receiving high frequency antenna signals; A low-frequency driving signal terminal, used for transmitting a low-frequency driving signal; A plurality of physical buttons, each of which is connected to a corresponding low-frequency driving signal terminal to connect the low-frequency driving signal to form a low-frequency path; At least one physical button is respectively connected to the high-frequency antenna signal end to communicate with the high-frequency antenna signal, and the at least one physical button is connected to other physical buttons to form a high-frequency path; A first inductor is arranged in the low-frequency path, and is used to connect the low-frequency driving signal in the low-frequency path and block the high-frequency antenna signal; a first capacitor, disposed between the high-frequency antenna signal terminal and the at least one physical button, for connecting the high-frequency antenna signal between the high-frequency antenna signal terminal and the high-frequency path, and blocking the low-frequency driving signal between the high-frequency antenna signal terminal and the high-frequency path; A second inductor is used to isolate high-frequency antenna signals between different high-frequency paths; A second capacitor is disposed in the high-frequency path, and is used to connect the high-frequency antenna signal in the high-frequency path and block the low-frequency driving signal to form a corresponding near-field communication antenna; The high-frequency path includes an inner circle path, the inner circle path includes first physical keys arranged in the inner circle of the electronic device, and the first physical keys are connected in sequence according to the positions arranged in the inner circle of the electronic device; The high-frequency path includes an outer ring path, and the outer ring path includes second physical keys deployed in the outer ring of the electronic device. The second physical keys are connected in sequence according to the positions deployed in the outer ring of the electronic device.

2. The system according to claim 1, characterized in that The system includes a plurality of high-frequency antenna signal terminals, each of which is connected to a corresponding high-frequency path.

3. The system according to claim 1, characterized in that The system includes a high-frequency antenna signal terminal, the high-frequency antenna signal terminal is connected to a high-frequency path in a plurality of high-frequency paths, and the system also includes: The third capacitor is disposed between two adjacent high-frequency paths among the plurality of high-frequency paths, and is used to connect the high-frequency antenna signal between the two adjacent high-frequency paths and block the low-frequency driving signal.

4. The system according to claim 1, characterized in that The physical button includes a power button, and the high-frequency path includes the power button, and the system further includes: The third inductor is arranged between the power button and the ground line.

5. The system according to claim 4, characterized in that The physical buttons adjacent to the power button in the high-frequency path are respectively connected to a specific end; and the power button is connected to the specific end.

6. The system according to claim 5, characterized in that Also includes: The fourth capacitor is arranged between the physical button adjacent to the power button and the specific end, and is used to connect the high-frequency antenna signal between the adjacent physical button and the specific end and block the low-frequency driving signal.

7. The system according to claim 1, characterized in that The first inductor is connected between the low-frequency driving signal terminal and the physical key.

8. An electronic device, characterized in that: A plurality of physical buttons and a near field communication antenna system are deployed in the electronic device, and the near field communication antenna system reuses the circuits where the plurality of physical buttons are located, wherein: The near field communication antenna system is the near field communication antenna system as claimed in any one of claims 1 to 7.

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