Near field communication antenna system and method of setting the same

Abstract

The embodiment of the application discloses a near field communication antenna system and a setting method thereof, and is applied to the technical field of electronic equipment. The near field communication system is mainly applied to electronic equipment which is provided with multiple physical buttons. A high-frequency antenna signal end is arranged in a circuit where the physical buttons are located. When a high-frequency channel is arranged in the internal circuit of the electronic equipment, a first capacitor, a second capacitor and a first inductor are arranged to realize the high-frequency channel. The near field communication antenna formed by the high-frequency channel does not need to be arranged separately in space, internal circuit space is saved, and the capacitor and the inductor are arranged based on grouping of the physical buttons used when a low-frequency channel is generated, so that the high-frequency channel can be realized by using fewer capacitors and inductors. Meanwhile, due to the characteristics that the capacitor blocks low-frequency signals and transmits high-frequency signals, and the inductor blocks high-frequency signals and transmits low-frequency signals, the low-frequency channel for the physical buttons and the high-frequency channel for the near field communication antenna do not interfere with each other.

Description

Technical Field

[0001] This invention relates to the field of electronic equipment technology, and in particular to a near-field communication antenna system and its installation method. Background Technology

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

[0003] Currently, conventional NFC antennas typically use flexible printed circuit (FPC) windings to communicate with loop antennas, usually designed on the back of electronic devices or around the screen. However, some electronic devices have many physical button areas, and these areas cannot be used to deploy NFC antennas, making it impossible for these electronic devices to use NFC functionality. Summary of the Invention

[0004] This invention provides a near-field communication antenna system and its installation method, which enables the deployment of an NFC antenna in the physical button area of ​​an electronic device through a simplified circuit.

[0005] One embodiment of the present invention provides a near-field communication antenna system, comprising: 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; and the low-frequency receiving signal terminal is used to receive low-frequency drive signals. Multiple groups of physical buttons are formed by sequentially dividing the electronic device into an outer ring, a middle ring connecting the outer and inner rings, and physical buttons deployed in the inner ring. Each group of physical buttons includes the same number of physical buttons. Each physical button in each group of physical buttons and its corresponding first inductor are connected between the corresponding low-frequency drive signal terminal and low-frequency receiving signal terminal, forming a corresponding low-frequency path; wherein, each group of physical buttons is connected to the same low-frequency drive signal terminal, and each physical button in each group is connected to a different low-frequency receiving signal terminal. Two of the physical buttons are connected to the high-frequency antenna signal terminal through a first capacitor to connect to the high-frequency antenna signal. The two physical buttons and the other groups of physical buttons are connected through a second capacitor to form a high-frequency path consisting of physical buttons from the outer ring to the middle ring and then to the inner ring of the electronic device. The first inductor is used to connect the low-frequency drive signal in the low-frequency path and block the high-frequency antenna signal; The first capacitor is used to connect the high-frequency antenna signal between the high-frequency antenna signal terminal and the high-frequency path, and to block the low-frequency drive signal between the high-frequency antenna signal terminal and the high-frequency path. The second capacitor is used to connect the high-frequency antenna signal in the high-frequency path and block the low-frequency drive signal to form a corresponding near-field communication antenna.

[0006] Another aspect of the present invention provides a method for setting up a near-field communication antenna system, comprising: Based on the distribution of physical buttons in electronic devices, the physical buttons are divided into multiple groups from the outer ring of the electronic device, the middle ring connecting the outer ring and the inner ring, to the inner ring. Each group of physical buttons includes the same number of physical buttons. Each physical button in each group of physical buttons and its corresponding first inductor are connected between the corresponding low-frequency drive signal terminal and the low-frequency receiving signal terminal to form a low-frequency path. The first inductor is used to connect the low-frequency drive signal in the low-frequency path and block the high-frequency antenna signal. Two physical buttons from all the physical buttons are connected to the high-frequency antenna signal terminal through a first capacitor to connect the high-frequency antenna signal. The two physical buttons and other groups of physical buttons are connected through a second capacitor to form a high-frequency path composed of physical buttons from the outer ring to the middle ring and then to the inner ring of the electronic device. The first capacitor is used to connect the high-frequency antenna signal between the high-frequency antenna signal terminal and the high-frequency path, and to block the low-frequency drive signal between the high-frequency antenna signal terminal and the high-frequency path; the second capacitor is used to connect the high-frequency antenna signal in the high-frequency path and to block the low-frequency drive signal, so as to form a corresponding near-field communication antenna.

[0007] As can be seen, the near-field communication system in this embodiment of the invention is mainly applied to electronic devices with multiple physical buttons. The high-frequency antenna signal terminal is placed in the circuit where the physical buttons are located. When setting up a high-frequency path in the internal circuit of the electronic device, a first capacitor, a second capacitor, and a first inductor are used to achieve the high-frequency path. The near-field communication antenna formed by this high-frequency path does not require separate space deployment, saving internal circuit space. Furthermore, by setting the capacitors and inductors based on the grouping of physical buttons used to generate the low-frequency path, a high-frequency path can be achieved with fewer capacitors and inductors. Simultaneously, due to the characteristics of capacitors blocking low-frequency signals while passing high-frequency signals, and inductors blocking high-frequency signals while passing low-frequency signals, the use of the low-frequency path for the physical buttons and the use of the high-frequency path for the near-field communication antenna are independent of each other and do not interfere with each other. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of an electronic device equipped with a near-field communication antenna according to an embodiment of the present invention; Figure 2 This is a flowchart of a near-field communication antenna system provided in an embodiment of the present invention; Figure 3a This is a schematic diagram of multiple sets of button circuits in an electronic device as defined in an embodiment of the present invention; Figure 3b This is a circuit diagram of the power button in an electronic device as defined in an embodiment of the present invention; Figure 4 This is a specific wiring structure after deploying a near-field communication antenna inside an electronic device in a specific application embodiment of the present invention; Figure 5 This is a flowchart of a method for setting up a near-field communication antenna system according to an embodiment of the present invention. Detailed Implementation

[0010] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0011] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0012] This invention provides a near-field communication antenna system, mainly used in applications such as... Figure 1 In the electronic device 110 with multiple physical buttons 100 shown, such as an access control lock with physical buttons or a mobile phone with physical buttons, in this embodiment, the 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 reuses the circuit between the physical buttons 100 in the electronic device 110 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.

[0013] It should be noted that the deployment of physical buttons 100 mainly consists of two parts, namely, as follows: Figure 1 The diagram shows the external portion of the physical button 100 deployed on the casing of the electronic device 110 for user pressing, and the circuit connection portion of the physical button 100 deployed in the internal circuit system of the electronic device 110. Thus, when the user presses the external portion of the physical button 100, the external portion is connected to the circuit connection portion, thereby connecting the circuit containing the physical button 100. The physical button 100 described below in the near-field communication antenna system mainly refers to the circuit connection portion of the physical button 100 in the internal circuit system of the electronic device 110.

[0014] like Figure 2 As shown, the internal circuit system of the near-field communication antenna system in this embodiment of the invention includes: Multiple low-frequency drive signal terminals are used to transmit low-frequency drive signals.

[0015] Multiple low-frequency receiving signal terminals are used to receive low-frequency drive signals.

[0016] The high-frequency antenna signal terminal is used to transmit and receive high-frequency antenna signals.

[0017] Multiple groups of physical buttons 100 are formed by sequentially dividing the electronic device into an outer ring, a middle ring connecting the outer and inner rings, and physical buttons deployed in the inner ring. Each group of physical buttons includes the same number of physical buttons.

[0018] Each physical button in each group of physical buttons and its corresponding first inductor are connected between the corresponding low-frequency drive signal terminal and low-frequency receiver signal terminal, forming a corresponding low-frequency path; wherein, each group of physical buttons is connected to the same low-frequency drive signal terminal, and each physical button in each group is connected to a different low-frequency receiver signal terminal.

[0019] Two of the physical buttons are connected to the high-frequency antenna signal terminal via a first capacitor to connect to the high-frequency antenna signal. The two physical buttons and the other physical buttons are connected via a second capacitor to form a high-frequency path consisting of physical buttons from the outer ring to the middle ring and then from the middle ring to the inner ring of the electronic device.

[0020] The aforementioned first inductor 120 is disposed in the low-frequency path to connect the low-frequency drive signal in the low-frequency path and block the high-frequency antenna signal.

[0021] The first capacitor 130 is respectively disposed between the high-frequency antenna signal terminal and the two physical buttons 100, and is used to connect the high-frequency antenna signal between the high-frequency antenna signal terminal and the high-frequency path, and to block the low-frequency drive signal between the high-frequency antenna signal terminal and the high-frequency path.

[0022] The second capacitor 140 is disposed between any two adjacent physical buttons in the high-frequency path. It is used to connect the high-frequency antenna signal in the high-frequency path and block the low-frequency drive signal to form a corresponding near-field communication antenna.

[0023] In a specific embodiment of the near-field communication antenna system of the present invention: (1) The connection between the physical button and the low-frequency drive signal terminal and the low-frequency receiving signal terminal can mainly form a low-frequency path: Generally, to facilitate wiring and simplify the circuitry of physical buttons, multiple adjacent physical buttons can be driven by a single low-frequency drive signal, depending on their location within the electronic device. In this embodiment, these adjacent physical buttons form a group and can be connected to the same low-frequency drive signal terminal. Furthermore, some physical buttons are special, such as those requiring individual configuration; these can be connected to different low-frequency drive signal terminals. Here, the low-frequency drive signal refers to the low-frequency signal required to drive the physical buttons when they are in use.

[0024] Specifically, in this embodiment, the physical buttons deployed on the outer ring of the electronic device, the middle ring connecting the outer and inner rings, and the inner ring are sequentially divided into multiple groups of physical buttons, with each group containing the same number of physical buttons. Specifically, the physical button groups formed by the physical buttons on the outer ring of the electronic device are as follows: (K3, K4, K11, K15), (K16, K21, K22, K28), (K29), (K30, K31, K32), (K25, K24, K19, K18), (K13, K7, K6, K1); the physical button groups formed by the physical buttons on the middle ring are (K10, K27, K26, K8); and the physical button groups formed by the physical buttons on the inner ring are (K2, K5, K9, K12), (K14, K17, K20, K23).

[0025] When these physical buttons are connected to the low-frequency drive signal terminal, for example... Figure 3aThe physical buttons K3, K4, K11, and K15 shown can be connected to the same low-frequency drive signal terminal KROW0; physical buttons K16, K21, K22, and K28 can be connected to the same low-frequency drive signal terminal KROW3; physical buttons K30, K31, and K32 can be connected to the same low-frequency drive signal terminal KROW7; physical buttons K25, K24, K19, and K18 can be connected to the same low-frequency drive signal terminal KROW5; physical buttons K13, K7, K6, and K1 can be connected to the same low-frequency drive signal terminal KROW2; physical buttons K10, K27, K26, and K8 can be connected to the same low-frequency drive signal terminal KROW6; physical buttons K2, K5, K9, and K12 can be connected to the same low-frequency drive signal terminal KROW1; and physical buttons K14, K17, K20, and K23 can be connected to the same low-frequency drive signal terminal KROW4.

[0026] like Figure 3b As shown, the independently configured physical button K29 is the power button, which is connected between the power signal PWRKEY and ground GND.

[0027] It should be noted that the same set of physical buttons will be connected to different low-frequency receiving signal terminals KCOL. For example, a set of physical buttons K3, K4, K11 and K15 will be connected to low-frequency receiving signal terminals KCOL2, KCOL3, KCOL4 and KCOL5 respectively.

[0028] (2) The low-frequency path formed by the near-field communication antenna system in this embodiment includes: a low-frequency driving signal terminal, a low-frequency receiving signal terminal, a physical button and a first inductor, wherein each physical button corresponds to a low-frequency path.

[0029] In this embodiment, a first inductor is provided in the low-frequency path. This first inductor can pass low-frequency signals while blocking high-frequency signals. When a user presses the external part of a physical button from outside the electronic device, the external part of the physical button is connected to the circuit connection part, thereby connecting the circuit where the physical button 100 is located, i.e., the low-frequency path. Specifically, in the low-frequency path formed by each physical button, a first inductor 120 is connected between each physical button 100 and the corresponding low-frequency drive signal terminal, and between each physical button and the corresponding low-frequency receiving signal terminal.

[0030] In this situation, a low-frequency signal flows in the circuit where the physical button 100 is located. The low-frequency signal can be passed through the first inductor 120, so that the physical button 100 can be used normally. At this time, the high-frequency path will not be connected.

[0031] For example Figure 4As shown, for a set of physical buttons K3, K4, K11 and K15, they are all connected to the same low-frequency drive signal terminal KROW0, but are connected to different low-frequency receiving signal terminals KCOL2, KCOL3, KCOL4 and KCOL5 respectively. Specifically, the low-frequency drive signal from the low-frequency drive signal terminal KROW0 needs to pass through a first inductor L2, a physical button K3, and another first inductor L30 to the low-frequency receiving signal terminal KCOL2; the low-frequency drive signal from the low-frequency drive signal terminal KROW0 needs to pass through a first inductor L2, a physical button K4, and another first inductor L29 to the low-frequency receiving signal terminal KCOL3; the low-frequency drive signal from the low-frequency drive signal terminal KROW0 needs to pass through a first inductor L2, a physical button K11, and another first inductor L22 to the low-frequency receiving signal terminal KCOL4; and the low-frequency drive signal from the low-frequency drive signal terminal KROW0 needs to pass through a first inductor L2, a physical button K15, and another first inductor L10 to the low-frequency receiving signal terminal KCOL5.

[0032] It should be noted that since each group of physical buttons is connected to the same low-frequency drive signal terminal, a first inductor can be connected between one physical button in any group and its corresponding low-frequency drive signal terminal. The other physical buttons in that group can reuse this first inductor with their corresponding low-frequency drive signal terminals. For example, in a group of physical buttons K3, K4, K11, and K15, a first inductor L2 is connected between physical button K15 and the low-frequency drive signal terminal KROW0. The other physical buttons in the group K3, K4, and K11 can reuse this first inductor L2 with the low-frequency drive signal terminal KROW0.

[0033] In another set of physical buttons K16, K21, K22 and K28, a first inductor L41 is connected between physical button K16 and the low-frequency drive signal terminal KROW3. The other physical buttons K21, K22 and K28 in this set can reuse the first inductor L41 with the low-frequency drive signal terminal KROW3.

[0034] (3) The connection between the physical button and the high-frequency antenna signal terminal mainly forms a high-frequency path. In this embodiment, the near-field communication antenna system forms a high-frequency path consisting of the physical buttons from the outer ring to the middle ring and then to the inner ring of the electronic device. This path includes: the high-frequency antenna signal terminal, the first capacitor 130, the physical button 100, and the second capacitor 140. The high-frequency path formed in this way is equivalent to a near-field communication antenna.

[0035] The near-field communication antenna system of this embodiment may include a high-frequency path, which includes all the physical buttons. This high-frequency path can be driven mainly by a high-frequency antenna signal received by a high-frequency antenna signal terminal. Here, the high-frequency antenna signal mainly refers to the high-frequency signal required to drive the path of the near-field communication antenna to connect. For example... Figure 2 As shown, specifically: The high-frequency path includes physical buttons deployed from the outer ring to the inner ring in the electronic device. These physical buttons are connected sequentially according to their positions in the electronic device from the outer ring to the inner ring, namely, physical buttons K3, K4, K11, K15, K16, K21, K22, K28, K29, K30, K31, K32, K25, K24, K19, K18, K13, K7, K6, K1, and K2 in the outer ring, physical buttons K10, K27, K26, and K8 in the middle ring connecting the outer ring and the inner ring, and physical buttons K5, K9, K12, K14, K17, K20, and K23 in the inner ring.

[0036] For two physical buttons connected to the high-frequency antenna signal terminal, one physical button located on the outer ring of the electronic device and closer to the high-frequency antenna signal terminal, and one physical button on the inner ring, can be selected and connected to the high-frequency antenna signal terminal respectively through a first capacitor. For example Figure 2 As shown, physical buttons K2 and K23 are connected to the high-frequency antenna signal terminal through capacitors C1 and C12, respectively.

[0037] Regarding the connection between these two physical buttons and other groups of physical buttons: It should be noted that in the near-field communication antenna system of this embodiment, the high-frequency path reuses the connections between physical buttons that are already connected in the low-frequency path where the physical buttons are located. Thus, the second capacitor 140 is mainly connected between unconnected physical buttons in the low-frequency path where the physical buttons are located, so as to connect the various physical buttons in the high-frequency path. Specifically, a second capacitor 140 is connected between a physical button in any group of physical buttons and another physical button in an adjacent group of physical buttons.

[0038] For example Figure 4 As shown, a group of physical buttons K3, K4, K11, and K15 are already connected in the low-frequency path and can be directly reused. However, different groups of physical buttons are not connected in the low-frequency path and need to be connected through a second capacitor. Specifically: Physical button K15 in one group and physical button K16 in another group are connected via a second capacitor (C2); physical buttons K16, K21, K22, and K28 are already connected in the low-frequency path and can be directly reused; physical button K32 in one group and physical button K25 in another group are connected via another second capacitor (C5); physical buttons K30, K31, and K32 are already connected in the low-frequency path and can be directly reused; physical buttons K18 and K13, K1 and K2, and K2 and K10 require capacitors C6, C7, and C8 respectively for connection; physical buttons K25, K24, K19, and K18 are already connected in the low-frequency path and can be directly reused, etc.

[0039] In this way, since the high-frequency path reuses the existing connection of the physical buttons in the low-frequency path, to ensure that the use of the near-field communication antenna and the use of the physical buttons do not interfere with each other, the path using the near-field communication antenna uses a high-frequency signal, while the path using the physical buttons uses a low-frequency signal. When the near-field communication antenna in the electronic device is used, the high-frequency antenna signal is input from the high-frequency antenna signal input. The first capacitor and the second capacitor can effectively pass the high-frequency signal while blocking the low-frequency signal, so that the high-frequency path composed of all the physical buttons is connected through the capacitors, which can block the low-frequency signal when the physical buttons are used, so that the use of the physical buttons does not affect the use of the near-field communication antenna. When the physical buttons are used, the low-frequency drive signal is input from the low-frequency drive signal terminal, and the physical buttons are connected to the low-frequency receiving signal terminal through the first inductor, which can block the high-frequency signal when the high-frequency antenna signal terminal is used, so that the use of the near-field communication antenna does not affect the use of the physical buttons. This achieves that the signals of the low-frequency path using the physical buttons and the high-frequency path using the near-field antenna do not interfere with each other.

[0040] (4) In order to block the high-frequency antenna signal between the same group of physical buttons, a second inductor is also set between the physical buttons in some groups of physical buttons in the system, specifically: In other embodiments, the near-field communication antenna system includes a second inductor disposed between two physical buttons in at least one set of physical buttons, for blocking high-frequency antenna signals between the two physical buttons.

[0041] It should be noted that in order to connect the high-frequency paths between the multiple groups of physical buttons, some groups of physical buttons do not need to be directly connected to the high-frequency antenna signal, but these physical buttons are already connected in the low-frequency path. In this case, the connection in the low-frequency path cannot be reused, and the high-frequency antenna signal needs to be blocked between these physical buttons through a second inductor.

[0042] For example Figure 4The set of physical buttons K2, K5, K9 and K12 shown are already connected in the low-frequency path. However, in order to form a high-frequency path from the outer ring to the inner ring, physical button K2 does not need to directly transmit high-frequency antenna signals with the other physical buttons K5, K9 and K12 in the same set of physical buttons. Instead, inductor L3 is needed between physical buttons K2 and K5 to block the high-frequency antenna signals.

[0043] Another set of physical buttons K8, K10, K26 and K27 are already connected in the low-frequency path. However, in order to form a high-frequency path from the outer ring to the inner ring, physical button K8 does not need to directly transmit high-frequency antenna signals with the other physical buttons K10, K26 and K27 in this set of physical buttons. Instead, inductor L4 is needed between physical buttons K8 and K10 to block the high-frequency antenna signals.

[0044] (5) In order to block the high-frequency antenna signal between the high-frequency path and the ground wire, a third inductor is set in the system, specifically: In other embodiments, the physical buttons in the near-field communication antenna system include a power button, and the high-frequency path includes a power button, with a third inductor connected between the power button and the ground wire.

[0045] For example Figure 4 The diagram shows the circuit structure of the power button K29 in the electronic device. In addition to the inductor L13 connected between the power button K29 and its low-frequency drive signal, i.e., the power signal (PWRKEY), a third inductor L38 is also connected between the power button K29 and the ground wire (GND).

[0046] (6) Certain second capacitors in the high-frequency path of the system, specifically: In a specific embodiment, to achieve the connection between the power button and two adjacent physical buttons in the high-frequency path, each physical button adjacent to the power button in the high-frequency path is connected to a specific terminal through a second capacitor, and the power button is also connected to the specific terminal. Thus, by connecting them all to the same terminal of the near-field communication antenna, the connection between the power button and the two adjacent physical buttons can be achieved. Therefore, the high-frequency path of the system also includes: A second capacitor is installed between the physical button adjacent to the power button and a specific terminal. This capacitor connects the high-frequency antenna signal between the adjacent physical button and the specific terminal, while blocking low-frequency drive signals. For example Figure 4As shown, for the two physical buttons K28 and K30 adjacent to the power button K29, the two physical buttons K28 and K30 can be connected to a specific terminal (PWR_GND) of the near-field communication antenna through capacitors C3 and C4 respectively, and the power button K29 is also connected to the specific terminal (PWR_GND) of the near-field communication antenna, thereby realizing the connection between the power button K29 and the two adjacent physical buttons K28 and K30 respectively.

[0047] As can be seen, the near-field communication system in this embodiment of the invention is mainly applied to electronic devices with multiple physical buttons. The high-frequency antenna signal terminal is placed in the circuit where the physical buttons are located. When setting up a high-frequency path in the internal circuit of the electronic device, a first capacitor, a second capacitor, and a first inductor are used to achieve the high-frequency path. The near-field communication antenna formed by this high-frequency path does not require separate space deployment, saving internal circuit space. Furthermore, by setting the capacitors and inductors based on the grouping of physical buttons used to generate the low-frequency path, a high-frequency path can be achieved with fewer capacitors and inductors. Simultaneously, due to the characteristics of capacitors blocking low-frequency signals while passing high-frequency signals, and inductors blocking high-frequency signals while passing low-frequency signals, the use of the low-frequency path for the physical buttons and the use of the high-frequency path for the near-field communication antenna are independent of each other and do not interfere with each other.

[0048] The following is a specific application example to illustrate the near-field communication antenna system of this invention, such as... Figure 2 and Figure 4 As shown, the near-field communication antenna system in this embodiment is applied to an electronic device that includes 32 physical buttons K1 to K32, such as... Figure 2 As shown, the near-field communication antenna deployed in the near-field communication antenna system is a thick black line connected around the physical button. This near-field communication antenna effect is achieved primarily by adding an inductor and capacitor filter network to the circuit containing the physical button, creating a loop from the outer to the inner ring. Specifically, the near-field communication antenna in this embodiment includes: The high-frequency antenna signal terminals NFC1 and NFC2 are the high-frequency antenna signal input and output terminals, used for transmitting and receiving high-frequency antenna signals. The low-frequency drive signal terminals KROW0 to KROW7 are used for transmitting low-frequency drive signals. The low-frequency receive signal terminals KCOL2 to KCOL5 are used for receiving low-frequency drive signals.

[0049] Multiple physical buttons K1 to K32 are connected to the corresponding low-frequency drive signal terminals KROW0 to KROW7 and the corresponding low-frequency receiving signal terminals KCOL2 to KCOL5 to form a low-frequency path. Two physical buttons K3 and K23 are connected to the high-frequency antenna signal terminals NFC1 and NFC2 respectively to connect the high-frequency antenna signal. The two physical buttons K3 and K23 are connected to the remaining other groups of physical buttons to form a high-frequency path composed of physical buttons from the outer ring to the middle ring and then to the inner ring.

[0050] The first inductor is installed between each physical button and the low-frequency drive signal terminal, and between the physical button and the low-frequency receiving signal terminal in the low-frequency path. It is used to connect the low-frequency drive signal in the low-frequency path and block the high-frequency antenna signal. That is, the first inductor is connected to each physical button, such as the first inductors L30 and L2 connected to physical button K3, and the first inductor L29 connected to physical button K4, etc.

[0051] The first capacitors C1 and C12 are respectively located between the high-frequency antenna signal terminal NFC1 and the physical button K3, and between the high-frequency antenna signal terminal NFC2 and the physical button K23. They are used to connect the high-frequency antenna signal between the high-frequency antenna signal terminal and the high-frequency path, and to block the low-frequency drive signal between the high-frequency antenna signal terminal and the high-frequency path.

[0052] The second capacitors C2, C3, C4, C5, C6, C7, C8, C9, C10, and C11 are placed in the high-frequency path to connect the high-frequency antenna signal in the high-frequency path and block the low-frequency drive signal, so as to form the corresponding near-field communication antenna.

[0053] The second capacitors C3 and C4 are respectively located between the physical buttons K28 and K30 adjacent to the power button K29 and the specific terminal PWR_NFC. They are used to connect the high-frequency antenna signal between the adjacent physical button and the specific terminal and to block the low-frequency drive signal.

[0054] Specifically, in the near-field communication antenna system of this embodiment: (1) Each group of physical buttons 100 is connected to the low-frequency drive signal terminal and the low-frequency receiving signal terminal to form a low-frequency path.

[0055] Physical buttons K3, K4, K11, and K15 can be connected to the same low-frequency drive signal terminal KROW0; physical buttons K2, K5, K9, and K12 can be connected to the same low-frequency drive signal terminal KROW1; physical buttons K1, K6, K7, and K13 can be connected to the same low-frequency drive signal terminal KROW2; physical buttons K16, K21, K22, and K28 can be connected to the same low-frequency drive signal terminal KROW3; physical buttons K14, K17, K20, and K23 can be connected to the same low-frequency drive signal terminal KROW4; physical buttons K18, K19, K24, and K25 can be connected to the same low-frequency drive signal terminal KROW5; physical buttons K8, K10, K26, and K27 can be connected to the same low-frequency drive signal terminal KROW6; and physical buttons K30, K31, and K32 can be connected to the same low-frequency drive signal terminal KROW7. The power button K29, which requires separate configuration, is connected to the power signal PWRKEY.

[0056] To facilitate wiring setup, physical buttons on the same horizontal line are grouped together and use the same KROW signal. Within any group, each physical button uses a different KCOL signal, but physical buttons on the same vertical line use the same KCOL signal to simplify button circuit setup. For example... Figure 4 As shown, physical buttons K3, K2, K1, K16, K14, K18, K8, and K30 are connected to the same low-frequency receiving signal terminal KCOL2; physical buttons K4, K5, K6, K21, K17, K19, K10, and K31 are connected to the same low-frequency receiving signal terminal KCOL3; physical buttons K11, K9, K7, K22, K20, K24, K26, and K32 are connected to the same low-frequency receiving signal terminal KCOL4; and physical buttons K15, K12, K13, K28, K23, K25, and K27 are connected to the same low-frequency receiving signal terminal KCOL5.

[0057] (2) In the low-frequency path, a corresponding first inductor can be connected between the low-frequency drive signal terminal and the physical button, and between the physical button and the low-frequency receiving signal terminal, so that each physical button is connected to a corresponding first inductor.

[0058] For example Figure 2 and Figure 4As shown, in the button circuit, the inputs of each low-frequency drive signal terminal KROW0 to KROW7 are increased with first inductors L2, L43, L42, L41, L40, L39, L1 and L37; the first inductors connected to each physical button K1 to K32 are respectively: first inductors L32, L31, L30, L29, L28, L27, L20, L36, L21, L23, L22, L9, L8, L34, L10, L33, L25, L35, L24, L18, L26, L19, L6, L17, L5, L16, L11, L6, L7, L13, L12, L14 and L15.

[0059] (3) The high-frequency path formed by multiple physical buttons includes physical buttons from the outer ring to the middle ring and then to the inner ring, consisting of physical buttons K3, K4, K11, K15, K16, K21, K22, K28, K29, K30, K31, K32, K25, K24, K19, K18, K13, K7, K6, K1, K2, K10, K27, K26, K8, K5, K9, K12, K14, K17, K20 and K23.

[0060] (4) In the high-frequency path, the output terminal NFC1 and the input terminal NFC2 of the high-frequency antenna signal are respectively connected to the first capacitors C1 and C12, and the first capacitors C1 and C12 are then respectively connected to the physical buttons K3 and K23. In this embodiment, the high-frequency path specifically includes a path from the outer ring to the inner ring, wherein: The path from the outer ring to the inner ring includes physical buttons K3, K4, K11, K15, K16, K21, K22, K28, K29, K30, K31, K32, K25, K24, K19, K18, K13, K7, K6, K1, K2, K10, K27, K26, K8, K5, K9, K12, K14, K17, K20, and K23. Among these physical buttons, those not connected in the low-frequency path are connected via a second capacitor, effectively preventing low-frequency signals from passing through while allowing high-frequency signals to pass. Specifically: Physical buttons K15 and K16 are connected by capacitor C2; physical buttons K28 and K29 ​​are connected by capacitor C3; physical buttons K29 are connected to K30, K32 to K25, K13 to K18, K1 to K2, K2 to K10, K26 to K8, K8 to K5, and K12 to K14 by capacitors C4, C5, C6, C7, C8, C9, C10, and C11, respectively.

[0061] Specifically, for the two physical buttons K28 and K30 adjacent to the power button K29, physical buttons K28 and K30 are connected to a specific terminal (PWR_GND) of the near-field communication antenna through capacitors C3 and C4, respectively, and the power button K29 is also connected to this specific terminal (PWR_GND) of the near-field communication antenna, thereby realizing the connection between the power button K29 and the two adjacent physical buttons K28 and K30.

[0062] (5) Connect the high-frequency paths between the multiple groups of physical buttons formed by the division. Some groups of physical buttons do not need to be directly connected to the high-frequency antenna signal, but these physical buttons are already connected in the low-frequency path. In this case, the connection in the low-frequency path cannot be reused, and the high-frequency antenna signal needs to be blocked between these physical buttons through a second inductor. Specifically: For example Figure 4 The set of physical buttons K2, K5, K9, and K12 shown is already connected in the low-frequency path. However, in order to form a high-frequency path from the outer ring to the inner ring, physical button K2 does not need to directly transmit high-frequency antenna signals with the other physical buttons K5, K9, and K12 in this set. Instead, an inductor L3 is needed between physical buttons K2 and K5 to block the high-frequency antenna signals. Similarly, another set of physical buttons K8, K10, K26, and K27 is already connected in the low-frequency path. However, in order to form a high-frequency path from the outer ring to the inner ring, physical button K8 does not need to directly transmit high-frequency antenna signals with the other physical buttons K10, K26, and K27 in this set. Instead, an inductor L4 is needed between physical buttons K8 and K10 to block the high-frequency antenna signals.

[0063] This 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. The near-field communication antenna system is the same as the near-field communication antenna system described in the above embodiments, and will not be described in detail here.

[0064] It should be noted that when deploying a near-field communication antenna system in an electronic device, it is necessary to add traces on the circuit board containing the internal circuitry of the electronic device. Specifically, traces need to be added for the high-frequency antenna signal terminal and the first inductor and capacitor filter network. Some traces are added directly to the surface of the circuit board, while others need to be added to the inner layer of the circuit board to avoid other traces on the surface of the circuit board, thus connecting the inner layer of the circuit board to the surface of the circuit board.

[0065] For example Figure 2 As mentioned above, the two traces between the physical button K23 and the capacitor C12 on the circuit board need to be connected. However, if a direct connection trace is added directly to the surface of the circuit board, it will affect the physical button K9. Therefore, a trace connecting the two traces needs to be added to the inner layer of the circuit board.

[0066] This invention provides a method for setting up a near-field communication antenna system, mainly a method for setting up the aforementioned near-field communication antenna system, the flowchart of which is shown below. Figure 5 As shown, it includes: Step 101: Based on the distribution of physical buttons in the electronic device, the physical buttons deployed from the outer ring of the electronic device, the middle ring connecting the outer ring and the inner ring, to the inner ring are divided into multiple groups of physical buttons, with each group of physical buttons including the same number of physical buttons.

[0067] It is understood that in this embodiment of the invention, it is necessary to divide the physical buttons into multiple groups according to the distribution of physical buttons in the electronic device, and then set the low-frequency path and high-frequency path between these multiple groups of physical buttons.

[0068] Specifically, regarding such as Figure 1 The distribution of physical buttons on the electronic device shown can be divided as follows: The physical button groups formed by the physical buttons on the outer ring of the electronic device are as follows: (K3, K4, K11, K15), (K16, K21, K22, K28), (K29), (K30, K31, K32), (K25, K24, K19, K18), (K13, K7, K6, K1); the physical button groups formed by the physical buttons on the middle ring are (K10, K27, K26, K8); and the physical button groups formed by the physical buttons on the inner ring are (K2, K5, K9, K12), (K14, K17, K20, K23).

[0069] Step 102: Connect each physical button in each group of physical buttons and its corresponding first inductor between the corresponding low-frequency drive signal terminal and low-frequency receiving signal terminal to form a low-frequency path. The first inductor is used to connect the low-frequency drive signal in the low-frequency path and block the high-frequency antenna signal.

[0070] To facilitate wiring and simplify the low-frequency circuitry of physical buttons, multiple adjacent physical buttons can be driven by a low-frequency drive signal emitted from a single low-frequency drive signal terminal, depending on their location within the electronic device. In this embodiment, these multiple adjacent physical buttons form a group of physical buttons that can be connected to the same low-frequency drive signal terminal, while each physical button in the same group is connected to a different low-frequency receiving signal terminal.

[0071] like Figure 3a As shown, a set of physical buttons K3, K4, K11 and K15 can be connected to the same low-frequency drive signal terminal KROW0, and to low-frequency receiving signal terminals KCOL2, KCOL3, KCOL4 and KCOL5 respectively.

[0072] Specifically, in the low-frequency path formed by each physical button, a first inductor is connected between each physical button and its corresponding low-frequency drive signal terminal, and between each physical button and its corresponding low-frequency receiving signal terminal. When a user presses the external part of a physical button from outside the electronic device, the external part of the physical button is connected to the circuit connection part, thereby connecting the circuit where the physical button is located, i.e., the low-frequency path.

[0073] like Figure 4 As shown, the low-frequency drive signal from the low-frequency drive signal terminal KROW0 needs to pass through a first inductor L2, a physical button K3, and another first inductor L30 to reach the low-frequency receiving signal terminal KCOL2; the low-frequency drive signal from the low-frequency drive signal terminal KROW0 needs to pass through a first inductor L2, a physical button K4, and another first inductor L29 to reach the low-frequency receiving signal terminal KCOL3, etc.

[0074] Step 103: Connect two physical buttons from all the physical buttons to the high-frequency antenna signal terminal through the first capacitor to connect the high-frequency antenna signal. Connect the two physical buttons and other groups of physical buttons through the second capacitor to form a high-frequency path composed of physical buttons from the outer ring to the middle ring and then to the inner ring of the electronic device.

[0075] The first capacitor is used to connect the high-frequency antenna signal between the high-frequency antenna signal terminal and the high-frequency path, and to block the low-frequency drive signal between the high-frequency antenna signal terminal and the high-frequency path; the second capacitor is used to connect the high-frequency antenna signal in the high-frequency path and to block the low-frequency drive signal, so as to form a corresponding near-field communication antenna.

[0076] Specifically, for the two physical buttons connected to the high-frequency antenna signal terminal, one physical button located on the outer ring of the electronic device and closer to the high-frequency antenna signal terminal, and one physical button on the inner ring, can be selected and connected to the high-frequency antenna signal terminal through a first capacitor, respectively. For example... Figure 2 As shown, physical buttons K2 and K23 are connected to the high-frequency antenna signal terminal through capacitors C1 and C12, respectively.

[0077] Regarding the connection between these two physical buttons and other groups of physical buttons, the connections between already connected physical buttons in the low-frequency path where the physical buttons are located are reused when setting up the high-frequency path. Thus, the second capacitor is mainly connected between unconnected physical buttons in the low-frequency path where the physical buttons are located, to connect the various physical buttons in the high-frequency path. Specifically: a second capacitor is connected between a physical button in any group and another physical button in an adjacent group.

[0078] For example Figure 4As shown, physical button K15 in one group and physical button K16 in another group are connected through a second capacitor (i.e., C2); physical buttons K16, K21, K22 and K28 are already connected in the low-frequency path and can be directly reused, etc.

[0079] Furthermore, when connecting the high-frequency paths between the multiple groups of physical buttons, some groups of physical buttons do not need to be directly connected to the high-frequency antenna signal, but these physical buttons are already connected in the low-frequency path. In this case, the connection in the low-frequency path cannot be reused, and the high-frequency antenna signal needs to be blocked between these physical buttons through a second inductor. For example Figure 4 The set of physical buttons K2, K5, K9 and K12 shown are already connected in the low-frequency path. However, in order to form a high-frequency path from the outer ring to the inner ring, physical button K2 does not need to directly transmit high-frequency antenna signals with the other physical buttons K5, K9 and K12 in the same set of physical buttons. Instead, an inductor L3 is needed between physical buttons K2 and K5 to block the high-frequency antenna signals.

[0080] The near-field communication antenna system and its setting method provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A near-field communication antenna system, characterized in that, include: 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. The low-frequency receiving signal terminal is used to receive low-frequency drive signals; Multiple groups of physical buttons are formed by sequentially dividing the electronic device into an outer ring, a middle ring connecting the outer and inner rings, and physical buttons deployed in the inner ring. Each group of physical buttons includes the same number of physical buttons. Each physical button in each group of physical buttons and its corresponding first inductor are connected between the corresponding low-frequency drive signal terminal and low-frequency receiving signal terminal, forming a corresponding low-frequency path; wherein, each group of physical buttons is connected to the same low-frequency drive signal terminal, and each physical button in each group is connected to a different low-frequency receiving signal terminal. Two of the physical buttons are connected to the high-frequency antenna signal terminal through a first capacitor to connect to the high-frequency antenna signal. The two physical buttons and the other groups of physical buttons are connected through a second capacitor to form a high-frequency path consisting of physical buttons from the outer ring to the middle ring and then to the inner ring of the electronic device. The first inductor is used to connect the low-frequency drive signal in the low-frequency path and block the high-frequency antenna signal; The first capacitor is used to connect the high-frequency antenna signal between the high-frequency antenna signal terminal and the high-frequency path, and to block the low-frequency drive signal between the high-frequency antenna signal terminal and the high-frequency path. The second capacitor is used to connect the high-frequency antenna signal in the high-frequency path and block the low-frequency drive signal to form a corresponding near-field communication antenna.

2. The system as described in claim 1, characterized in that, The first inductor is connected between each physical button and its corresponding low-frequency drive signal terminal, and between each physical button and its corresponding low-frequency receiving signal terminal.

3. The system as described in claim 2, characterized in that, One physical button in any group of physical buttons is connected to the first inductor via a corresponding low-frequency drive signal terminal, and the other physical buttons in any group of physical buttons share the first inductor with their corresponding low-frequency drive signal terminals.

4. The system as described in claim 1, characterized in that, Also includes: A second inductor is disposed between two physical buttons in at least one set of physical buttons to block the high-frequency antenna signal between the two physical buttons.

5. The system according to any one of claims 1 to 4, characterized in that, A second capacitor is connected between a physical button in any group of physical buttons and another physical button in an adjacent group of physical buttons.

6. The system according to any one of claims 1 to 4, characterized in that, The physical buttons include a power button, and the high-frequency path includes the power button. The system also includes: The third inductor is located between the power button and the ground wire.

7. The system as described in claim 6, characterized in that, Each physical button in the high-frequency path adjacent to the power button is connected to a specific terminal; the power button is connected to the specific terminal.

8. The system as described in claim 7, characterized in that, A second capacitor is provided between the physical button adjacent to the power button and the specific terminal to connect the high-frequency antenna signal between the adjacent physical button and the specific terminal, and to block the low-frequency drive signal.

9. The system according to any one of claims 1 to 4, characterized in that, The high-frequency path routing on the circuit board containing the internal circuitry of the electronic device includes routing on the surface of the circuit board and routing on the inner layers of the circuit board.

10. A method for setting up a near-field communication antenna system, characterized in that, include: Based on the distribution of physical buttons in electronic devices, the physical buttons are divided into multiple groups from the outer ring of the electronic device, the middle ring connecting the outer ring and the inner ring, to the inner ring. Each group of physical buttons includes the same number of physical buttons. Each physical button in each group of physical buttons and its corresponding first inductor are connected between the corresponding low-frequency drive signal terminal and the low-frequency receiving signal terminal to form a low-frequency path. The first inductor is used to connect the low-frequency drive signal in the low-frequency path and block the high-frequency antenna signal. Two physical buttons are connected to the high-frequency antenna signal terminal through a first capacitor to connect the high-frequency antenna signal. The two physical buttons and other groups of physical buttons are connected through a second capacitor to form a high-frequency path consisting of physical buttons from the outer ring to the middle ring and then to the inner ring of the electronic device. The first capacitor is used to connect the high-frequency antenna signal between the high-frequency antenna signal terminal and the high-frequency path, and to block the low-frequency drive signal between the high-frequency antenna signal terminal and the high-frequency path. The second capacitor is used to connect the high-frequency antenna signal in the high-frequency path and block the low-frequency drive signal to form a corresponding near-field communication antenna.

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