Electronic device

Abstract

An electronic device is provided. The electronic equipment comprises a first radiation branch knot which is provided with a first grounding point and a first feeding point; the second radiation branch knot is provided with a second grounding point and a second feeding point; the near field communication chip is provided with a first differential signal end and a second differential signal end which are used for providing differential excitation current; the first matching circuit is provided with a first connecting end, a second connecting end and a third grounding end, the first connecting end is electrically connected with the first feeding point, the second connecting end is electrically connected with the first differential signal end, the third grounding end is grounded, and the first matching circuit is used for matching impedance when the first radiation branch transmits the differential excitation current; the second matching circuit is provided with a third connecting end, a fourth connecting end and a fourth grounding end, the third connecting end is electrically connected with the second feeding point, the fourth connecting end is electrically connected with the second differential signal end, the fourth grounding end is grounded, and the second matching circuit is used for matching impedance when the second radiation branch transmits the differential excitation current.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of wireless communication technology, and more specifically, to an electronic device. Background Art

[0002] With the development of communication technology, electronic devices not only have the ability to communicate wirelessly with cellular mobile networks, but also have near field communication (NFC) functions. The space that antennas can occupy in electronic devices is getting smaller and smaller, and NFC antennas are usually required to cover non-near field communication functions at the same time. NFC antennas with dual grounded antenna branches are a commonly used solution. If any of the dual grounded antenna branches is broken or cannot work normally due to the influence of the surrounding environment, there is a problem of NFC function failure. Summary of the invention

[0003] The embodiment of the present application provides an electronic device. The following introduces aspects involved in the embodiment of the present application.

[0004] In a first aspect, a foldable electronic device is provided, comprising: a first radiation branch having a first grounding point and a first feeding point, the first grounding point being grounded; a second radiation branch having a second grounding point and a second feeding point, the second grounding point being grounded; a near field communication chip having a first differential signal terminal and a second differential signal terminal, the first differential signal terminal and the second differential signal terminal being used to provide a differential excitation current; a first matching circuit having a first connection terminal, a second connection terminal and a third grounding terminal, the first connection terminal being electrically connected to the first feeding point, the second connection terminal being electrically connected to the first differential signal terminal, the third grounding terminal being grounded, the first matching circuit being used to match the impedance when the first radiation branch transmits the differential excitation current; a second matching circuit having a third connection terminal, a fourth connection terminal and a fourth grounding terminal, the third connection terminal being electrically connected to the second feeding point, the fourth connection terminal being electrically connected to the second differential signal terminal, the fourth grounding terminal being grounded, and the second matching circuit being used to match the impedance when the second radiation branch transmits the differential excitation current.

[0005] In the embodiment of the present application, the first matching circuit and the second matching circuit are isolated by the grounding point so that the two radiating branches do not interfere with each other, and the two radiating branches can be adjusted separately to meet the requirements of the NFC antenna. Since the matching circuits of the two radiating branches are isolated, the two radiating branches can form a return path for the differential excitation current respectively. Even if one radiating branch fails, the other radiating branch is not affected, and the normal operation of the NFC antenna can be ensured. The embodiment of the present application helps to avoid the failure of the NFC function of the whole machine due to the failure of a radiating branch, and helps to improve the communication experience of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of a matching circuit for a coil NFC antenna.

[0007] Figure 2 A schematic diagram of an NFC antenna with dual grounded antenna branches.

[0008] Figure 3 yes Figure 2 Schematic diagram of a matching circuit for an NFC antenna.

[0009] Figure 4 yes Figure 3 Resonance diagram of the NFC antenna.

[0010] Figure 5 It is a schematic diagram of a component unit / partial component unit of an electronic device provided in an embodiment of the present application.

[0011] Figure 6 yes Figure 5 A schematic structural diagram of a possible implementation of an electronic device.

[0012] Figure 7 yes Figure 6 Schematic diagram of a resonant frequency adjustment of the radiation branch.

[0013] Figure 8 yes Figure 6 Schematic diagram of another resonant frequency adjustment of the radiation branch.

[0014] Fig. 9 yes Figure 5 A schematic structural diagram of another possible implementation of an electronic device.

[0015] Fig.10 yes Figure 5 A schematic structural diagram of yet another possible implementation of an electronic device. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0017] It should be understood that the electronic device in the embodiment of the present application may also be referred to as a terminal device, terminal, user equipment (UE), user terminal, access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote terminal, remote station, mobile device, wireless communication device, user agent or user device. The terminal device in the embodiment of the present application may be a device that provides voice and / or data connectivity to a user, and can be used to connect people, objects and machines, such as a handheld device with a wireless connection function, a vehicle-mounted device, etc. The terminal device in the embodiment of the present application can be a mobile phone, a tablet computer, a laptop, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. Optionally, the UE can be used to act as a base station. For example, the UE can act as a scheduling entity that provides sidelink signals between UEs in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using a sidelink signal. The cellular phone and the smart home device communicate with each other without relaying the communication signal through the base station.

[0018] With the development of communication technology, electronic devices such as smartphones can realize more and more functions, and the communication modes of electronic devices are also more diversified. For example, electronic devices not only have the ability to communicate wirelessly with cellular mobile networks, but in recent years, electronic devices can gradually realize near field communication (NFC) functions.

[0019] Antennas are one of the important components of wireless communication products. They are used to convert electrical signals into electromagnetic waves and transmit them into the air. At the same time, they can receive electromagnetic waves in the air and convert them into electrical signals. However, as electronic devices have more and more functions, the space occupied by antennas in electronic devices is getting smaller and smaller. It is necessary to design antenna components with compact structures, and it is expected that antennas cover a larger number of communication bands. For example, it may be expected that antennas cover near-field communication bands and additional non-near-field (far-field) communication bands, such as cellular communication bands, wireless local area network bands, and satellite communication bands.

[0020] Related art discloses an electronic device having a shared antenna structure and a balanced-unbalanced converter. The electronic device may have a shared antenna structure that can be used for both near field communication and non-near field communication. The near field communication circuit may be coupled to the antenna structure using a balanced-unbalanced converter. The balanced-unbalanced converter may have an electromagnetically coupled first inductor and a second point inductor. The second inductor may have two terminals coupled to the differential signal end of the near field communication transceiver, and the first inductor may form a part of the near field communication loop antenna. Since a balanced-unbalanced converter is used in the matching network, it is quite different from the traditional coil NFC antenna matching circuit, and the near field communication circuit board cannot be reused, which is not conducive to the evaluation of the solution. Furthermore, when the NFC antenna branch is broken, the NFC function will fail. In addition, the price of the balanced-unbalanced converter is higher than that of the patch device, which is not conducive to cost control.

[0021] The coil NFC antenna is a common design of near field communication antenna, which is usually placed between the screen and the printed circuit board (PCB). A matching circuit is usually set between the coil NFC antenna and the NFC chip. Figure 1 This is a schematic diagram of a matching circuit for a coil NFC antenna. Figure 1 As shown, a filter circuit 130 and a matching circuit 140 may be provided between the coil NFC antenna 110 and the NFC chip 120. The two branches of the filter circuit 130 have the same matching value, which may include the same inductance L1 and C0; the two branches of the matching circuit 140 have the same matching value, which may include the same capacitance C1 and C2, and C2 may include a parallel capacitor C 21 and C 22 ; Capacitors C0, C 21 and C 22 The matching circuit 140 does not include a balanced-unbalanced converter. The excitation current of the near field communication chip 120 can start from the positive electrode (TX1), pass through the filter circuit 130, the matching circuit 140, and the coil antenna 110 and return to the negative electrode (TX2), forming a current loop. If any position of the coil NFC antenna is broken, the NFC function will fail.

[0022] The related art discloses another near field communication antenna with dual grounded antenna branches. Figure 2 is a schematic diagram of an NFC antenna with two grounded antenna branches. Figure 2 As shown, the radio frequency system includes: a first antenna branch 210, a second antenna branch 220 and a near field communication chip 230. The near field communication antenna adopts differential feeding, including a first antenna branch 210 and a second antenna branch 220. The near field communication chip 230 can be a near field communication transceiver. The first antenna branch 210 is connected to the positive pole of the near field communication chip 230, and the second antenna branch 220 is connected to the negative pole of the near field communication chip 230. There is no need for a balanced-unbalanced converter, and the first antenna branch 210 and the second antenna branch 220 of the near field communication need to be connected to a common ground. As shown Figure 2 As shown by the dotted line in , the excitation current of the near field communication chip 230 starts from the positive electrode, passes through the first antenna branch 210, the common ground, the second antenna branch 220 and returns to the negative electrode.

[0023] In a near-field communication antenna with dual grounded antenna branches, the two antenna branches are not necessarily the same length and have different equivalent inductances, which makes it easy for the two antenna branches to resonate at different frequencies. For optimization and debugging, there is usually only one resonance. Figure 3 yes Figure 2 Schematic diagram of a matching circuit for an NFC antenna. Figure 3 As shown, endpoint A is connected to the feeding point of the first antenna branch 210, and endpoint B is connected to the feeding point of the second antenna branch 220. A filter circuit 250 and a matching circuit 240 can be set between the two antenna branches and the NFC chip 230. The matching values ​​of the two branches (upper and lower branches) of the filter circuit 250 are the same, and can include the same inductance L0 and C0, where the capacitor C0 is connected to the ground in parallel. The matching values ​​of the two branches (upper and lower branches) of the matching circuit 240 are the same, and can include the same capacitors C1 and C2, and the capacitors C2 of the two branches are connected. Figure 4 yes Figure 3 Resonance diagram of the NFC antenna. It can be seen that there is only one resonant frequency point (such as 13.56MHz). The excitation current can only be from one end (positive pole) of the NFC circuit (near field communication chip 230), the first antenna branch 210, the motherboard ground (or middle frame ground), the second antenna branch 220 to the other end (negative pole) of the NFC circuit. There is only one current loop and only one resonance. This solution is the mainstream solution for the current dual-branch NFC antenna. However, when any antenna branch is broken, or any antenna branch cannot work normally due to the influence of the surrounding environment, the resonant frequency deviation of the antenna is serious, resulting in failure of the NFC function.

[0024] Take mobile phones as an example. The update speed of mobile phone products is getting faster and faster. Folding phones have become the first choice of many users because of their small size, flexible use, beautiful appearance and tablet-like experience. At present, folding phones are mainly divided into two types: horizontal folding and vertical folding. One is a large-screen mobile phone that folds horizontally to the left and right. It unfolds into a large screen similar to a tablet. After folding, it can have the screen experience of a regular straight-screen mobile phone. The other is a small-screen mobile phone that folds vertically up and down. It unfolds into a regular straight-screen mobile phone. After folding, it has a small-sized secondary screen experience. The secondary screen can realize infrequently used functions such as time, messages, and navigation.

[0025] Different from the application scenarios of traditional straight-bar mobile phone antennas, the antenna design of foldable mobile phones also needs to consider the performance changes of the antenna in the folded state. For example, in some foldable mobile phones, the NFC antenna solution with dual grounded antenna branches described above is used. If any antenna branch cannot work properly in the folded (or unfolded) state due to the influence of the surrounding metal environment, the NFC function will fail in the folded (or unfolded) state.

[0026] It can be seen that when any of the branches of the dual ground antenna is broken or cannot work normally due to the influence of the surrounding environment, there is a problem that the NFC function is prone to failure.

[0027] Therefore, it is necessary to design an arrangement scheme of the NFC antenna in which the NFC function is not easily affected by any branch breakage or failure.

[0028] It should be noted that the above-mentioned problem that any part of the foldable mobile phone fails to work normally after being folded, resulting in the failure of the NFC function is only an example. The embodiments of the present application can be applied to any type of scenario in which any part of the NFC antenna of an electronic device fails to work normally, resulting in the failure of the NFC function.

[0029] Based on this, an embodiment of the present application proposes an electronic device. Figure 5 Schematic diagram of component units / partial component units of the electronic device provided in the embodiment of the present application. Figure 5 The electronic device of the embodiment of the present application is described in detail. Figure 5 As shown, the electronic device 500 may include: a first radiation branch 510 , a second radiation branch 520 , a near field communication chip 530 , a first matching circuit 540 , and a second matching circuit 550 .

[0030] The first radiation branch 510 has a first grounding point and a first feeding point. The first grounding point is grounded, that is, the first grounding point is connected to a common ground. The common ground may also be called a reference ground, a ground plane, a ground surface, or a ground plane. The common ground may be a ground layer on a circuit board, a metal structure, or other conductive internal ground.

[0031] The radiation branch is also called a radiator, an antenna branch, or a branch. The first radiation branch 510 is used to transmit and receive radio frequency signals of a target working frequency band. The target working frequency band may be a near field communication frequency band (frequency band), and the near field communication frequency band may be, for example, a 13.56 MHz frequency band or other near field communication frequency bands.

[0032] The first radiating branch 510 may be a loop antenna, an inverted-F antenna, a strip antenna, a T-type antenna, a slot antenna, a hybrid antenna including more than one type of antenna structure, or other suitable antenna structures.

[0033] The first radiation branch 510 can be implemented by metal traces on a printed circuit or other dielectric substrate, a metal shell structure, or other conductive shell structures. For example, the first radiation branch 510 can be composed of a metal branch with a slit in the middle frame, one end of the first radiation branch 510 is grounded through the middle frame, and the other end is disconnected from the middle frame. The first grounding point on the first radiation branch 510 can be electrically connected to the metal traces, metal parts and common ground on the printed circuit or other dielectric substrate through a spring, a metal connecting material, a metal screw, a conductive glue / foam. In some implementations, the metal traces can be made in any of the following ways: flexible printed circuit (FPC), laser printing metal forming, printing direct structuring (PDS). Among them, laser printing metal forming is also called laser direct structuring (LDS) process, and PDS is also called direct pad printing process.

[0034] The second radiation branch 520 has a second grounding point and a second feeding point, and the second grounding point is grounded. The second radiation branch 520 is used to receive and transmit radio frequency signals in a target working frequency band, which may be, for example, a near field communication 13.56 MHz frequency band.

[0035] The near field communication chip 530 is also called a near field communication transceiver. The near field communication chip 530 has a first differential signal terminal 531 and a second differential signal terminal 532, and the first differential signal terminal 531 and the second differential signal terminal 532 are used to provide a differential excitation current.

[0036] The differential excitation current includes two current signals. The two current signals have the same amplitude and opposite phases, or it can be understood that the two current signals differ in phase by 180 degrees. In addition, the differential excitation current is a balanced signal. It can be understood that during the transmission process, if the analog signal is directly transmitted, it is an unbalanced signal; if the original analog signal is inverted, and then the inverted analog signal and the original analog signal are transmitted at the same time, the inverted analog signal and the original analog signal are called balanced signals. Compared with unbalanced signals, balanced signals have better anti-interference performance.

[0037] The near field communication chip 530 includes a first differential signal terminal 531 and a second differential signal terminal 532. For example, the first differential signal terminal 531 may be a positive (+) port, and the second differential signal terminal 532 may be a negative (-) port. For example, the differential excitation current provided by the near field communication chip 530 may be output via the first differential signal terminal 531, and flow back to the near field communication chip 530 via the second differential signal terminal 532, thereby forming a current loop.

[0038] For example, the first differential signal terminal 531 is electrically connected to the first feeding point of the first radiation branch 510, and the second differential signal terminal 532 is electrically connected to the second feeding point of the second radiation branch 520. Thus, the first differential signal terminal 531, the first radiation branch 510, the second radiation branch 520, and the second differential signal terminal 532 can form a signal loop. It can be understood that when the first radiation branch 510 transmits a differential excitation current, it can radiate an NFC signal to the outside world, thereby realizing the NFC function of the electronic device 500. Similarly, when the second radiation branch 520 transmits a partial differential excitation current, it can radiate an NFC signal to the outside world. Therefore, the first radiation branch 510 and the second radiation branch 520 can be used as NFC antennas to realize the NFC function of the electronic device 500.

[0039] The first matching circuit 540 has a first connection terminal 541, a second connection terminal 542 and a third ground terminal 543. The first connection terminal 541 is electrically connected to the first feeding point, the second connection terminal 542 is electrically connected to the first differential signal terminal 531, and the third ground terminal 543 is grounded. The first matching circuit 540 is used to match the impedance of the first radiation branch 510 when transmitting the differential excitation current. In some implementations, the first matching circuit 540 can transmit part of the differential excitation current through the third ground terminal 543 to provide a return path for part of the differential excitation current. In this way, when the second radiation branch 520 fails or is affected and cannot work normally, the first radiation branch 510 can transmit part of the differential excitation current through the third ground terminal 543 of the first matching circuit 540 to form a return path for the differential excitation current and provide NFC function.

[0040] The second matching circuit 550 has a third connection terminal 551, a fourth connection terminal 552 and a fourth ground terminal 553. The third connection terminal 551 is electrically connected to the second feeding point, the fourth connection terminal 552 is electrically connected to the second differential signal terminal 532, and the fourth ground terminal 553 is grounded. The second matching circuit 550 is used to match the impedance of the second radiation branch 520 when transmitting the differential excitation current. In some implementations, the second matching circuit 550 can transmit part of the differential excitation current through the fourth ground terminal 553 to provide a return path for part of the differential excitation current. In this way, when the first radiation branch 510 fails or is affected and cannot work normally, the second radiation branch 520 can transmit part of the differential excitation current through the fourth ground terminal 553 of the second matching circuit 550 to form a return path for the differential excitation current and provide an NFC function. That is, the first matching circuit 540 and the second matching circuit 550 can provide at least two return paths for the differential excitation current.

[0041] Usually, the resonance frequency corresponding to the first radiation branch 510 and the resonance frequency corresponding to the second radiation branch 520 should be the same and be the target operating frequency. The target operating frequency is the center frequency of the target operating frequency band, and the target operating frequency may be 13.56 MHz for near field communication.

[0042] The first matching circuit 540 may be a combination circuit composed of at least one capacitor or other components. In some implementations, the first matching circuit 540 may include a first capacitor and a second capacitor, the two ends of the first capacitor are respectively connected to the first connection terminal 541 and the second connection terminal 542, and the two ends of the second capacitor are respectively connected to the first connection terminal 541 and the third ground terminal 543. The second matching circuit 550 includes a third capacitor and a fourth capacitor, the two ends of the third capacitor are respectively connected to the third connection terminal 551 and the fourth connection terminal 552, and the two ends of the fourth capacitor are respectively connected to the third connection terminal 551 and the fourth ground terminal 553. In some implementations, the second capacitor provides a return path for a part of the differential excitation current through the third ground terminal 543, and / or the fourth capacitor provides a return path for a part of the differential excitation current through the fourth ground terminal 553. It should be understood that the second capacitor may be a single component or a component composed of multiple capacitors in parallel; the fourth capacitor may be a single component or a component composed of multiple capacitors in parallel. For example, when the first radiation branch 510 fails or is affected and cannot work normally, the second radiation branch 520 can transmit part of the differential excitation current through the fourth ground terminal 553 to form a return path for the differential excitation current and provide NFC function.

[0043] In some implementations, the elements of the first matching circuit 540 and the second matching circuit 550 may be symmetrically arranged. In other implementations, the elements of the first matching circuit 540 and the second matching circuit 550 may be asymmetrically arranged. That is, the value of the first capacitor and the value of the third capacitor may be the same or different, and the value of the second capacitor and the value of the fourth capacitor may be the same or different.

[0044] The electronic device 500 may further include a first filter circuit and a second filter circuit. The first filter circuit is located between the near field communication chip 530 and the first matching circuit 540, and is used to filter out interference signals of the differential excitation current on the first radiation branch 510. The second filter circuit is located between the near field communication chip 530 and the second matching circuit 550, and is used to filter out interference signals of the differential excitation current on the second radiation branch 520.

[0045] The first filter circuit may be a circuit composed of components such as capacitors and / or inductors. In some implementations, the first filter circuit may include a first inductor and a fifth capacitor. The two ends of the first inductor are respectively connected to the first differential signal terminal 531 and the second connection terminal 542 of the first matching circuit 540, one end of the fifth capacitor is connected to the second connection terminal 542, and the other end of the fifth capacitor is grounded. And / or, the second filter circuit includes a second inductor and a sixth capacitor, the two ends of the second inductor are respectively connected to the second differential signal terminal 532 and the fourth connection terminal 552 of the second matching circuit 550, one end of the sixth capacitor is connected to the fourth connection terminal 552, and the other end of the sixth capacitor is grounded.

[0046] In some implementations, the electronic device 500 may further include a non-near field communication chip. The non-near field communication chip is used to provide a non-near field communication excitation current, and the non-near field communication chip is electrically connected to the third feeding point, and the third feeding point is located on the first radiation branch 510. And / or, the non-near field communication chip is electrically connected to the fourth feeding point, and the fourth feeding point is located on the second radiation branch 520. That is, the first radiation branch 510 can be reused for non-near field communication, and / or, the second radiation branch 520 can be reused for non-near field communication.

[0047] The non-near field communication chip may be, for example, a cellular communication chip, a wireless fidelity (WiFi) chip, a global positioning system (GPS) chip, or a Bluetooth (BT) chip, for implementing corresponding communication functions.

[0048] It can be known from the principle of quarter-wavelength resonance that when transmitting wireless signals, the lower the frequency of the wireless signal, the longer the effective radiation length required by the antenna; and the higher the frequency of the wireless signal, the shorter the effective radiation length required by the antenna. Therefore, the distance between the third feeding point and the first grounding point can be smaller than the distance between the first feeding point and the first grounding point, which helps to increase the effective radiation length of the first radiation branch 510, thereby improving the performance of the NFC antenna. The distance between the fourth feeding point and the second grounding point can be smaller than the distance between the second feeding point and the second grounding point, which helps to increase the effective radiation length of the second radiation branch 520.

[0049] In some implementations, the electrical length of the first radiation branch 510 and / or the second radiation branch 520 may be determined according to 1 / 4 wavelength of its target operating frequency band.

[0050] In some implementations, the electronic device 500 may be a foldable electronic device.

[0051] In some implementations, when the foldable electronic device is in the unfolded state, the first radiating branch 510 operates at the target operating frequency, and the second radiating branch 520 operates at the target operating frequency; when the electronic device is in the folded state, the first radiating branch 510 may be affected by the surrounding environment and cannot work normally, and is in a non-working state, while the second radiating branch 520 works normally at the target operating frequency. For example, the first radiating branch 510 uses FPC wiring as a branch. If the screen is folded outward, the first radiating branch 510 is sandwiched in the middle and cannot work normally due to the surrounding environment. Alternatively, when the electronic device is in the folded state, the first radiating branch 510 operates at the target operating frequency, and the second radiating branch 520 operates at the target operating frequency; when the electronic device is in the unfolded state, the first radiating branch 510 is affected by the surrounding environment and cannot work normally, and is in a non-working state, while the second radiating branch 520 works normally at the target operating frequency. For example, the first radiation branch 510 is located on the middle frame at the rotating shaft. When the electronic device is in the unfolded state, the first radiation branch 510 cannot be in a normal working state due to the influence of the surrounding metal environment.

[0052] Although the working state of the first radiation branch 510 is affected in different states, the second radiation branch 520 is not affected, and the electronic device 500 can still provide the NFC antenna function. It should be understood that the first radiation branch 510 can be any one of two or more radiation branches, and the second radiation branch 520 can be a radiation branch different from the first radiation branch 510.

[0053] In some implementations, when the foldable electronic device is in an unfolded (folded) state, the first radiating branch 510 operates at a target operating frequency, and the second radiating branch 520 cannot operate normally; and when the electronic device is in a folded (unfolded) state, the first radiating branch 510 may be affected by the surrounding environment and cannot operate normally, and is in a non-working state, while the second radiating branch 520 operates normally at the target operating frequency.

[0054] In the embodiment of the present application, the first matching circuit and the second matching circuit are isolated by the grounding point so that the two radiating branches do not interfere with each other, and the two radiating branches can be adjusted separately to meet the requirements of the NFC antenna. Since the matching circuits of the two radiating branches are isolated, the return paths of the differential excitation current can be formed separately. Even if one radiating branch fails, the other radiating branch is not affected, and the normal operation of the NFC antenna can be ensured. The embodiment of the present application helps to avoid the failure of the NFC function of the whole machine due to the failure of a radiating branch, and helps to improve the communication experience of the user.

[0055] The foldable electronic device according to the embodiment of the present application is further described below in combination with some possible implementation methods of the embodiment of the present application.

[0056] Figure 6 yes Figure 5 A structural diagram of a possible implementation of an electronic device. Figure 6 As shown, the electronic device 600 may include: a first radiation branch 510, a second radiation branch 520, a near field communication chip 530, a first matching circuit 540 and a second matching circuit 550. The first radiation branch 510 and the second radiation branch 520 are located in the schematic box on the right side of the figure, which are not shown.

[0057] The first radiating branch 510 has a first grounding point and a first feeding point, and the first grounding point is grounded. The first radiating branch 510 is used to transmit and receive radio frequency signals of a target operating frequency band. The target operating frequency band can be a 13.56MHz band of a near field communication band or other near field communication bands. The second radiating branch 520 has a second grounding point and a second feeding point, and the second grounding point is grounded. The second radiating branch 520 is used to transmit and receive radio frequency signals of a target operating frequency band.

[0058] The near field communication chip 530 has a first differential signal terminal 531 and a second differential signal terminal 532, and the first differential signal terminal and the second differential signal terminal are used to provide a differential excitation current. For example, the first differential signal terminal 531 can be a positive (+) port, and the second differential signal terminal 532 can be a negative (-) port. For example, the differential excitation current provided by the near field communication chip 530 can be output via the first differential signal terminal 531, and flow back to the near field communication chip 530 via the second differential signal terminal 532, thereby forming a current loop.

[0059] The first matching circuit 540 is used to match the impedance when the first radiation branch 510 transmits a differential excitation current. The first matching circuit 540 may include a first capacitor C1 and a second capacitor C2, wherein both ends of the first capacitor C1 are respectively connected to the first connection terminal 541 and the second connection terminal 542, and both ends of the second capacitor C2 are respectively connected to the first connection terminal 541 and the third ground terminal 543. The second matching circuit 550 is used to match the impedance when the second radiation branch 520 transmits a differential excitation current. The second matching circuit 550 may include a third capacitor C3 and a fourth capacitor C4, wherein both ends of the third capacitor C3 are respectively connected to the third connection terminal 551 and the fourth connection terminal 552, and both ends of the fourth capacitor C4 are respectively connected to the third connection terminal 551 and the fourth ground terminal 553.

[0060] In some implementations, the second capacitor C2 provides a return path for the partial differential excitation current through the third ground terminal 543, and / or the fourth capacitor C4 provides a return path for the partial differential excitation current through the fourth ground terminal 553. For example, when the first radiation branch 510 fails or is affected and cannot work normally, the second radiation branch 520 can transmit the partial differential excitation current through the fourth ground terminal 553 to form a return path for the partial differential excitation current. That is, the current can form a resonance via the common ground (the fourth ground terminal 553) → the fourth capacitor C4 → the second radiation branch 520 → the common ground, and the resonance can be called the second resonance. The second resonance corresponds to the second radiation branch 520. For another example, when the second radiation branch 520 fails or is affected and cannot work normally, the first radiation branch 510 can transmit the partial differential excitation current through the third ground terminal 543 to form a return path for the partial differential excitation current. That is, the current can form a first resonance via the common ground (the third ground terminal 543) → the second capacitor C2 → the first radiation branch 510 → the common ground. The first resonance corresponds to the first radiation branch 510. It is understandable that in near field communication, the first resonance frequency corresponding to the first radiation branch 510 and the second resonance frequency corresponding to the second radiation branch 520 should be the same and the target operating frequency. The target operating frequency can be 13.56 MHz for near field communication.

[0061] The elements of the first matching circuit 540 and the second matching circuit 550 do not have to be arranged symmetrically. The value of the first capacitor C3 and the value of the third capacitor C4 can be the same or different, and the value of the second capacitor C2 and the value of the fourth capacitor C4 can be the same or different.

[0062] The electronic device 500 may further include a first filter circuit 560 and a second filter circuit 570. The first filter circuit 560 is used to filter out the interference signal of the differential excitation current on the first radiation branch 510. The second filter circuit 570 is used to filter out the interference signal of the differential excitation current on the second radiation branch 520. The first filter circuit 560 may include a first inductor L1 and a fifth capacitor C5. The two ends of the first inductor L1 are respectively connected to the first differential signal terminal 531 and the second connection terminal 542 of the first matching circuit 540, one end of the fifth capacitor C5 is connected to the second connection terminal 542, and the other end of the fifth capacitor C5 is grounded. The second filter circuit 570 includes a second inductor L2 and a sixth capacitor C6, the two ends of the second inductor L2 are respectively connected to the second differential signal terminal 532 and the fourth connection terminal 552 of the second matching circuit 550, one end of the sixth capacitor C6 is connected to the fourth connection terminal 552, and the other end of the sixth capacitor C6 is grounded.

[0063] Figure 6 The NFC circuit with dual radiation branches has dual resonances, and the two resonances correspond to the two radiation branches respectively, and both matching circuits have return grounds, so the two resonant frequencies can be adjusted separately without interfering with each other. For example, the first capacitor C1 and / or the second capacitor C2 of the first matching circuit 540 can be adjusted separately to adjust the first resonant frequency, and the third capacitor C3 and / or the second capacitor C4 of the second matching circuit 550 can also be adjusted to adjust the second resonant frequency. In some embodiments, the first resonant frequency can also be adjusted by adjusting the first inductor L1 and / or the fifth capacitor C5 of the first filter circuit 560, and the second resonant frequency can be adjusted by adjusting the second inductor L2 and / or the sixth capacitor C6 of the second filter circuit 570.

[0064] In actual debugging, the resonant frequencies of the first radiation branch 510 and the second radiation branch 520 should be debugged to 13.56 MHz respectively. In order to illustrate the principle and specific debugging scheme, and to facilitate understanding and intuitively display the debugging effect, the two resonant frequencies can be debugged at different resonant frequencies during simulation. The following is an exemplary explanation with the resonant frequencies of the first radiation branch 510 and the second radiation branch 520 being 14.7 MHz and 16.3 MHz respectively.

[0065] Figure 7 yes Figure 6 A schematic diagram of adjusting the resonant frequency of the radiation branch. Figure 7As shown, the continuous solid line is the initial resonance curve, the first resonance frequency corresponding to the first radiation branch 510 is 14.7MHz, and the second resonance frequency corresponding to the second radiation branch 520 is 16.3MHz. The dotted line is the resonance curve when the first matching circuit 540 is adjusted alone, and the dashed line is the resonance curve when the second matching circuit 550 is adjusted alone. By adjusting the components of the first matching circuit 540 alone (for example, the first capacitor C1), the first resonance frequency corresponding to the first radiation branch 510 is adjusted from 14.7MHz to 13MHz, while the second resonance frequency corresponding to the second radiation branch 520 remains unchanged (as shown by the dashed line at point 2). When the components of the second matching circuit 550 are adjusted alone (for example, the fourth capacitor C4), the second resonance frequency corresponding to the second radiation branch 520 is changed from 16.3MHz to 14.9MHz, while the first resonance frequency of the first radiation branch 510 remains unchanged (as shown by the dashed line at point 1). It can be seen that the resonance frequencies (frequencies) of the two radiation branches can be adjusted separately without interfering with each other.

[0066] Figure 8 yes Figure 6 Schematic diagram of another resonant frequency adjustment of the radiation branch. Figure 8 It is also a resonance curve to simulate the break of a radiation branch. Figure 8 As shown, the continuous solid line is the initial resonance curve, the first resonance frequency corresponding to the first radiation branch 510 is 14.7MHz, and the second resonance frequency corresponding to the second radiation branch 520 is 16.3MHz. When the second radiation branch 520 of the antenna is broken, the second radiation branch 520 does not resonate, and the first resonance frequency corresponding to the first radiation branch 510 remains unchanged at 14.7MHz. At this time, the NFC function of the electronic device is not completely ineffective, and the first radiation branch 510 can work normally.

[0067] By utilizing the independent characteristics of the two radiating branches in the embodiment of the present application, in some implementations, the performance of the two radiating branches of the NFC antenna can be superimposed, thereby improving the antenna performance. In some implementations, the stability of the NFC antenna can also be improved by utilizing the non-interference of the two radiating branches.

[0068] In some implementations, the two radiating branches may be arranged at a relatively long distance to increase the functional area of ​​the NFC antenna and improve the user experience.

[0069] In the embodiment of the present application, the first matching circuit and the second matching circuit are isolated by the grounding point so that the two radiating branches do not interfere with each other, and the two radiating branches can be adjusted separately to meet the requirements of the NFC antenna. Since the matching circuits of the two radiating branches are isolated, the two radiating branches can respectively form a return path for the differential excitation current. Even if one branch fails, the other branch is not affected, and the normal operation of the NFC antenna can be guaranteed. The embodiment of the present application helps to avoid the failure of the NFC function of the entire machine due to the failure of a certain radiating branch, and helps to improve the user's communication experience. In addition, the matching circuit in the embodiment of the present application can share a printed circuit board (PCB) with a typical NFC antenna matching circuit for compatible design, which helps to reduce the design risk of a single solution.

[0070] Fig. 9 yes Figure 5 A schematic structural diagram of another possible implementation of an electronic device. Fig. 9 The electronic device 900 is a foldable electronic device, and the folding type of the electronic device is not limited, for example, it can be horizontal folding, vertical folding, or other types of folding in the future. Fig. 9 As shown, the electronic device 900 may include a first radiation branch 510 and a second radiation branch 520 .

[0071] The first radiating branch 510 is located on the middle frame at the hinge of the electronic device 900, and the second radiating branch 520 is located on the top side of the electronic device 900. When the electronic device is in the unfolded state, the first radiating branch 510 is affected by the surrounding environment and cannot be in a normal working state, and the NFC performance corresponding to the first radiating branch 510 is almost invalid, and the second radiating branch 520 can work normally at the target working frequency (13.56MHz); when the electronic device is in the folded state, the first radiating branch 510 can work normally and work at the target working frequency, and the second radiating branch 520 can also work normally. Thus, the two radiating branches can superimpose the performance of the NFC antenna, which helps to improve the performance and stability of the NFC antenna, so that the electronic device has stable NFC performance in different states (unfolded or folded).

[0072] Fig.10 yes Figure 5 A schematic structural diagram of yet another possible implementation of an electronic device. Fig.10 The electronic device 1000 is a foldable electronic device, taking a vertically foldable mobile phone as an example. Fig.10As shown, the electronic device 1000 may include a first radiating branch 510 and a second radiating branch 520. The first radiating branch 510 is located on the back of the upper half screen of the electronic device 1000, and the second radiating branch 520 is located on the middle frame at the hinge. For example, the first radiating branch 510 can be made using FPC wiring. When the foldable electronic device is in an unfolded state, the first radiating branch 510 can work normally and work at the target working frequency, while the second radiating branch 520 cannot work normally. If the screen of the electronic device is folded outward, the first radiating branch 510 is sandwiched in the middle and cannot be in a normal working state due to the surrounding environment, while the second radiating branch 520 can work normally. Thereby, the electronic device can have stable NFC performance in different states (unfolded or folded), which also helps to improve the performance and stability of the NFC antenna.

[0073] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present disclosure is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a machine-readable storage medium, or transmitted from one machine-readable storage medium to another machine-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The machine-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0074] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments of the present disclosure can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present disclosure.

[0075] It should be understood that in the various embodiments of the present application, "first", "second", etc. are used to distinguish different objects rather than to describe a specific order. The size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0076] In the several embodiments provided in the present disclosure, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0077] In several embodiments provided in the present application, it should be understood that when a certain part is said to be "connected" or "connected" to another part, it means that the part can not only be "directly connected" but also "electrically connected" with another element intervening therebetween. In addition, the term "connected" also means that the part is "physically connected" and "wirelessly connected". In addition, when a certain part is said to "include" a certain element, unless otherwise stated, it means that the certain part can include another element, rather than excluding the other element.

[0078] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0079] In addition, each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0080] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. An electronic device, characterized in that: include: The first radiation branch has a first grounding point and a first feeding point, wherein the first grounding point is grounded; The second radiation branch has a second grounding point and a second feeding point, and the second grounding point is grounded; A near field communication chip, comprising a first differential signal terminal and a second differential signal terminal, wherein the first differential signal terminal and the second differential signal terminal are used to provide a differential excitation current; A first matching circuit, comprising a first connection end, a second connection end and a third grounding end, wherein the first connection end is electrically connected to the first feeding point, the second connection end is electrically connected to the first differential signal end, the third grounding end is grounded, and the first matching circuit is used to match the impedance of the first radiation branch when transmitting the differential excitation current; The second matching circuit has a third connection end, a fourth connection end and a fourth grounding end, the third connection end is electrically connected to the second feeding point, the fourth connection end is electrically connected to the second differential signal end, the fourth grounding end is grounded, and the second matching circuit is used to match the impedance of the second radiation branch when transmitting the differential excitation current.

2. The electronic device according to claim 1, characterized in that: The resonant frequency point corresponding to the first radiation branch node is the same as the resonant frequency point corresponding to the second radiation branch node, and is the target operating frequency point.

3. The electronic device according to claim 2, characterized in that: The first matching circuit includes a first capacitor and a second capacitor, two ends of the first capacitor are connected to the first connection end and the second connection end respectively, and two ends of the second capacitor are connected to the first connection end and the third ground end respectively; The second matching circuit includes a third capacitor and a fourth capacitor, wherein two ends of the third capacitor are respectively connected to the third connection end and the fourth connection end, and two ends of the fourth capacitor are respectively connected to the third connection end and the fourth ground end.

4. The electronic device according to claim 3, characterized in that: The second capacitor provides a return path for part of the differential excitation current through the third ground terminal, and / or, The fourth capacitor provides a return path for part of the differential excitation current through the fourth ground terminal.

5. The electronic device according to claim 3, characterized in that: The value of the first capacitor is different from the value of the third capacitor, and / or the value of the second capacitor is different from the value of the fourth capacitor.

6. The electronic device according to claim 2, characterized in that: Also includes: a first filtering circuit, located between the near field communication chip and the first matching circuit, and configured to filter out interference signals of the differential excitation current on the first radiation branch; The second filtering circuit is located between the near field communication chip and the second matching circuit, and is used to filter out interference signals of the differential excitation current on the second radiation branch.

7. The electronic device according to claim 6, characterized in that: The first filtering circuit includes a first inductor and a fifth capacitor, two ends of the first inductor are respectively connected to the first differential signal end and the second connection end of the first matching circuit, one end of the fifth capacitor is connected to the second connection end, and the other end of the fifth capacitor is grounded; and / or, The second filtering circuit includes a second inductor and a sixth capacitor, two ends of the second inductor are respectively connected to the second differential signal end and the fourth connection end of the second matching circuit, one end of the sixth capacitor is connected to the fourth connection end, and the other end of the sixth capacitor is grounded.

8. The electronic device according to any one of claims 1 to 7, characterized in that: The electronic device further comprises: A non-near field communication chip is used to provide a non-near field communication excitation current, the non-near field communication chip is electrically connected to a third feeding point, the third feeding point is located on the first radiation branch, and / or the non-near field communication chip is electrically connected to a fourth feeding point, and the fourth feeding point is located on the second radiation branch.

9. The electronic device according to any one of claims 1 to 7, characterized in that: The electronic device is a foldable electronic device.

10. The electronic device according to claim 9, characterized in that: When the electronic device is in an unfolded state, the first radiation branch operates at the target operating frequency point, and when the electronic device is in a folded state, the first radiation branch is in a non-operating state; or, When the electronic device is in a folded state, the first radiation branch operates at the target operating frequency point, and when the electronic device is in an unfolded state, the first radiation branch is in a non-operating state.

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