Near field communication system and electronic equipment

Abstract

The invention relates to the technical field of near-field communication, and discloses a near-field communication system and electronic equipment, and the near-field communication system comprises a near-field communication control chip, a first low-pass filter, a first impedance matching circuit, a second impedance matching circuit, a first antenna and a second antenna. The first antenna is a near-field communication antenna, and the second antenna is any one of the near-field communication antenna or a high-frequency communication antenna; the first impedance matching circuit is connected between the two output ends of the first low-pass filter and the first antenna, and the second impedance matching circuit is connected between one output end of the first low-pass filter and the second antenna; when the second antenna is a near field communication antenna, the second impedance matching circuit is connected with the second antenna; when the second antenna is a high-frequency communication antenna, an isolation circuit is arranged between the second impedance matching circuit and the second antenna. The electronic equipment comprises the near field communication system. The communication range of the electronic equipment can be expanded, and the user experience is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of near field communication, and in particular to a near field communication system and an electronic device. Background Art

[0002] At present, Near Field Communication (NFC) technology is a short-range wireless communication technology that allows contactless point-to-point data transmission and exchange between electronic devices. Its application in mobile terminals has become increasingly common. The NFC function is mainly implemented by the NFC controller chip. The NFC controller (NFC Controller, NFCC) implements the functions of the RF front end, and also implements the functions of contactless technology detection, protocol activation, NFCEE management, routing management, NFC Controller Interface (NFC Controller Interface, NCI), etc. The RF front end is mainly responsible for establishing a near field communication link based on a 13.56MHz carrier with the remote endpoint. At present, NFC has three working modes: card emulation mode (card mode), peer-to-peer mode (P2P mode), and reader / writer mode (card machine mode).

[0003] As the user base grows, users' experience with the NFC system increases, and electronic devices need to be more compatible with the communication in card mode and card machine mode. The communication performance in card machine mode requires the device to emit a sufficiently large field strength, which means that a sufficiently good antenna environment is required. However, with the increasing functions of electronic devices such as mobile phones, a large part of the area on the device needs to be occupied by other modules. For example, the space occupied by the camera module continues to increase, and the layout environment of the NFC antenna is becoming increasingly harsh. In order to ensure that electronic devices can have good communication performance in card machine mode, the existing technology generally sets the NFC antenna position downward to expand the communication range of the NFC antenna. However, after the NFC antenna is moved downward, the user's card swiping is limited to a certain posture, which is not conducive to the user's card swiping habits and the user experience is not good; however, if part of the performance is sacrificed to expand the communication range of the NFC antenna, the user experience of other modules will be reduced.

[0004] Therefore, how to increase the communication range of electronic devices and improve user experience is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In order to solve the above technical problems, the present disclosure provides a near field communication system and an electronic device to solve the problem that the electronic devices in the prior art cannot take into account both improving the near field communication effect and enhancing the user experience.

[0006] The present disclosure provides a near field communication system, comprising at least a near field communication control chip, a first low-pass filter, a first impedance matching circuit, a second impedance matching circuit, a first antenna and a second antenna; wherein the first antenna is a near field communication antenna, and the second antenna is any one of a near field communication antenna and a high frequency communication antenna; The near field communication control chip includes a first transmitting end and a second transmitting end, and the first transmitting end and the second transmitting end are respectively connected to two input ends of the first low-pass filter; The first impedance matching circuit is connected between two output ends of the first low-pass filter and the first antenna, and the second impedance matching circuit is connected between one output end of the first low-pass filter and the second antenna; When the second antenna is a near field communication antenna, the second impedance matching circuit is connected to the second antenna; When the second antenna is a high-frequency communication antenna, an isolation circuit is further included between the second impedance matching circuit and the second antenna.

[0007] Optionally, the second antenna is a high frequency communication antenna; The isolation circuit includes a second low-pass filter and a high-pass filter. The input end of the second low-pass filter is connected to the output end of the second impedance matching circuit. The output end of the high-pass filter and the output end of the second low-pass filter are both connected to the second antenna.

[0008] Further optionally, the first impedance matching circuit includes two first capacitors and two second capacitors, one end of the two first capacitors is respectively connected to the two output ends of the first low-pass filter, the other ends of the two first capacitors are respectively connected to one end of the two second capacitors, and the other ends of the two second capacitors are both grounded; The second impedance matching circuit includes a third capacitor and a fourth capacitor, one end of the third capacitor is connected to an output end of the first low-pass filter, the other end of the third capacitor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is grounded; One end of the isolation circuit is connected between the third capacitor and the fourth capacitor, and the other end of the isolation circuit is connected to the second antenna.

[0009] Optionally, the equivalent impedance formed by the first impedance matching circuit and the first antenna is a first equivalent impedance, and the equivalent impedance formed by the second impedance matching circuit and the second antenna is a second equivalent impedance; wherein the first equivalent impedance is greater than the second equivalent impedance.

[0010] Optionally, the first low-pass filter includes two fifth capacitors and two first inductors; One ends of the two first inductors are connected to the first transmitting end and the second transmitting end respectively, the other ends of the two first inductors are connected to one ends of the two fifth capacitors respectively, and the other ends of the two fifth capacitors are both grounded.

[0011] Optionally, the near field communication control chip further includes a first receiving end and a second receiving end; The first receiving end and the second receiving end are connected to the first antenna through a peripheral receiving circuit; The first receiving end and the second receiving end are connected to the second antenna through the peripheral receiving circuit; The first receiving end, the second receiving end and the peripheral receiving circuit form a receiving circuit.

[0012] Further optionally, the peripheral receiving circuit includes two groups of sixth capacitors and first resistors connected in series, the first receiving end is connected to an output end of the first low-pass filter through one group of sixth capacitors and first resistors connected in series, and the second receiving end is connected to another output end of the first low-pass filter through another group of sixth capacitors and first resistors connected in series.

[0013] Based on the same inventive concept, the present disclosure also provides an electronic device, which includes the above-mentioned near field communication system.

[0014] Optionally, the second antenna is a high frequency communication antenna; The electronic device comprises a main body area and a frame area at least partially surrounding the main body area; The second antenna is located in the border area, and the first antenna is located in the main body area.

[0015] Further optionally, the electronic device further includes a high-frequency communication control chip and a high-frequency impedance matching circuit, and the high-frequency communication control chip is connected to the second antenna via the high-frequency impedance matching circuit; The isolation circuit includes a second low-pass filter and a high-pass filter, the input end of the second low-pass filter is connected to the output end of the second impedance matching circuit, and the input end of the high-pass filter is connected to the output end of the high-frequency impedance matching circuit. The output end of the high pass filter and the output end of the second low pass filter are both connected to the second antenna.

[0016] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages: In the near field communication system disclosed in the present invention, the near field communication control chip is connected to the first antenna through the first impedance matching circuit, and is also connected to the second antenna through the second impedance matching circuit. When the second antenna is a near field communication antenna, it can work together with the first antenna, which is also a near field communication antenna, to expand the communication range and improve the communication effect; and at this time, the second impedance matching circuit and the second antenna can be directly connected, and there is no need to set an isolation circuit, which can save the layout space of the isolation circuit in the device, which is conducive to increasing the layout space of other antenna structures and saving costs. When the second antenna is a high-frequency communication antenna, the high-frequency communication antenna included in the electronic device using the near field communication system disclosed in the present invention can be reused, and it can work together with the original first antenna. Even if it is used in the card machine mode, the magnetic field excited by the first antenna and the magnetic field excited by the second antenna of the reused high-frequency communication antenna can be superimposed, and the output power of the near field communication control chip will not be dispersed, which can greatly improve the communication range; and when the second antenna is a high-frequency communication antenna, the second impedance matching circuit and the second antenna also include an isolation circuit, and the isolation circuit plays a role in isolating the interference between high frequency and low frequency. When the near-field communication system is applied to electronic devices, if the second antenna is a high-frequency communication antenna and the first antenna is a near-field communication antenna, the second antenna does not need to be set up separately. It only needs to reuse the original high-frequency communication antenna in the electronic device for near-field communication, which can effectively improve the communication range. Not only will it not affect the user's card swiping experience, it can also make the user's card swiping posture more diverse, and better improve user satisfaction. In addition, the second antenna reuses the original high-frequency communication antenna of the device for near-field communication, and will not take up additional space in the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 is a structural block diagram of a near field communication system provided by an embodiment of the present disclosure; Figure 2 is another structural block diagram of a near field communication system provided by an embodiment of the present disclosure; Figure 3 Is adopted Figure 2 A schematic diagram of a structure of an electronic device of a near field communication system is provided; Figure 4 Is adopted Figure 2Another structural schematic diagram of an electronic device of a near field communication system is provided; Figure 5 Is adopted Figure 2 Another structural schematic diagram of an electronic device of a near field communication system is provided; Figure 6 yes Figure 2 An equivalent circuit diagram of a near field communication system after a first antenna and a second antenna resonate is provided; Figure 7 is another structural block diagram of a near field communication system provided by an embodiment of the present disclosure; Figure 8 is another structural block diagram of a near field communication system provided by an embodiment of the present disclosure; Fig. 9 yes Figure 8 A schematic diagram of a circuit model structure; Fig.10 yes Figure 8 Another schematic diagram of the circuit model structure; Fig.11 yes Figure 8 Another schematic diagram of the circuit model structure; Fig.12 is a structural schematic diagram of an electronic device provided by an embodiment of the present disclosure; Fig.13 yes Fig.12 A structural block diagram of an electronic device. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0022] Please refer to Figure 1 and Figure 2 , Figure 1 is a structural block diagram of a near field communication system provided by an embodiment of the present disclosure, Figure 2It is another structural block diagram of the near field communication system provided by the embodiment of the present disclosure. The near field communication system 000 provided by the present embodiment at least includes a near field communication control chip 10, a first low-pass filter 20, a first impedance matching circuit 301, a second impedance matching circuit 302, a first antenna 401 and a second antenna 402; wherein the first antenna 401 is a near field communication antenna, and the second antenna 402 is any one of a near field communication antenna or a high frequency communication antenna; The near field communication control chip 10 includes a first transmitting terminal TX1 and a second transmitting terminal TX2, and the first transmitting terminal TX1 and the second transmitting terminal TX2 are respectively connected to two input terminals of the first low-pass filter 20; The first impedance matching circuit 301 is connected between two output ends of the first low-pass filter 20 and the first antenna 401 , and the second impedance matching circuit 302 is connected between one output end of the first low-pass filter 20 and the second antenna 402 ; When the second antenna 402 is a near field communication antenna, the second impedance matching circuit 302 is connected to the second antenna 402; When the second antenna 402 is a high-frequency communication antenna, an isolation circuit 50 is further included between the second impedance matching circuit 302 and the second antenna 402 .

[0023] Specifically, the near field communication system 000 provided in this embodiment can be used in terminal electronic devices with near field communication functions. The near field communication system 000 includes a near field communication control chip 10 and a first low-pass filter 20, and the near field communication control chip 10 can be an NFC control chip. The near field communication control chip 10 includes a first transmitting terminal TX1 and a second transmitting terminal TX2, and the first transmitting terminal TX1 and the second transmitting terminal TX2 are respectively connected to the two input terminals of the first low-pass filter 20. The first low-pass filter 20 is used for low-frequency signal shaping, filtering electromagnetic interference, and realizing the output of the signal sent and output by the first transmitting terminal TX1 and the second transmitting terminal TX2 after filtering. The output frequency is a sine wave waveform of 13.56MHz. Since the near field communication works at a frequency of 13.56MHz, the first low-pass filter 20 can realize the working frequency of the near field communication system 000 at 13.56MHz, and the inductive coupling and data transmission realize wireless identification and communication.

[0024] The near field communication system 000 of the present embodiment further includes a first impedance matching circuit 301, a second impedance matching circuit 302, a first antenna 401 and a second antenna 402. The first antenna 401 is a near field communication antenna. Optionally, the first antenna 401 may be a near field communication antenna included in an electronic device that adopts the near field communication system 000 of the present embodiment. The second antenna 402 is a near field communication antenna or a high frequency communication antenna. Optionally, when the second antenna 402 is a near field communication antenna, the second antenna 402 may be a near field communication antenna additionally provided in the electronic device that adopts the near field communication system 000 of the present embodiment. Alternatively, when the second antenna 402 is a high frequency communication antenna, the second antenna 402 may reuse a high frequency communication antenna included in the electronic device that adopts the near field communication system 000 of the present embodiment. For example, any one of a cellular antenna, a global positioning system antenna, a wireless system antenna, and a Bluetooth system antenna included in a general electronic communication device itself may be reused as the second antenna 402 to achieve enhanced near field communication function.

[0025] The near-field communication control chip 10 of this embodiment is connected to the first antenna 401 through the first impedance matching circuit 301, and is also connected to the second antenna 402 through the second impedance matching circuit 302. If the second antenna 402 is a near-field communication antenna, it can work together with the first antenna 401, which is also a near-field communication antenna, to expand the communication range. When the first antenna 401 and the second antenna 402 are near-field communication antennas, since both are good metal conductors, they can radiate magnetic fields to the outside, thereby expanding the communication range and improving the communication effect. When the second antenna 402 is a near-field communication antenna, the second impedance matching circuit 302 and the second antenna 402 can be directly connected, that is, there is no need to set up an isolation circuit, which can save the layout space of the isolation circuit in the device, which is conducive to increasing the layout space of other antenna structures, saving costs while improving communication effects.

[0026] The near field communication control chip 10 of this embodiment is connected to the first antenna 401 through the first impedance matching circuit 301, and is also connected to the second antenna 402 through the second impedance matching circuit 302. If the second antenna 402 is a high-frequency communication antenna, the high-frequency communication antenna included in the electronic device using the near field communication system 000 of this embodiment can be reused, and it can work together with the first antenna 401 included in it to expand the near field communication range. Even when used in the card machine mode, the magnetic field excited by the first antenna 401 and the magnetic field excited by the second antenna 402 that reuses the high-frequency communication antenna can be superimposed, and the output power of the near field communication control chip 10 will not be dispersed, which can greatly increase the communication range and enhance the user experience. When the second antenna 402 is a high-frequency communication antenna, an isolation circuit 50 is further included between the second impedance matching circuit 302 and the second antenna 402. Since the operating frequencies of high-frequency communication antennas such as cellular antennas, global positioning system antennas, wireless system antennas, Bluetooth system antennas, etc. are all in the order of hundreds of MHz and several GHz, and the operating frequency of near-field communication antennas is generally 13.56 MHz, if the second antenna 402 is a high-frequency communication antenna, an isolation circuit 50 can be set between the second impedance matching circuit 302 and the second antenna 402. The isolation circuit 50 plays a role in isolating interference between high frequency and low frequency.

[0027] In the near field communication system 000 of this embodiment, the first impedance matching circuit 301 and the second impedance matching circuit 302 are both used to adjust the transmission load and the resonant frequency. The near field communication control chip 10 simultaneously outputs a differential equal-amplitude square wave signal through the first transmitting terminal TX1 and the second transmitting terminal TX2, and then converts it into a differential equal-amplitude sine wave signal after passing through the first low-pass filter, and transmits it to the first antenna 401 after passing through the first impedance matching circuit 301, and the first antenna 401 generates an induced magnetic field to realize radio frequency signal transmission. Optionally, the near-field communication system 000 may further include a receiving circuit, and the radio frequency signal received by the first antenna 401 is transmitted to the receiving end of the near-field communication control chip 10 after passing through the first impedance matching circuit 301 and the receiving circuit, and is demodulated by the near-field communication control chip 10; similarly, the radio frequency signal emitted by the near-field communication control chip 10 through the first transmitting end TX1 and the second transmitting end TX2 is transmitted to the second antenna 402 after passing through the first low-pass filter and the second impedance matching circuit 302, and the second antenna 402 generates an induced magnetic field to realize radio frequency signal transmission. The radio frequency signal received by the second antenna 402 is transmitted to the receiving end of the near-field communication control chip 10 after passing through the second impedance matching circuit 302 and the receiving circuit, and is demodulated by the near-field communication control chip 10.

[0028] Optionally, in this embodiment, the first impedance matching circuit 301 and the second impedance matching circuit 302 can be appropriately adjusted so that more than 80% of the power of the RF signal output by the near field communication control chip 10 is allocated for main communication after passing through the first impedance matching circuit 301, and the remaining power is allocated for auxiliary communication after passing through the second impedance matching circuit 302.

[0029] When the near field communication system 000 of this embodiment is applied to an electronic device, if the second antenna 402 and the first antenna 401 are both near field communication antennas, that is, by setting up another near field communication antenna in the electronic device to work together with the original first antenna 401, the communication range can be effectively improved and the communication effect can be ensured. If the second antenna 402 is a high-frequency communication antenna and the first antenna 401 is a near field communication antenna, the second antenna 402 does not need to be set up separately, and only needs to reuse any one of the high-frequency communication antennas such as the original cellular antenna, global positioning system antenna, wireless system antenna, Bluetooth system antenna, etc. in the electronic device, so as to effectively improve the communication range and ensure the communication effect, which is conducive to the effective expansion of the near field communication range, and will not occupy additional space of the device.

[0030] In general electronic devices, high-frequency communication antennas are arranged at the frame of the device, and near-field communication antennas are arranged in the upper half or middle area of ​​the device. Therefore, in the prior art, in order to ensure that the electronic device has good communication performance, the near-field communication antenna is generally set to move downward to expand the communication range of the near-field communication antenna. However, after moving the near-field communication antenna downward, the user's card swiping is limited to a certain posture, which is not conducive to the user's card swiping usage habits and the user experience is not good. However, if part of the performance of the electronic device is sacrificed (such as reducing the space of the camera module and sacrificing the camera performance) to expand the communication range of the near-field communication antenna, the user experience of other modules will be reduced.

[0031] In this embodiment, a high-frequency communication antenna, i.e., a second antenna 402, included in the electronic device itself is connected to an output end of the first low-pass filter 20 through a second impedance matching circuit 302. By reusing the high-frequency communication antenna included in the electronic device itself as the second antenna 402, the location of the first antenna 401 can be diversified. Figure 3-Figure 5 As shown, Figure 3 Is adopted Figure 2 A schematic diagram of a structure of an electronic device of a near field communication system is provided, Figure 4 Is adopted Figure 2 Another structural schematic diagram of an electronic device of a near field communication system is provided, Figure 5 Is adopted Figure 2 Another structural diagram of an electronic device of a near field communication system is provided, in which the first antenna 401 can be arranged at a position overlapping with other modules 001 (such as a camera module generally included in the electronic device), such as Figure 3 or the first antenna 401 and the other modules 001 may be arranged separately in the upper half of the electronic device, such as Figure 4 As shown, at this time, even if the layout space of the first antenna 401 is reduced in order to ensure that the space of other modules 001 is large enough, the communication range will not be reduced due to the existence of the second antenna 402; or the setting position of the first antenna 401 can also be moved down to the lower half of the electronic device. Since the second antenna 402 of this embodiment reuses any one of the original cellular antenna, global positioning system antenna, wireless system antenna, and Bluetooth system antenna in the electronic device, that is, when the second antenna 402 reuses the high-frequency communication antenna included in the electronic device itself, the high-frequency communication antenna is generally set at the top frame of the electronic device, so even if the setting position of the first antenna 401 is moved down or the setting space is reduced, it will not affect the user's usage habits, and the user can ensure the near-field communication effect of the first antenna 401 or the second antenna 402 in any posture.

[0032] Therefore, the present embodiment Figure 2 The design scheme provided that the second antenna 402 reuses the high-frequency communication antenna included in the electronic device itself and the near-field communication control chip 10 to generate communication can greatly increase the communication range and improve the user experience by multiplexing other high-frequency communication antennas through the second antenna 402 without sacrificing the communication performance. Even after the first antenna 401 is moved down or the layout space is reduced, the second antenna 402 can be used to expand the card swiping area, ensure the communication performance in the card machine mode, improve the near-field communication success rate, meet the higher communication performance requirements of the terminal device, not only will it not affect the user's card swiping experience, but it can also make the user's card swiping posture more diverse, and better improve the user's satisfaction.

[0033] Optionally, in the near field communication system 000 of this embodiment, when the second antenna 402 is a high frequency communication antenna, and the high frequency communication antenna included in the multiplexing electronic device itself communicates with the near field communication control chip 10, the second antenna 402 can be used as a near field communication antenna only when the electronic device needs near field communication, and works together with the first antenna 401 to achieve the communication effect of the signal between the near field communication control chip 10. When the electronic device using the near field communication system 000 of this embodiment does not need to perform near field communication, the second antenna 402 can still be used as a high frequency communication antenna to realize its own high frequency communication function.

[0034] Optional, such as Figure 1 and Figure 2As shown, the second impedance matching circuit 302 of this embodiment is connected between an output end of the first low-pass filter 20 and the second antenna 402, and the other end of the second antenna 402 is grounded GND, that is, the second antenna 402 can be a separately provided near-field communication antenna, or it can be an original high-frequency communication antenna in a reused electronic device used for near-field communication, but the second antenna 402 can be set as a single-ended grounded antenna, connected to the first transmitting end TX1 of the near-field communication control chip 10, and the first antenna 401, as included in the near-field communication system 000 itself, can be a differential antenna structure, so that when the first antenna 401 and the second antenna 402 perform near-field communication together, the power allocated to the second antenna 402 is low, and the second antenna 402 and the second impedance matching circuit 302 can be more flexible in circuit design and have lower cost.

[0035] In some optional embodiments, please refer to Figure 2 and Figure 6 , Figure 6 yes Figure 2 The equivalent circuit diagram of the first antenna and the second antenna in the near field communication system after resonance is provided. In this embodiment, the equivalent impedance formed by the first impedance matching circuit 301 and the first antenna 401 of the near field communication system 000 is the first equivalent impedance Z L1 The equivalent impedance formed by the second impedance matching circuit 302 and the second antenna 402 is the second equivalent impedance Z L2 ; Among them, the first equivalent impedance Z L1 Greater than the second equivalent impedance Z L2 .

[0036] This embodiment explains that in the near field communication system 000, all the power output by the near field communication control chip 10 can be oscillated and dissipated on the equivalent impedance formed by the first impedance matching circuit 301 and the first antenna 401, and the equivalent impedance formed by the second impedance matching circuit 302 and the second antenna 402. In order to ensure that the communication performance of the first antenna 401 in the near field communication system 000 does not decrease or decreases to an acceptable range after the second antenna 402 of the high frequency communication antenna is multiplexed in the near field communication, the first equivalent impedance Z can be adjusted. L1 , the second equivalent impedance Z L2 Generally, the first equivalent impedance Z L1 Greater than the second equivalent impedance Z L2 , such as adjusting the first equivalent impedance Z L1 , the second equivalent impedance Z L2 The ratio is 3:1 or 4:1. Since the first antenna 401 is the original near-field communication antenna of the near-field communication system 000, the setting range is relatively large, and the original main near-field communication impedance, i.e., the first equivalent impedance Z L1It can be larger. Another second antenna 402 that reuses the high-frequency communication antenna plays an auxiliary role in near-field communication. Therefore, the second equivalent impedance Z L2 It can be smaller, so that the inevitable signal interference between each other can be as small as possible, and even if there is interference, it can be minimized. And when the near-field communication system is in the card machine mode, the magnetic field excited by the first antenna 401 of the near-field communication system 000 and the magnetic field excited by the second antenna 402 of the multiplexed high-frequency communication antenna can be superimposed, and all the power output by the near-field communication control chip 10 will not be dispersed; when the near-field communication system is in the card mode, the power required during the communication process is not large, so even if the power is distributed, it will not affect the communication effect.

[0037] In some alternative embodiments, please refer to Figure 7 , Figure 7 is another structural block diagram of the near field communication system provided by the embodiment of the present disclosure. In this embodiment, the near field communication system 000 may further include a third impedance matching circuit 303 and a third antenna 403. The third antenna 403 and the second antenna 402 are both high-frequency communication antennas, and the first antenna 401 is a near field communication antenna. The near field communication control chip 10 includes a first transmitting terminal TX1 and a second transmitting terminal TX2, and the first transmitting terminal TX1 and the second transmitting terminal TX2 are respectively connected to two input terminals of the first low-pass filter 20; The first impedance matching circuit 301 is connected between two output ends of the first low-pass filter 20 and the first antenna 401, the second impedance matching circuit 302 is connected between one output end of the first low-pass filter 20 and the second antenna 402, and the third impedance matching circuit 303 is connected between the other output end of the first low-pass filter 20 and the third antenna 403; A first isolation circuit 501 is further provided between the second impedance matching circuit 302 and the second antenna 402 , and a second isolation circuit 502 is further provided between the third impedance matching circuit 303 and the third antenna 403 .

[0038] This embodiment explains that when the second antenna 402 is a high-frequency communication antenna, the second antenna 402 can reuse the high-frequency communication antenna included in the electronic device that adopts the near-field communication system 000 of this embodiment, such as any one of the cellular antenna, global positioning system antenna, wireless system antenna, and Bluetooth system antenna included in the general electronic communication device itself can be reused as the second antenna 402 to achieve enhanced near-field communication functions. In addition, not only can one high-frequency communication antenna included in the electronic device itself be reused, but other high-frequency communication antennas can also be reused for near-field communication. Figure 7As shown, the near field communication system 000 may further include a third impedance matching circuit 303 and a third antenna 403, the second antenna 402 is one of the cellular antenna, global positioning system antenna, wireless system antenna, and Bluetooth system antenna included in the electronic communication device itself, the third antenna 403 is another of the cellular antenna, global positioning system antenna, wireless system antenna, and Bluetooth system antenna included in the electronic communication device itself, and the first antenna 401 is a near field communication antenna, which can enable three NFC antennas (the first antenna 401, the second antenna 402, and the third antenna 403) to work simultaneously, which is beneficial to further improve the communication range and improve the near field communication effect.

[0039] It can be understood that in this embodiment, the impedance distribution of the three NFC antennas can be configured with different powers according to the actual scenario during specific implementation. This embodiment does not make specific limitations on this. Generally, the first antenna 401 serves as the main communication antenna, the second antenna 402 serves as the secondary communication antenna, and the third antenna 403 serves as the supplementary communication antenna of the second antenna 402. For example, the third antenna 403 can only have the communication function of the card mode, which can help to improve the communication range in the card machine mode while ensuring the communication effect of the near field communication system 000 in different modes.

[0040] In some optional embodiments, please refer to Figure 2 and Figure 8 , Figure 8 This is another structural block diagram of the near field communication system provided by the embodiment of the present disclosure. In this embodiment, the second antenna 402 is a high-frequency communication antenna, that is, this embodiment uses the second antenna 402 multiplexing the high-frequency communication antenna included in the electronic device to perform near field communication as an example for explanation.

[0041] When the second antenna 402 is a high-frequency communication antenna, an isolation circuit 50 is included between the second impedance matching circuit 302 and the second antenna 402. The isolation circuit 50 includes a second low-pass filter 50L and a high-pass filter 50H. The input end of the second low-pass filter 50L is connected to the output end of the second impedance matching circuit 302, and the output end of the high-pass filter 50H and the output end of the second low-pass filter 50L are both connected to the second antenna 402.

[0042] Optionally, when the near field communication system of this embodiment is applied to an electronic device, the input end of the high-pass filter 50H can be connected to a high-frequency impedance matching circuit (not shown in the figure) in the electronic device. For details, please refer to the subsequent embodiments for understanding, and this embodiment will not be described in detail here.

[0043] This embodiment explains that the isolation circuit 50 includes a second low-pass filter 50L and a high-pass filter 50H, that is, the isolation circuit 50 may include a combiner composed of the second low-pass filter 50L and the high-pass filter 50H, the second low-pass filter 50L allows low-frequency signals to pass through and attenuates high-frequency signals, and the high-pass filter 50H allows high-frequency signals to pass through and attenuates low-frequency signals. The second low-pass filter 50L and the high-pass filter 50H are combined together to form a combiner, which can achieve the separation of low-frequency signals and high-frequency signals. When the electronic device needs near-field communication, the second antenna 402 is used as a near-field communication antenna, and works together with the first antenna 401 to achieve the communication effect of the signal between the near-field communication control chip 10. At this time, the isolation circuit 50 can prevent the high-frequency signal from affecting the transmission of the low-frequency signal during the near-field communication when the near-field communication system is working. When the electronic device does not need near-field communication, the second antenna 402 is still used as a high-frequency communication antenna. At this time, the isolation circuit 50 can prevent the low-frequency signal from affecting the transmission of the high-frequency signal during the high-frequency communication process of the electronic device.

[0044] In some optional embodiments, please refer to Figure 2 and Fig. 9 , Fig. 9 yes Figure 8 A schematic diagram of a circuit model structure is shown. In this embodiment, the second antenna 402 is a high-frequency communication antenna, that is, this embodiment uses the second antenna 402 multiplexing the high-frequency communication antenna included in the electronic device to perform near-field communication as an example for explanation. In this embodiment, the first low-pass filter 20 includes two fifth capacitors C0 and two first inductors L0; One ends of the two first inductors L0 are connected to the first transmitting end TX1 and the second transmitting end TX2 respectively, the other ends of the two first inductors L0 are connected to one ends of the two fifth capacitors C0 respectively, and the other ends of the two fifth capacitors C0 are both grounded GND1.

[0045] The first low-pass filter 20 is an EMC filter circuit formed by two fifth capacitors C0 and two first inductors L0. The first low-pass filter 20 is used to filter the signal output by the first transmitting end TX1 and the second transmitting end TX2 to obtain a filtered signal, which is, for example, a fundamental signal obtained after filtering and eliminating harmonic signals in the transmitting signal. The signal output by the first transmitting end TX1 and the second transmitting end TX2 of this embodiment can output a sinusoidal waveform with a frequency of 13.56 MHz after filtering by the first low-pass filter 20.

[0046] In this embodiment, the first impedance matching circuit 301 includes two first capacitors C11 and two second capacitors C21, one end of the two first capacitors C11 is respectively connected to the two output ends of the first low-pass filter 20, such as one end of the two first capacitors C11 is respectively connected between the fifth capacitor C0 and the first inductor L0 included in the first low-pass filter 20, the other end of the two first capacitors C11 is respectively connected to one end of the two second capacitors C21, and the other end of the two second capacitors C21 is grounded GND1; The second impedance matching circuit 302 includes a third capacitor C12 and a fourth capacitor C22, one end of the third capacitor C12 is connected to an output end of the first low-pass filter 20, such as one end of the third capacitor C12 is connected between a fifth capacitor C0 and a first inductor L0 included in the first low-pass filter 20, the other end of the third capacitor C12 is connected to one end of the fourth capacitor C22, and the other end of the fourth capacitor C22 is grounded to GND2 (it can be understood that the grounding end at this time can be a different grounding point from the grounding end connected to the first impedance matching circuit 301, so it is labeled GND2 here); One end of the isolation circuit 50 is connected between the third capacitor C12 and the fourth capacitor C22, and the other end of the isolation circuit 50 is connected to the second antenna 402. For example, one end of the second low-pass filter 50L included in the isolation circuit 50 is connected between the third capacitor C12 and the fourth capacitor C22, and the other end of the second low-pass filter 50L and the high-pass filter 50H are both connected to the second antenna 402.

[0047] This embodiment explains that the structure of the first impedance matching circuit 301 may include two first capacitors C11 and two second capacitors C21, one end of the two first capacitors C11 is respectively connected between the fifth capacitor C0 and the first inductor L0 included in the first low-pass filter 20, the other end of the two first capacitors C11 is respectively connected to one end of the two second capacitors C21, and the other end of the two second capacitors C21 is grounded GND1; the first impedance matching circuit 301 is used to receive the filtered signal output by the first low-pass filter 20 and output the first excitation signal to the first antenna 401, and the first excitation signal is used to drive the first antenna 401 to generate a magnetic field. One of the first capacitors C11 in the first impedance matching circuit 301 is mainly used to achieve impedance matching of one end of the first antenna 401 to the first transmitting end TX1 to achieve optimal transmission efficiency, and the other first capacitor C11 is mainly used to achieve impedance matching of the other end of the first antenna 401 to the second transmitting end TX2 to achieve optimal transmission efficiency; the two second capacitors C21 in the first impedance matching circuit 301 are mainly used to make the resonant frequency of the first antenna 401 at 13.56MHz.

[0048] The second impedance matching circuit 302 of this embodiment includes a third capacitor C12 and a fourth capacitor C22, one end of the third capacitor C12 is connected between a fifth capacitor C0 and a first inductor L0 included in the first low-pass filter 20, the other end of the third capacitor C12 is connected to one end of the fourth capacitor C22, and the other end of the fourth capacitor C22 is grounded GND2; the second impedance matching circuit 302 is used to receive the filtered signal output by the first low-pass filter 20 and output a second excitation signal to the second antenna 402, and the second excitation signal is used to drive the second antenna 402 to generate a magnetic field. The third capacitor C12 in the second impedance matching circuit 302 is mainly used to achieve impedance matching of one end of the second antenna 402 to the first transmitting end TX1 to achieve optimal transmission efficiency, and the fourth capacitor C22 is mainly used to make the resonant frequency of the second antenna 402 when used for near field communication be above 13.56MHz.

[0049] It can be understood that in the first impedance matching circuit 301 of the present embodiment, a first node N1 is included between a first capacitor C11 and a second capacitor C21, and a second node N2 is included between another first capacitor C11 and another second capacitor C21; one end of the first antenna 401 is connected to the first node N1, and the other end of the first antenna 401 is connected to the second node N2; in the second impedance matching circuit 302, a third node N3 is included between a third capacitor C12 and a fourth capacitor C22, one end of the isolation circuit 50 is connected to the third node N3, the other end of the isolation circuit 50 is connected to the second antenna 402, and the other end of the second antenna 402 is grounded to GND2, thereby realizing the connection between the first impedance matching circuit 301 and the first antenna 401, and realizing the connection between the second impedance matching circuit 302 and the second antenna 402. Since the first antenna 401 is a differential antenna and the second antenna 402 is a single-ended grounded antenna in the present embodiment, the circuit structure of the first impedance matching circuit 301 is different from the circuit structure of the second impedance matching circuit 302.

[0050] It is understandable that this embodiment does not limit the specific circuit structure of the second low-pass filter 50L and the high-pass filter 50H included in the isolation circuit 50. In specific implementation, it is only necessary to satisfy that the second low-pass filter 50L allows low-frequency signals to pass through and attenuates high-frequency signals, and the high-pass filter 50H allows high-frequency signals to pass through and attenuates low-frequency signals. The combiner formed by the second low-pass filter 50L and the high-pass filter 50H can separate low-frequency signals from high-frequency signals. Optionally, Fig.10 As shown, Fig.10 yes Figure 8 Another circuit model structure diagram, the second low-pass filter 50L can include a capacitor C LPF and inductor L LPF The high-pass filter 50H may include a capacitor CHPF and inductor L HPF The structure of this embodiment Fig.10 This is only an example. In a specific implementation, the structure of the isolation circuit 50 includes but is not limited to this. The structure of the isolation circuit 50 can be set according to actual needs.

[0051] In some optional embodiments, please refer to Figure 8 and Fig.11 , Fig.11 yes Figure 8 Another schematic diagram of a circuit model structure, in this embodiment, the near field communication control chip 10 further includes a first receiving end RX1 and a second receiving end RX2; The first receiving end RX1 and the second receiving end RX2 are connected to the first antenna 401 through the peripheral receiving circuit 60; The first receiving terminal RX1 is connected to the second antenna 402 via the peripheral receiving circuit 60; The first receiving terminal RX1 , the second receiving terminal RX2 , and the peripheral receiving circuit 60 form a receiving circuit.

[0052] Optionally, the peripheral receiving circuit 60 includes two groups of sixth capacitors Cr1 and first resistors Rr1 connected in series, the first receiving terminal RX1 is connected to an output terminal of the first low-pass filter 20 through one group of sixth capacitors Cr1 and first resistors Rr1 connected in series, and the second receiving terminal RX2 is connected to another output terminal of the first low-pass filter 20 through another group of sixth capacitors Cr1 and first resistors Rr1 connected in series, wherein the sixth capacitor Cr1 is used to filter out DC signals.

[0053] When the near field communication system 000 of this embodiment performs near field communication, the near field communication control chip 10 simultaneously outputs a differential equal-amplitude square wave signal through the first transmitting terminal TX1 and the second transmitting terminal TX2, which is then converted into a differential equal-amplitude sine wave signal after passing through the first low-pass filter 20, and then transmitted to the first antenna 401 through the first impedance matching circuit 301, and the first antenna 401 generates an induced magnetic field to realize radio frequency signal transmission. The near field communication system 000 may also include a receiving circuit composed of a first receiving terminal RX1, a second receiving terminal RX2, and two groups of sixth capacitors Cr1 and first resistors Rr1 connected in series on the near field communication control chip 10. The radio frequency signal received by the first antenna 401 is transmitted to the near field communication control chip 10 after passing through the receiving circuit formed by the first impedance matching circuit 301, the peripheral receiving circuit 60, the first receiving terminal RX1, and the second receiving terminal RX2, and is demodulated by the near field communication control chip 10; similarly, the radio frequency signal emitted by the near field communication control chip 10 through the first transmitting terminal TX1 is transmitted to the second antenna 402 after passing through the first low-pass filter 20 and the second impedance matching circuit 302, and the second antenna 402 generates an induced magnetic field to realize radio frequency signal transmission. The radio frequency signal received by the second antenna 402 is transmitted to the near field communication control chip 10 after passing through the receiving circuit formed by the second impedance matching circuit 302, the peripheral receiving circuit 60, and the first receiving terminal RX1, and is also demodulated by the near field communication control chip 10. Regardless of whether the radio frequency signal received by the antenna passes through the first antenna 401 or the second antenna 402 , the signal enters the near field communication control chip 10 from the same receiving circuit and is then demodulated, which is beneficial to saving costs.

[0054] In some optional embodiments, please refer to Figure 1-Figure 11 and Fig.12 , Fig.12 1 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure. This embodiment provides an electronic device 111, and the electronic device 111 may include the near field communication system 000 in any of the aforementioned embodiments. Fig.12The embodiment only takes the electronic device 111 as a mobile phone as an example to illustrate the electronic device 111. As an example but not a limitation, the electronic device 111 in this embodiment can be a portable or mobile computing device such as a terminal device, a mobile phone, a tablet computer, a laptop computer, a desktop computer, a gaming device, a vehicle-mounted electronic device or a wearable smart device, as well as other electronic devices such as an electronic database, a car, and a bank ATM. The wearable smart device includes a device with full functions, large size, and can achieve complete or partial functions without relying on a smart phone, such as a smart watch or smart glasses, and includes a device that only focuses on a certain type of application function and needs to be used in conjunction with other devices such as a smart phone, such as various types of smart bracelets and smart jewelry for vital sign monitoring. The electronic device 111 provided in the embodiment of the present disclosure has the beneficial effects of the near field communication system 000 provided in the embodiment of the present disclosure. For details, please refer to the specific description of the near field communication system 000 in the above embodiments, and this embodiment will not be repeated here.

[0055] In some optional embodiments, please continue to refer to Fig.12 , in this embodiment, the second antenna 402 is a high frequency communication antenna; The electronic device 111 includes a main body area 111A and a frame area 111B at least partially surrounding the main body area 111A; The second antenna 402 is located in the border area 111B, and the first antenna 401 is located in the main area 111A.

[0056] In the electronic device 111 of this embodiment, the near field communication system 000 includes a structure that connects the high frequency communication antenna, i.e., the second antenna 402, included in the electronic device 111 itself through the second impedance matching circuit 302 at one output end of the first low pass filter 20. By reusing the high frequency communication antenna included in the electronic device 111 itself as the second antenna 402, the setting position of the first antenna 401 can be diversified. The setting position of the first antenna 401 can be superimposed with other modules included in the electronic device 111 (such as a camera module generally included in the electronic device); or the setting position of the first antenna 401 and the setting position of the other modules can also be arranged separately in the upper half area of ​​the electronic device. At this time, even if the layout space of the first antenna 401 is reduced to ensure that the space for other modules is large enough, the near field communication range will not be reduced because of the reuse of the second antenna 402; or the setting position of the first antenna 401 can also be moved down to the lower half area of ​​the electronic device, that is, the setting position of the first antenna 401 can be located at any position of the main area 111A of the electronic device 111. The second antenna 402 reuses any one of the original cellular antenna, global positioning system antenna, wireless system antenna, and Bluetooth system antenna in the electronic device, that is, when the second antenna 402 reuses the high-frequency communication antenna included in the electronic device itself, the high-frequency communication antenna is generally arranged in the border area 111B of the electronic device, such as Fig.12 The top border area is shown in the figure, so even if the setting position of the first antenna 401 moves down in the main area 111A or the setting space is reduced, it will not affect the user's usage habits. The user can ensure the near-field communication effect of the first antenna 401 or the second antenna 402 in any posture.

[0057] In this embodiment, the second antenna 402 reuses the high-frequency communication antenna included in the electronic device 111 itself and the design scheme for generating communication between the near-field communication control chip 10. Without sacrificing communication performance, the second antenna 402 reuses other high-frequency communication antennas included in the electronic device 111 itself to greatly improve the communication range and enhance user experience. Even if the setting position of the first antenna 401 moves down in the main area 111A or the layout space is reduced, the second antenna 402 can be used to expand the card swiping area, ensure the communication performance in the card machine mode, improve the near-field communication success rate, meet the higher communication performance requirements of the terminal device, not only will it not affect the user's card swiping experience, but it can also make the user's card swiping posture more diverse, and better improve user satisfaction.

[0058] Optionally, in the electronic device 111 of this embodiment, when the second antenna 402 reuses the high-frequency communication antenna included in the electronic device 111 itself to generate communication with the near-field communication control chip 10, the second antenna 402 can be used as a near-field communication antenna only when the electronic device 111 needs near-field communication, and works together with the first antenna 401 to achieve a signal communication effect with the near-field communication control chip 10. When the electronic device 111 does not need to perform near-field communication, the second antenna 402 can still be used as a high-frequency communication antenna to achieve its own high-frequency communication function.

[0059] In some optional embodiments, please refer to Fig.12 and Fig.13 , Fig.13 yes Fig.12 A structural block diagram of an electronic device, in this embodiment, the electronic device 111 further includes a high-frequency communication control chip 70 and a high-frequency impedance matching circuit 80, and the high-frequency communication control chip 70 is connected to the second antenna 402 through the high-frequency impedance matching circuit 80; The isolation circuit 50 includes a second low-pass filter 50L and a high-pass filter 50H. The input end of the second low-pass filter 50L is connected to the output end of the second impedance matching circuit 302, and the input end of the high-pass filter 50H is connected to the output end of the high-frequency impedance matching circuit 80. The output end of the high pass filter 50H and the output end of the second low pass filter 50L are both connected to the second antenna 402 .

[0060] The electronic device 111 of this embodiment includes a near field communication system 000, and may also include a high frequency communication control chip 70 and a high frequency impedance matching circuit 80 for use with a high frequency communication antenna. The input end of the high pass filter 50H in the near field communication system 000 may be connected to the high frequency impedance matching circuit 80 in the electronic device 111, and the high frequency communication performance of the electronic device 111 is achieved through the control of the high frequency communication control chip 70.

[0061] The isolation circuit 50 in the near-field communication system 000 includes a second low-pass filter 50L and a high-pass filter 50H, that is, the isolation circuit 50 may include a combiner formed by the second low-pass filter 50L and the high-pass filter 50H, the second low-pass filter 50L allows low-frequency signals to pass through and attenuates high-frequency signals, while the high-pass filter 50H allows high-frequency signals to pass through and attenuates low-frequency signals. The second low-pass filter 50L and the high-pass filter 50H are combined together to form a combiner, which can achieve separation of low-frequency signals and high-frequency signals. When the electronic device 111 requires near-field communication, the second antenna 402 is used as a near-field communication antenna, and works together with the first antenna 401 to achieve signal communication effects between the near-field communication control chip 10. At this time, the isolation circuit 50 can prevent high-frequency signals from affecting the transmission of low-frequency signals during near-field communication when the near-field communication system 000 is working. When the electronic device 111 does not need near-field communication, the second antenna 402 is still used as a high-frequency communication antenna. At this time, the high-frequency communication performance of the electronic device 111 is achieved through the control of the high-frequency communication control chip 70 and the adjustment of the high-frequency impedance matching circuit 80. The isolation circuit 50 can prevent low-frequency signals from affecting high-frequency signal transmission during high-frequency communication by the second antenna 402 of the electronic device 111.

[0062] It is understandable that this embodiment does not elaborate on the structure and principle of how the high-frequency communication control chip 70 and the high-frequency impedance matching circuit 80 communicate high-frequency signals with the second antenna 402. For details, please refer to the high-frequency communication structure of electronic equipment in related technologies for understanding.

[0063] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0064] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A near field communication system, characterized in that: At least includes a near field communication control chip, a first low-pass filter, a first impedance matching circuit, a second impedance matching circuit, a first antenna and a second antenna; wherein the first antenna is a near field communication antenna, and the second antenna is any one of a near field communication antenna and a high frequency communication antenna; The near field communication control chip comprises a first transmitting end and a second transmitting end, wherein the first transmitting end and the second transmitting end are respectively connected to two input ends of the first low-pass filter; The first impedance matching circuit is connected between two output ends of the first low-pass filter and the first antenna, and the second impedance matching circuit is connected between one output end of the first low-pass filter and the second antenna; When the second antenna is a near field communication antenna, the second impedance matching circuit is connected to the second antenna; When the second antenna is a high-frequency communication antenna, an isolation circuit is further included between the second impedance matching circuit and the second antenna.

2. The near field communication system according to claim 1, characterized in that: The second antenna is a high frequency communication antenna; The isolation circuit includes a second low-pass filter and a high-pass filter, the input end of the second low-pass filter is connected to the output end of the second impedance matching circuit, and the output end of the high-pass filter and the output end of the second low-pass filter are both connected to the second antenna.

3. The near field communication system according to claim 2, characterized in that: The first impedance matching circuit includes two first capacitors and two second capacitors, one end of the two first capacitors is connected to the two output ends of the first low-pass filter respectively, the other end of the two first capacitors is connected to one end of the two second capacitors respectively, and the other end of the two second capacitors is grounded; The second impedance matching circuit includes a third capacitor and a fourth capacitor, one end of the third capacitor is connected to an output end of the first low-pass filter, the other end of the third capacitor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is grounded; One end of the isolation circuit is connected between the third capacitor and the fourth capacitor, and the other end of the isolation circuit is connected to the second antenna.

4. The near field communication system according to claim 1, characterized in that: The equivalent impedance formed by the first impedance matching circuit and the first antenna is a first equivalent impedance, and the equivalent impedance formed by the second impedance matching circuit and the second antenna is a second equivalent impedance; wherein the first equivalent impedance is greater than the second equivalent impedance.

5. The near field communication system according to claim 1, characterized in that: The first low-pass filter includes two fifth capacitors and two first inductors; One ends of the two first inductors are respectively connected to the first transmitting end and the second transmitting end, the other ends of the two first inductors are respectively connected to one ends of the two fifth capacitors, and the other ends of the two fifth capacitors are both grounded.

6. The near field communication system according to claim 1, characterized in that: The near field communication control chip also includes a first receiving end and a second receiving end; The first receiving end and the second receiving end are connected to the first antenna via a peripheral receiving circuit; The first receiving end and the second receiving end are connected to the second antenna via the peripheral receiving circuit; The first receiving end, the second receiving end, and the peripheral receiving circuit form a receiving circuit.

7. The near field communication system according to claim 6, characterized in that: The peripheral receiving circuit includes two groups of sixth capacitors and first resistors connected in series. The first receiving end is connected to an output end of the first low-pass filter through one group of the sixth capacitors and the first resistor connected in series, and the second receiving end is connected to the other output end of the first low-pass filter through another group of the sixth capacitors and the first resistor connected in series.

8. An electronic device, characterized in that: A near field communication system comprising any one of claims 1 to 7.

9. The electronic device according to claim 8, characterized in that: The second antenna is a high frequency communication antenna; The electronic device comprises a main body area and a frame area at least partially surrounding the main body area; The second antenna is located in the border area, and the first antenna is located in the main body area.

10. The electronic device according to claim 9, characterized in that: The electronic device further comprises a high-frequency communication control chip and a high-frequency impedance matching circuit, wherein the high-frequency communication control chip is connected to the second antenna via the high-frequency impedance matching circuit; The isolation circuit includes a second low-pass filter and a high-pass filter, the input end of the second low-pass filter is connected to the output end of the second impedance matching circuit, and the input end of the high-pass filter is connected to the output end of the high-frequency impedance matching circuit. An output end of the high-pass filter and an output end of the second low-pass filter are both connected to the second antenna.

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