Near field communication device and electronic equipment

Abstract

The utility model provides a near field communication device and electronic equipment, the near field communication device is arranged on the electronic equipment, the electronic equipment comprises a cellular antenna, and the near field communication device comprises a near field communication chip, a first near field communication antenna and a second near field communication antenna; the near field communication chip comprises a first port and a second port, the first port is electrically connected with the first near field communication antenna, the first near field communication antenna is electrically connected with the second near field communication antenna, and the second near field communication antenna is electrically connected with the second port; the second near field communication antenna is located near the cellular antenna, and the second near field communication antenna is arranged in a zigzag shape. According to the near field communication device and the electronic equipment, the current direction is changed by changing the arrangement form of the near field communication antenna adjacent to the cellular antenna, so that interference resonance coupled with the cellular antenna is effectively removed.

Description

Technical Field

[0001] This specification relates to the field of communications, and in particular, to a near field communication device and an electronic device. Background Art

[0002] A near field communication (NFC) device is a wireless communication technology that uses radio waves to transmit information between devices based on radio frequency identification and Internet technology. Due to its secure and convenient features, near field communication devices are widely used in various electronic devices to implement various functions, such as electronic payment, identity authentication, card swiping for riding, data exchange, and so on.

[0003] With the development of near field communication technology, the radiation range of near field communication devices on electronic devices also shows an increasing trend to achieve more convenient communication. Existing near field communication devices usually include two near field communication antennas, and the two near field communication antennas are located in different areas of the electronic device. In this way, when the near field communication antenna in any area approaches other near field communication devices, the near field communication function can be achieved.

[0004] However, one of the existing near field communication antennas is arranged near the cellular antenna, which will cause an interference resonance to be coupled out on the cellular antenna by the near field communication antenna. Summary of the Invention

[0005] The purpose of this specification is to provide a near field communication device and an electronic device, which can effectively remove the interference resonance coupled out with the cellular antenna by changing the arrangement form of the near field communication antenna adjacent to the cellular antenna to change the current direction.

[0006] Based on the above purpose, on the one hand, this specification provides a near field communication device provided on an electronic device, the electronic device includes a cellular antenna, and the near field communication device includes a near field communication chip, a first near field communication antenna, and a second near field communication antenna; the near field communication chip includes a first port and a second port, the first port is electrically connected to the first near field communication antenna, the first near field communication antenna is electrically connected to the second near field communication antenna, and the second near field communication antenna is electrically connected to the second port; the second near field communication antenna is located near the cellular antenna, and the second near field communication antenna is arranged in a zigzag shape.

[0007] Further, the second near field communication antenna is formed by bending a straight wire.

[0008] Further, a flexible circuit board is provided on the electronic device, and both the cellular antenna and the second near field communication antenna are provided on the flexible circuit board.

[0009] Further, first and second feed points are respectively provided at two ends of the second near - field communication antenna. The first feed point is electrically connected to the second port, the second feed point is electrically connected to one end of the first near - field communication antenna, and the other end of the first near - field communication antenna is electrically connected to the first port.

[0010] Further, a first anti - interference circuit is further included. Two ends of the first anti - interference circuit are respectively electrically connected to the first feed point and the second port.

[0011] Further, the first anti - interference circuit includes a first inductor and a first capacitor. One end of the first inductor is electrically connected to the first feed point, the other end of the first inductor is respectively electrically connected to one end of the first capacitor and the second port, and the other end of the first capacitor is grounded.

[0012] Further, a second anti - interference circuit is further included. Two ends of the second anti - interference circuit are respectively electrically connected to the second feed point and the first near - field communication antenna.

[0013] Further, the second anti - interference circuit includes a second inductor and a second capacitor. One end of the second inductor is electrically connected to the second feed point, the other end of the second inductor is respectively electrically connected to one end of the second capacitor and the first near - field communication antenna, and the other end of the second capacitor is grounded.

[0014] Further, the first near - field communication antenna and the second near - field communication antenna are located in different areas of the electronic device.

[0015] On the other hand, this specification provides an electronic device, which includes the near - field communication device as described above.

[0016] In the near - field communication device of this specification, by changing the arrangement form of the second near - field communication antenna to change the current direction, the interference resonance coupled out with the cellular antenna can be effectively removed; by setting the first anti - interference circuit and / or the second anti - interference circuit, the electrical length of the circuit can be changed, so as to further eliminate the interference resonance on the cellular antenna and improve the performance of the cellular antenna. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of an existing near - field communication device;

[0018] Figure 2 is a schematic diagram of the arrangement form of the cellular antenna and the second near - field communication antenna of an existing near - field communication device;

[0019] Figure 3 is a schematic diagram of the arrangement form of the cellular antenna and the second near - field communication antenna according to the embodiment of this specification;

[0020] Figure 4 Circuit diagram of the first anti-interference circuit according to an embodiment of the present specification;

[0021] Figure 5 Circuit diagram of the second anti-interference circuit according to an embodiment of the present specification. Detailed implementation manners

[0022] To make the objectives, technical solutions and advantages of the present specification clearer, the technical solutions of the present specification will be clearly and completely described below in conjunction with specific embodiments of the present specification and the corresponding drawings. Apparently, the described embodiments are only a part of the embodiments of the present specification, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present specification without any creative efforts shall fall within the scope of protection of the present specification.

[0023] Such as Figure 1As shown, existing near-field communication devices generally include a near-field communication chip 100, a first near-field communication antenna 200, and a second near-field communication antenna 300. The near-field communication chip 100 includes a first port TX1 and a second port TX2. The first port TX1 is electrically connected to the first near-field communication antenna 200, the first near-field communication antenna 200 is electrically connected to the second near-field communication antenna 300, and the second near-field communication antenna 300 is electrically connected to the second port TX2. Thus, the near-field communication chip 100, the first near-field communication antenna 200, and the second near-field communication antenna 300 can be interconnected to form a loop. When any one of the first near-field communication antenna 200 and the second near-field communication antenna 300 of the near-field communication device approaches the near-field communication antenna of another near-field communication device, they will form an electromagnetic field, and data transmission can be achieved through the change of the electromagnetic field. Specifically, when two near-field communication devices approach each other, one of the two near-field communication devices will generate an alternating current on its near-field communication antenna through its near-field communication chip. The near-field communication antenna can generate an electromagnetic field with a specific frequency (such as 13.56 MHz) through the alternating current. The near-field communication antenna of the other of the two near-field communication devices will sense this electromagnetic field and generate an induced current. The induced current is transmitted to the near-field communication chip through the near-field communication antenna, and then processed by the near-field communication chip to obtain the original data carried by it. In this way, data transmission can be achieved. The near-field communication device can be set on an electronic device. The first near-field communication antenna 200 and the second near-field communication antenna 300 are located in different areas of the electronic device. Thus, the induction range of the near-field communication device can be expanded. When the near-field communication antenna in any area approaches the near-field communication antenna of another near-field communication device, near-field communication between electronic devices can be achieved, making the electronic device more convenient. There is usually also a cellular antenna 400 for wireless communication on the electronic device. Due to the space limitation on the electronic device, the second near-field communication antenna 300 needs to be set in the area where the cellular antenna 400 is located, that is, near the cellular antenna 400. For example, the electronic device can be a smart phone. The cellular antenna 400 is usually set at the top of the phone, the first near-field communication antenna 200 is usually set on the back of the phone, and the second near-field communication antenna 300 is set at the top of the phone, near the cellular antenna 400. In this way, when the back or the top of the phone approaches other near-field communication devices, near-field communication can be achieved, thus improving the convenience of using the phone.

[0024] As Figure 2 shown, the existing second near-field communication antenna 300 basically extends linearly, with two feeding points provided thereon. The current flows from one feeding point to the other feeding point, and the current direction is also basically linear (see Figure 2In the direction of the dashed arrow in the figure, since the second near-field communication antenna 300 is adjacent to the cellular antenna 400, an interference resonance will be coupled on the cellular antenna 400 (the resonance position is 2300 - 3400 MHz), resulting in the performance of the cellular antenna 400 being affected.

[0025] To solve the above problems, the embodiments of this specification provide a near-field communication device. Based on the existing near-field communication device, the arrangement form of the second near-field communication antenna 300 is changed to change the current direction on the second near-field antenna 300, thereby changing the coupling direction between the second near-field communication antenna 300 and the cellular antenna 400, so as to reduce the interference resonance on the cellular antenna 400 and improve the performance of the cellular antenna 400.

[0026] As Figure 3 shown, the difference of the near-field communication device in the embodiments of this specification is that: the second near-field communication antenna 300 changes from a linear arrangement to a zigzag arrangement, and thus the current direction on it also becomes zigzag (see the direction of the dashed arrow in the figure Figure 3 ), and by changing the current direction, the interference resonance on the cellular antenna 400 can be effectively removed.

[0027] In one or more embodiments of this specification, the second near-field communication antenna 300 can be formed by bending a straight wire any number of times; the shape of the second near-field communication antenna 300 can be a curve, a helix, a wavy line, a broken line, or any other suitable shape.

[0028] In one or more embodiments of this specification, to make full use of the space of the electronic device, the second near-field communication antenna 300 and the cellular antenna 400 can be arranged on the same flexible circuit board 500.

[0029] In one or more embodiments of this specification, the two ends of the second near-field communication antenna 300 are respectively provided with a first feed point 310 and a second feed point 320. The first feed point 310 is electrically connected to the second port TX2 of the near-field communication chip 100, the second feed point 320 is electrically connected to one end of the first near-field communication antenna 300, and the other end of the first near-field communication antenna 300 is electrically connected to the first port TX1 of the near-field communication chip 100.

[0030] As Figure 4As shown, in one or more embodiments of this specification, the near-field communication device may further include a first anti-interference circuit 600, which is disposed between the first feeding point 310 of the second near-field communication antenna 300 and the second port TX2 of the near-field communication chip 100, that is, both ends of the first anti-interference circuit 600 are electrically connected to the first feeding point 310 and the second port TX2 respectively. The first anti-interference circuit 600 is used to change the electrical length of the circuit to change the length of the interference resonance, so as to eliminate the interference resonance on the cellular antenna 400 and improve the performance of the cellular antenna. Specifically, the first anti-interference circuit 600 may include a first inductor L1 and a first capacitor C1. One end of the first inductor L1 is electrically connected to the first feeding point 310, the other end of the first inductor L1 is electrically connected to one end of the first capacitor C1 and the second port TX2 of the near-field communication chip 100 respectively, and the other end of the first capacitor C1 is grounded. In this way, it is equivalent to connecting an inductor to the ground, so the electrical length of the circuit (i.e., a measure of the time required for an electromagnetic wave to propagate in the circuit) can be changed. By adjusting the value of the first inductor L1, the electrical length can be adjusted, so as to eliminate the clutter on the cellular antenna 400, that is, the interference resonance.

[0031] As Figure 5 As shown, in one or more embodiments of this specification, the near-field communication device may further include a second anti-interference circuit 700, which is disposed between the second feeding point 320 and the first near-field communication antenna 300, that is, both ends of the second anti-interference circuit 700 are electrically connected to the second feeding point 320 and the first near-field communication antenna 300 respectively. The second anti-interference circuit 700 is used to change the electrical length of the circuit to change the length of the interference resonance, so as to eliminate the interference resonance on the cellular antenna 400 and improve the performance of the cellular antenna 400. Specifically, the second anti-interference circuit 700 may include a second inductor L2 and a second capacitor C2. One end of the second inductor L2 is electrically connected to the second feeding point 320, the other end of the second inductor L2 is electrically connected to one end of the second capacitor C2 and the first near-field communication antenna 200 respectively, and the other end of the second capacitor C2 is grounded. In this way, it is equivalent to connecting an inductor to the ground, so the electrical length of the circuit (i.e., a measure of the time required for an electromagnetic wave to propagate in the circuit) can be changed. By adjusting the value of the second inductor L2, the electrical length can be adjusted, so as to eliminate the clutter on the cellular antenna 400, that is, the interference resonance.

[0032] It can be understood that the first anti-interference circuit 600 and the second anti-interference circuit 700 may be separately provided or provided simultaneously, and this specification does not limit this. For example, in some embodiments, the near-field communication device may only include the first anti-interference circuit 600 and not include the second anti-interference circuit 700; in some other embodiments, the near-field communication device may only include the second anti-interference circuit 700 and not include the first anti-interference circuit 600; in still some other embodiments, the near-field communication device may include both the first anti-interference circuit 600 and the second anti-interference circuit 700.

[0033] In the near - field communication device according to the embodiments of this specification, by changing the arrangement form of the second near - field communication antenna 300, the current direction is changed, thereby effectively removing the interference resonance coupled out with the cellular antenna 400; by setting the first anti - interference circuit 600 and / or the second anti - interference circuit 700, the electrical length of the circuit can be changed, thereby further eliminating the interference resonance on the cellular antenna 400 and improving the performance of the cellular antenna 400.

[0034] The embodiments of this specification also provide an electronic device, which includes a cellular antenna 400 and the near - field communication device as described in the above embodiments. The second near - field communication antenna 300 of the near - field communication device is located near the cellular antenna 400. Specifically, the cellular antenna 400 and the second near - field communication antenna 300 can be located on the same flexible circuit board 500.

[0035] In one or more embodiments of this specification, the electronic device can be a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0036] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non - exclusive inclusion, such that a process, method, commodity or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, commodity or device including the said element.

[0037] The above description is only for the embodiments of this specification and is not used to limit this specification. For those skilled in the art, various changes and modifications can be made to this specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this specification shall be included within the scope of the claims of this specification.

Claims

1. A near-field communication device, characterized in that, It is provided on an electronic device, the electronic device includes a cellular antenna, and the near-field communication device includes a near-field communication chip, a first near-field communication antenna, and a second near-field communication antenna; the near-field communication chip includes a first port and a second port, the first port is electrically connected to the first near-field communication antenna, the first near-field communication antenna is electrically connected to the second near-field communication antenna, and the second near-field communication antenna is electrically connected to the second port; The second near-field communication antenna is located near the cellular antenna, and the second near-field communication antenna is arranged in a zigzag shape.

2. The near field communication device according to claim 1, wherein The second near-field communication antenna is formed by bending a straight wire.

3. The near field communication device according to claim 1, wherein A flexible circuit board is provided on the electronic device, and both the cellular antenna and the second near-field communication antenna are provided on the flexible circuit board.

4. The near field communication device according to claim 1, characterized in that First and second feed points are respectively provided at two ends of the second near-field communication antenna, the first feed point is electrically connected to the second port, the second feed point is electrically connected to one end of the first near-field communication antenna, and the other end of the first near-field communication antenna is electrically connected to the first port.

5. The near field communication device according to claim 4, characterized in that, It further includes a first anti-interference circuit, and two ends of the first anti-interference circuit are respectively electrically connected to the first feed point and the second port.

6. The near field communication device according to claim 5, wherein, The first anti-interference circuit includes a first inductor and a first capacitor. One end of the first inductor is electrically connected to the first feed point, the other end of the first inductor is respectively electrically connected to one end of the first capacitor and the second port, and the other end of the first capacitor is grounded.

7. The near field communication device according to claim 4, characterized in that It further includes a second anti-interference circuit, and two ends of the second anti-interference circuit are respectively electrically connected to the second feed point and the first near-field communication antenna.

8. The near field communication device according to claim 7, characterized in that, The second anti-interference circuit includes a second inductor and a second capacitor. One end of the second inductor is electrically connected to the second feed point, the other end of the second inductor is respectively electrically connected to one end of the second capacitor and the first near-field communication antenna, and the other end of the second capacitor is grounded.

9. The near field communication device according to claim 1, characterized in that, The first near-field communication antenna and the second near-field communication antenna are located in different areas of the electronic device.

10. An electronic device, characterized in that, It includes the near-field communication device according to any one of claims 1-9.

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