Multi-NFC antenna device

Abstract

The invention relates to the technical field of short-distance wireless communication, and particularly discloses a multi-NFC antenna device which comprises a device body, a mainboard, a first antenna and a second antenna. The main board, the first antenna and the second antenna are respectively arranged in the equipment main body; a driving chip is arranged on the mainboard; the driving chip is respectively connected with the first antenna and the second antenna, and the first antenna is connected with the second antenna to form an induction loop. According to the scheme, at least the first antenna and the second antenna are arranged in the equipment main body, and the first antenna and the second antenna are mutually connected to form the loop, so that when the NFC signal source is close to the first antenna or the second antenna, the NFC signal source can be effectively read, and the effect of improving the applicability of the equipment is achieved. Meanwhile, the first antenna and the second antenna in the scheme are both connected with the same mainboard chip, so that the cost can be saved.

Description

Technical Field

[0001] The present application relates to the technical field of short-range wireless communication, and in particular to a multi-NFC antenna device. Background Art

[0002] NFC (Near Field Communication) is a short-range high-frequency wireless communication technology. When two NFC-enabled devices are close to each other (usually less than 10 cm), the NFC chips inside them will establish a communication connection through magnetic field induction.

[0003] NFC technology is widely used in the fields of mobile payment, identity recognition, and smart tags. In existing electronic devices, the NFC antenna is generally placed on the side of the device, so that users need to place the device close to the NFC signal source in a specific direction and angle for it to work properly, resulting in limited usage scenarios. Summary of the invention

[0004] In view of this, an object of the present application is to provide a multi-NFC antenna device to improve the applicability of the device.

[0005] In order to achieve the above technical objectives, the present application provides a multi-NFC antenna device, including: a device body, a main board, a first antenna and a second antenna;

[0006] The mainboard, the first antenna and the second antenna are respectively arranged in the device body;

[0007] A driving chip is arranged on the main board;

[0008] The driving chip is connected to the first antenna and the second antenna respectively, and the first antenna is connected to the second antenna to form an induction loop.

[0009] Furthermore, the first antenna and the second antenna are respectively connected to a ground wire on the mainboard.

[0010] Furthermore, the first antenna is connected to the first pin of the driving chip through a spring;

[0011] The second antenna is connected to the second pin of the driving chip through a spring.

[0012] Furthermore, the first antenna is connected to the ground wire on the mainboard through a spring;

[0013] The second antenna is connected to the ground wire on the mainboard through a spring.

[0014] Further, the sum of the matching value of the first pin and the first antenna impedance value is equal to the sum of the matching value of the second pin and the second antenna impedance value.

[0015] Furthermore, the first antenna and the second antenna are respectively arranged on two sides of the mainboard;

[0016] Two of the spring sheets are disposed on the surface of the mainboard that is opposite to the first antenna and the second antenna;

[0017] One of the springs is connected to the driving chip, and is used to connect the driving chip to the first antenna or the second antenna;

[0018] Another of the spring pieces is connected to the ground wire of the mainboard, and is used to connect the ground wire of the mainboard to the first antenna or the second antenna.

[0019] Furthermore, the first antenna and / or the second antenna is frame-shaped.

[0020] Further, a projection of the second antenna on the mainboard overlaps with a projection of the first antenna on the mainboard.

[0021] Furthermore, the first antenna and the second antenna are of the same or different sizes.

[0022] Furthermore, the device body is provided with a screen and a back cover;

[0023] The first antenna is arranged on a side of the mainboard close to the screen, and the second antenna is arranged on a side of the mainboard close to the back cover.

[0024] It can be seen from the above technical solution that the present application provides a multi-NFC antenna device, including: a device body, a main board, a first antenna and a second antenna; the main board, the first antenna and the second antenna are respectively arranged in the device body; a driving chip is arranged on the main board; the driving chip is respectively connected to the first antenna and the second antenna, and the first antenna is connected to the second antenna to form an induction loop.

[0025] In this solution, at least a first antenna and a second antenna are disposed inside the device body, and the first antenna and the second antenna are connected to each other to form a loop, so that when the NFC signal source is close to the first antenna or the second antenna, both can be effectively read, thereby achieving the effect of improving the applicability of the device. At the same time, in this solution, the first antenna and the second antenna are connected to the same motherboard chip, which can save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 A schematic side perspective diagram of the structure of a multi-NFC antenna device provided in an embodiment of the present application;

[0028] Figure 2 A circuit connection diagram of a multi-NFC antenna device provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of a mainboard and antenna of a multi-NFC antenna device provided in an embodiment of the present application being connected via a spring clip;

[0030] Figure 4 A top view of the structure of a multi-NFC antenna device provided in an embodiment of the present application;

[0031] In the figure: 10, device body; 11, screen; 20, main board; 21, first pin; 22, second pin; 23, spring; 30, first antenna; 40, second antenna. DETAILED DESCRIPTION

[0032] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the specification of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection requested by the present application.

[0033] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a replaceable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0035] See also Figure 1 A multi-NFC antenna device provided in an embodiment of the present application includes: a device body 10, a main board 20, a first antenna 30 and a second antenna 40. The device body 10 can be, for example, a main body of an electronic device such as a mobile phone, a tablet, a POS machine, a PDA, etc.

[0036] The first antenna 30 is disposed in the device body 10. For the sake of convenience, in this embodiment, the device body 10 is placed horizontally with its display surface facing upward; the first antenna 30 can be located in an area close to the top surface of the device body 10 along the first direction. The first direction is perpendicular to the plane direction of the device body 10 and is also Figure 1 The first antenna 30 may be disposed near the top surface of the device body 10 .

[0037] The second antenna 40 is disposed in the device body 10 ; in this embodiment, the second antenna may be located in a region close to the bottom surface of the device body 10 along the first direction, that is, the second antenna 40 is located below the first antenna 30 .

[0038] A driving chip is disposed on the mainboard 20; the driving chip is connected to the first antenna 30 and the second antenna 40 respectively; the first antenna 30 is connected to the second antenna 40 to form an induction loop. The first antenna 30 and the second antenna 40 can be connected by an electrical connection such as a cable.

[0039] In this embodiment, by arranging the first antenna 30 and the second antenna 40 in the device body 10, the receiving range of the device for signals can be increased, so that the device can cover a wider space and can better capture and send signals from different angles and at different positions. At the same time, since the first antenna 30 and the second antenna 40 are interconnected to form a loop, the two antennas can work at the same time, playing a role in signal complementation. In a complex electromagnetic environment, a single antenna may be interfered with and cause signal fluctuations. The dual antenna system can filter and merge signals using the signal processing technology built into the mainboard 20 to enhance signal stability.

[0040] When the device is placed on a surface of a different material (such as a metal surface or the plastic / leather surface of the device's outer sheath), a single antenna may be shielded or reflected by the surface material, resulting in signal attenuation. In this embodiment, a signal sensing switching program is provided in the mainboard 20, which enables the first antenna 30 and the second antenna 40 to adjust their respective working states. Specifically, the signal sensing switching program of the mainboard 30 means that the mainboard 30 can obtain the strength of the signal felt by the first antenna 30 and the second antenna 40 in real time, and switch the antenna with a strong signal to the main antenna, so that the device can automatically switch the main antenna according to the placement position to adapt to different scenarios, so as to provide more reliable NFC services.

[0041] In this embodiment, the main board 20 is disposed in the device body 10, and the driving chip on the main board 20 is electrically connected to the first antenna 30 and the second antenna 40. The driving chip of the main board 20 is one of the components with higher costs in the device. In this embodiment, the same chip is used to process the signals of the first antenna 30 and the second antenna 40, which can reduce the hardware cost and save the internal space of the device. At the same time, the first antenna 30 and the second antenna 40 are both connected to the driving chip, so that the driving chip can synchronously process the signals from the two antennas, thereby executing the above-mentioned steps such as signal merging and signal sensing switching procedures.

[0042] For more specific examples, see Figure 2 One end of the first antenna 30 is connected to the ground wire on the motherboard 20, and the other end is connected to the first pin 21 of the driving chip on the motherboard 20; one end of the second antenna 40 is connected to the ground wire on the motherboard 20, and the other end is connected to the second pin 22 of the driving chip on the motherboard 20.

[0043] At the same time, in this embodiment, the mainboard 20 controls the first antenna 30 and the second antenna 40 without setting a complex control switch circuit, that is, the requirement of sensing NFC signals on both sides of the device can be met.

[0044] For more specific examples, see Figure 3 The first antenna 30 is connected to the first pin 21 of the driving chip through the spring clip 23; the second antenna 40 is connected to the second pin 22 of the driving chip through the spring clip 23.

[0045] Correspondingly, the first antenna 30 may be connected to the ground wire on the mainboard 20 via the spring clip 23 ; and the second antenna 40 may be connected to the ground wire on the mainboard 20 via the spring clip 23 .

[0046] The shrapnel 23 is usually made of a metal material with excellent conductivity, such as high beryllium copper, etc., which can ensure that the electrical connection between the antenna and the mainboard 20 or the driver chip is stable and reliable, effectively reduce the resistance during signal transmission, and reduce signal attenuation, thereby ensuring good radiation and reception performance of the antenna. At the same time, the shrapnel 23 is elastic and can provide a certain buffer between the antenna and the driver chip and between the antenna and the ground wire. When the device is vibrated, collided or dropped, the shrapnel can absorb and disperse the impact force, reduce damage to the connection between the antenna and the driver chip and the grounding part of the antenna, reduce the risk of connection failure due to physical impact, and improve the reliability and stability of the device.

[0047] In some cases, due to manufacturing tolerances or errors in the device assembly process, there may be a slight height difference between the antenna and the mainboard 20. The elasticity of the spring 23 can make it self-adapt to this height difference within a certain range, ensuring that the antenna and the mainboard 20 always maintain good contact, and there will be no poor contact or connection interruption due to height inconsistency.

[0048] In one embodiment, the sum of the matching value of the first pin 21 and the impedance value of the first antenna 30 is equal to the sum of the matching value of the second pin 22 and the impedance value of the second antenna 40 .

[0049] In practical applications, the impedance value of the first antenna 30 and the impedance value of the second antenna 40 can be directly measured by a network analyzer or other tool, or can be calculated based on the length of the antenna after obtaining the characteristic impedance of the antenna according to the structure of the antenna and the surrounding medium. Specifically, obtaining the impedance value of the antenna is a prior art and will not be described in detail in this embodiment.

[0050] After obtaining the impedance value of the first antenna 30 and the impedance value of the second antenna 40, the matching values ​​of the first pin 21 and the second pin can be adjusted to satisfy: the matching value of the first pin 21 + the impedance value of the first antenna 30 = the matching value of the second pin 22 + the impedance value of the second antenna 40. The antenna structure provided in this embodiment can have better performance when the above formula is satisfied.

[0051] In one embodiment, the first antenna 30 and the second antenna 40 are respectively arranged on both sides of the mainboard 20; two spring clips 23 are arranged on the surfaces of the mainboard 20 opposite to the first antenna 30 and the second antenna 40; one spring clip 23 is connected to the driving chip, and is used to connect the driving chip to the first antenna 30 or the second antenna 40; the other spring clip 23 is connected to the ground wire of the mainboard 20, and is used to connect the ground wire of the mainboard 20 to the first antenna 30 or the second antenna 40.

[0052] by Figure 3For example, two spring clips 23 are disposed on the left and right sides of the mainboard 20, and the first antenna 30 and the second antenna 40 are respectively connected through the two spring clips 23.

[0053] In one embodiment, see Figure 4 , the first antenna 30 and / or the second antenna 40 is frame-shaped.

[0054] The frame-shaped first antenna 30 and second antenna 40 can focus the transmission and reception of signals in a specific direction, thereby enhancing the signal strength in that direction and improving the efficiency and distance of communication.

[0055] As an implementation mode, both sides of the first antenna 30 are arranged near both sides of the device body 10, so that signals near both sides of the device body 10 can also be sensed, thereby improving the sensing range of the device and reducing signal blind spots.

[0056] In one embodiment, the projection of the second antenna 40 on the mainboard overlaps with the projection of the first antenna 30 on the mainboard. In other embodiments, the projection of the second antenna 40 on the mainboard may not overlap with the projection of the first antenna 30 on the mainboard. Specifically, the size of the second antenna 40 may be smaller than the first antenna 30. The size of the second antenna 40 may also be set to be the same as that of the first antenna 30. That is, the size of the first antenna 30 and the size of the second antenna 40 may be the same or different.

[0057] The layout of the first antenna 30 and the second antenna 40 provided in this embodiment can reduce the mutual interference between the antennas to a certain extent. At the same time, the first antenna 30 can shield the influence of the interference signal from above on the second antenna 40 to a certain extent. Similarly, the second antenna 40 can shield the influence of the interference signal from below on the first antenna 30 to a certain extent.

[0058] In one embodiment, a screen 11 and a back cover are disposed on the device body 10; the first antenna 30 is disposed below the screen 11 along a first direction and located on a side of the main board 20 close to the screen 11, which can improve the sensing sensitivity of the first antenna 30. The second antenna 40 is disposed on a side of the main board 20 close to the back cover.

[0059] The above are only preferred embodiments of the present application and are not intended to limit the present invention. Although the present application has been described in detail with reference to the examples, those skilled in the art can still modify the technical solutions recorded in the aforementioned examples or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A multi-NFC antenna device, characterized in that: include: A device body (10), a main board (20), a first antenna (30) and a second antenna (40); The mainboard (20), the first antenna (30) and the second antenna (40) are respectively arranged in the device body; The main board (20) is provided with a driving chip; The driving chip is respectively connected to the first antenna (30) and the second antenna (40); The first antenna (30) is connected to the second antenna (40) to form an induction loop.

2. The multi-NFC antenna device according to claim 1, characterized in that: The first antenna (30) and the second antenna (40) are respectively connected to a ground wire on the mainboard (20).

3. The multi-NFC antenna device according to claim 2, characterized in that: The first antenna (30) is connected to the first pin (21) of the driving chip via a spring sheet (23); The second antenna (40) is connected to the second pin (22) of the driving chip via a spring sheet (23).

4. The multi-NFC antenna device according to claim 3, characterized in that: The first antenna (30) is connected to a ground wire on the mainboard (20) via a spring sheet (23); The second antenna (40) is connected to the ground wire on the mainboard (20) via a spring sheet (23).

5. The multi-NFC antenna device according to claim 3, characterized in that: The sum of the matching value of the first pin (21) and the impedance value of the first antenna (30) is equal to the sum of the matching value of the second pin (22) and the impedance value of the second antenna (40).

6. The multi-NFC antenna device according to claim 4, characterized in that: The first antenna (30) and the second antenna (40) are respectively arranged on two sides of the main board (20); Two of the spring sheets (23) are provided on the surface of the main board (20) that is opposite to the first antenna (30) and the second antenna (40); One of the spring sheets (23) is connected to the driving chip, and is used to connect the driving chip to the first antenna (30) or the second antenna (40); Another of the spring pieces (23) is connected to a ground line of the mainboard (20), and is used to connect the ground line of the mainboard (20) and the first antenna (30) or the second antenna (40).

7. The multi-NFC antenna device according to any one of claims 1 to 6, characterized in that: The first antenna (30) and / or the second antenna (40) are frame-shaped.

8. The multi-NFC antenna device according to claim 7, characterized in that: The projection of the second antenna (40) on the mainboard overlaps with the projection of the first antenna (30) on the mainboard.

9. The multi-NFC antenna device according to claim 7, characterized in that: The first antenna (30) and the second antenna (40) are of the same or different sizes.

10. The multi-NFC antenna device according to claim 6, characterized in that: The device body (10) is provided with a screen (11) and a back cover; The first antenna (30) is arranged on a side of the mainboard close to the screen, and the second antenna is arranged on a side of the mainboard close to the back cover.

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