An external NFC antenna

Abstract

The utility model belongs to external NFC antenna technical field discloses a kind of external NFC antennas, including antenna mainboard, shell, wiring terminal and twisted pair extension line, antenna mainboard is fixedly installed in the inside of shell, one end of twisted pair extension line is electrically connected with antenna mainboard, the other end of twisted pair extension line is electrically connected with wiring terminal, coil wiring is provided on antenna mainboard, the length of coil wiring is 50~200mm, line width 0.5~1mm, thickness is 1-3oz, coil wiring is concave character shape circle shape setting, the utility model is integrated by external NFC antenna and vehicle-mounted controller, the redundant design of independent NFC controller in prior art is saved, greatly reduce the design cost of whole vehicle, and different vehicle-mounted controller mounting position of different vehicle model can be flexibly adapted.

Description

Technical Field

[0001] This utility model relates to the field of external NFC antenna technology, and in particular to an external NFC antenna. Background Technology

[0002] With the development of science and technology, vehicle controllers with NFC digital key functionality (such as central controllers and domain controllers) are being used more and more widely in vehicles such as cars, motorcycles, and electric vehicles.

[0003] However, due to limitations in vehicle layout design, the installation location of the vehicle controller is often in a confined space that is difficult for users to access. In this case, to realize the NFC digital key function that allows users to conveniently swipe their cards, existing technologies typically design the NFC function as a separate NFC controller (which includes components such as an NFC main chip, NFC antenna, microcontroller, and power module), and install it in a location easily accessible to the user on the vehicle. At the same time, this separate NFC controller needs to interact with the vehicle controller via the body bus to complete the NFC unlocking function of the entire vehicle.

[0004] The above solution requires an additional independent NFC controller, which significantly increases the overall vehicle design cost. Furthermore, due to the different installation locations of the on-board controllers for different vehicle models, the existing independent NFC controller layout is difficult to flexibly adapt to various vehicle models, requiring redundant design, which further increases the cost and adaptation difficulty.

[0005] To address this, an external NFC antenna is proposed. Utility Model Content

[0006] The purpose of this invention is to provide an external NFC antenna, thereby solving or at least alleviating one or more of the aforementioned problems and other issues existing in the prior art.

[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0008] An external NFC antenna includes an antenna motherboard, a housing, a terminal block, and a twisted-pair extension cable. The antenna motherboard is fixedly installed inside the housing. One end of the twisted-pair extension cable is electrically connected to the antenna motherboard, and the other end of the twisted-pair extension cable is electrically connected to the terminal block. The terminal block is electrically connected to the input interface of an NFC chip integrated on a vehicle controller.

[0009] According to the present invention, an external NFC antenna is provided on the antenna motherboard, wherein the coil trace has a length of 50-200mm, a width of 0.5-1mm, and a thickness of 1-3oz.

[0010] In an external NFC antenna according to the present invention, the coil trace is arranged in a concave loop shape, and the number of turns of the coil trace is 3.

[0011] In an external NFC antenna according to the present invention, the twist pitch D of the twisted pair extension cable is 10-25mm.

[0012] In an external NFC antenna according to the present invention, the diameter of the twisted pair extension cable is 0.3-0.8 mm and the length is 0.5-5 m.

[0013] In an external NFC antenna according to the present invention, both ends of the coil trace are provided with a power supply terminal, and the twisted pair extension line is electrically connected to the power supply terminal.

[0014] In an external NFC antenna according to the present invention, the feed terminal is disposed near the opening of the coil trace arranged in a U-shaped loop structure.

[0015] In an external NFC antenna according to the present invention, a positioning hole is provided on the antenna motherboard, and a positioning protrusion adapted to the positioning hole is integrally formed inside the housing, and the positioning hole is sleeved on the positioning protrusion.

[0016] In an external NFC antenna according to the present invention, mounting ears are integrally formed on both sides of the bottom of the housing.

[0017] This utility model has at least the following beneficial effects:

[0018] By integrating the external NFC antenna with the vehicle controller, the redundant design of the independent NFC controller in the existing technology is eliminated, which greatly reduces the overall vehicle design cost and can be flexibly adapted to the installation position of the vehicle controller of different models. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the antenna mainboard of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the shell of this utility model.

[0023] Explanation of icon numbers:

[0024] 1. Antenna mainboard; 101. Antenna wiring; 102. Feed terminal; 103. Positioning hole; 2. Housing; 201. Mounting ear; 3. Wiring terminal; 4. Twisted pair extension cable. Detailed Implementation

[0025] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0026] Please refer to Figures 1 to 3 As shown, an embodiment of this utility model provides an external NFC antenna, including an antenna main board 1, a housing 2, a terminal block 3, and a twisted pair extension cable 4. The antenna main board 1 is fixedly installed inside the housing 2. One end of the twisted pair extension cable 4 is electrically connected to the antenna main board 1, and the other end of the twisted pair extension cable 4 is electrically connected to the terminal block 3. The terminal block 3 is electrically connected to the input interface of the NFC chip integrated on the vehicle controller.

[0027] Working principle: The antenna motherboard 1 is the core carrier for NFC signal transmission and reception. The housing 2 protects the antenna motherboard 1 (such as preventing bumps and water). The twisted pair extension cable 4 enables the signal extension and transmission between the antenna motherboard 1 and the NFC chip integrated on the car controller. The terminal block 3 is used to establish a detachable electrical connection with the NFC chip integrated on the car controller. The entire system achieves external installation of the NFC antenna through the cooperation of various components, so that the NFC function can be flexibly adapted to different installation positions.

[0028] Specifically, in this embodiment, the antenna mainboard 1 is provided with a coil trace 101, the coil trace 101 having a length of 50-200mm, a width of 0.5-1mm, and a thickness of 1-3oz.

[0029] The coil trace 101 is a key structure on the antenna motherboard 1 used for sensing and transmitting NFC signals. Its length, width and thickness are designed to match the NFC operating frequency, achieve impedance control, and ensure that NFC signals can be transmitted and received efficiently, providing a foundation for near-field communication.

[0030] Furthermore, in this embodiment, the coil trace 101 is arranged in a U-shaped loop, and the number of turns of the coil trace 101 is 3.

[0031] The U-shaped coil trace 101 optimizes the sensing range and strength of the NFC signal through a specific shape and number of turns. The U-shaped structure facilitates signal focusing, and the three turns ensure signal strength while avoiding electromagnetic interference caused by excessive winding, thus adapting to the short-range signal interaction requirements of near-field communication.

[0032] In this embodiment, the twist pitch D of the twisted pair extension cable 4 is 10-25mm.

[0033] The twist pitch D of the twisted pair extension cable 4 is designed to be 10-25mm. The twisted structure of the twisted pair cable cancels out electromagnetic interference in the external environment. The specific twist pitch ensures that the attenuation of the NFC signal is reduced during the extended transmission process, and the stability of the signal transmission is maintained.

[0034] In this embodiment, the twisted pair extension cable 4 has a wire diameter of 0.3 to 0.8 mm and a length of 0.5 to 5 m.

[0035] The wire diameter of the twisted pair extension cable 4 ensures sufficient physical strength and conductivity. Its length of 0.5 to 5m can be flexibly adapted to the installation position of the vehicle controller in different models, realizing long-distance connection between the external antenna and the controller. At the same time, the wire diameter parameter and twist pitch ensure signal transmission efficiency.

[0036] In this embodiment, both ends of the coil trace 101 are provided with a power supply terminal 102, and the twisted pair extension line 4 is electrically connected to the power supply terminal 102.

[0037] The power supply terminal 102 is the electrical connection interface between the coil trace 101 and the twisted pair extension cable 4. It is used to transmit the NFC signal sensed by the coil trace 101 to the NFC chip integrated on the vehicle controller through the twisted pair extension cable 4, and at the same time receive the drive signal of the NFC chip integrated on the vehicle controller to realize bidirectional signal transmission.

[0038] Furthermore, in this embodiment, the power supply terminal 102 is located near the opening of the coil trace 101, which is arranged in a U-shaped loop structure.

[0039] The power supply terminal 102 is positioned near the opening of the U-shaped coil trace 101, which can reduce the interference of the power supply line on the magnetic field distribution of the coil, ensure that the signal sensing area of ​​the U-shaped coil is more concentrated, and improve the stability and efficiency of NFC communication.

[0040] In this embodiment, the antenna main board 1 has a positioning hole 103, and the housing 2 has an integrally formed positioning protrusion that matches the positioning hole 103. The positioning hole 103 is fitted onto the positioning protrusion.

[0041] The positioning hole 103 of the antenna motherboard 1 cooperates with the positioning protrusion of the housing 2 to achieve precise fixation of the antenna motherboard 1 in the housing 2, avoid the displacement of the antenna motherboard 1 due to vibration, etc., ensure the stability of the coil trace 101, and maintain the consistency of NFC signal transmission and reception.

[0042] In this embodiment, mounting ears 201 are integrally formed on both sides of the bottom of the housing 2.

[0043] The mounting ears 201 on both sides of the bottom of the housing 2 are used to fix the entire external NFC antenna in a position that is easy for users to operate in the vehicle, such as near the door or center console, to achieve a stable installation of the antenna, ensure the signal sensing effect when the user swipes the card, and adapt to the installation requirements of different vehicle models.

[0044] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the present invention's conception through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. An external NFC antenna, characterized in that, The device includes an antenna main board (1), a housing (2), a terminal block (3), and a twisted pair extension cable (4). The antenna main board (1) is fixedly installed inside the housing (2). One end of the twisted pair extension cable (4) is electrically connected to the antenna main board (1), and the other end of the twisted pair extension cable (4) is electrically connected to the terminal block (3). The terminal block (3) is electrically connected to the input interface of the NFC chip integrated on the vehicle controller.

2. An external NFC antenna according to claim 1, characterized in that: The antenna mainboard (1) is provided with coil traces (101), the coil traces (101) are 50-200mm long, 0.5-1mm wide, and 1-3oz thick.

3. An external NFC antenna according to claim 2, characterized in that: The coil trace (101) is arranged in a U-shaped loop, and the number of turns of the coil trace (101) is 3.

4. An external NFC antenna according to claim 1, characterized in that: The twist pitch D of the twisted pair extension cable (4) is 10-25 mm.

5. An external NFC antenna according to claim 1, characterized in that: The twisted pair extension cable (4) has a wire diameter of 0.3 to 0.8 mm and a length of 0.5 to 5 m.

6. An external NFC antenna according to claim 1, characterized in that: Both ends of the coil trace (101) are provided with power supply terminals (102), and the twisted pair extension cable (4) is electrically connected to the power supply terminals (102).

7. An external NFC antenna according to claim 6, characterized in that: The power supply terminal (102) is located near the opening of the coil trace (101) which is arranged in a U-shaped loop structure.

8. An external NFC antenna according to claim 1, characterized in that: The antenna main board (1) has a positioning hole (103), and the housing (2) has an integrally formed positioning protrusion that matches the positioning hole (103). The positioning hole (103) is fitted onto the positioning protrusion.

9. An external NFC antenna according to any one of claims 1-8, characterized in that: The bottom two sides of the housing (2) are integrally formed with mounting ears (201).

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