FPC vehicle antenna

Abstract

The utility model relates to a kind of FPC vehicle-mounted antenna, including antenna main body, antenna main body includes substrate, first radiating arm, second radiating arm, substrate is flexible circuit board;First radiating arm is formed on substrate, first radiating arm is equipped with first gap, second gap, and feed point is formed on first radiating arm;Second radiating arm is formed on substrate, second radiating arm is equipped with third gap, fourth gap, first gap and third gap are symmetrical, second gap and fourth gap are symmetrical, and grounding point is formed on second radiating arm.The FPC substrate of the utility model has the characteristics of small size, light weight, thin thickness, etc., not only can reduce the volume and weight of antenna, but also can improve softness, strengthen in limited space three-dimensional space assembly, can be arranged according to the mechanical structure of automobile component antenna, can be arranged in three-dimensional space with arbitrary bending, so that its available space expands;Antenna overall structure is simple, convenient for processing, green and environmental protection.

Description

Technical Field

[0001] This utility model relates to the field of automotive antenna technology, and in particular to an FPC vehicle-mounted antenna. Background Technology

[0002] The vehicle is equipped with a variety of in-vehicle electronic devices, such as radio receivers, touch screen displays, navigation devices, and mobile phones. These in-vehicle electronic devices are connected to the vehicle antenna via cables. As one of the important components of a car, the vehicle antenna can receive signals from the outside world and transmit signals to other in-vehicle electronic devices.

[0003] With the rapid development of automotive communication technology, vehicle antennas will integrate more communication functions, such as 5G, V2X, Wi-Fi, and BLE. However, the limited space in a car and its aesthetic requirements restrict the integration of more antennas. Therefore, miniaturization and invisibility of vehicle antennas have become urgent problems for engineers to solve. Summary of the Invention

[0004] The purpose of this invention is to provide a lightweight, thin, and flexible ultra-wideband 5G FPC vehicle-mounted antenna.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An FPC vehicle-mounted antenna includes an antenna body, wherein the antenna body comprises:

[0007] The substrate is a flexible circuit board.

[0008] A first radiating arm is formed on the substrate, and a first slit and a second slit are formed on the first radiating arm. A feed point is formed on the first radiating arm.

[0009] The second radiating arm is formed on the substrate. The second radiating arm has a third slit and a fourth slit. The first slit is symmetrical to the third slit, and the second slit is symmetrical to the fourth slit. A grounding point is formed on the second radiating arm.

[0010] Preferably, in the above technical solution, the first radiating arm extends a certain distance on one side to form a first extension; the second radiating arm extends a certain distance on one side to form a second extension.

[0011] More preferably, the first extension and the second extension are symmetrical.

[0012] More preferably, the first radiating arm and the second radiating arm can excite resonant frequencies of 698-960MHz and 1710-5000MHz, respectively, thereby exciting resonant frequencies in the low-frequency, mid-frequency and high-frequency bands of 5G.

[0013] The first, second, third, and fourth slits can excite resonant frequencies of 1710-2690MHz, which can broaden the operating bandwidth and improve in-band matching.

[0014] More preferably, the first radiating arm has a first side, the second radiating arm has a third side, the first side and the third side are located on the same straight line, the first gap is formed on the first side, the third gap is formed on the third side, the first extension extends from the first side, and the second extension extends from the third side.

[0015] More preferably, the size of the substrate is no greater than 130mm × 50mm.

[0016] Preferably, the first radiating arm and the second radiating arm can excite a resonant frequency of 1710-5000MHz, thereby exciting the resonant frequency of the 5G mid-frequency and high-frequency bands.

[0017] The first, second, third, and fourth slits can excite resonant frequencies of 1710-2690MHz, which can broaden the operating bandwidth and improve in-band matching.

[0018] Preferably, in the above technical solution, the size of the substrate is no greater than 95mm × 30mm.

[0019] Preferably, in the above technical solution, the first radiating arm and the second radiating arm are dipoles. The use of dipoles in the first radiating arm and the second radiating arm has better omnidirectionality and higher radiation efficiency.

[0020] Preferably, in the above technical solution, the first radiating arm has adjacent first and second sides, the first gap is formed on the first side, and the second gap is formed on the second side; the second radiating arm has adjacent third and fourth sides, the first and third sides are on the same straight line, the second and fourth sides are opposite each other, the third gap is formed on the third side, and the fourth gap is formed on the fourth side.

[0021] To achieve the above objectives, another technical solution adopted by this utility model is:

[0022] An FPC vehicle-mounted antenna includes multiple antenna bodies of the FPC vehicle-mounted antenna, which are arranged in a straight line.

[0023] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0024] Compared to traditional antennas that can only be arranged in a two-dimensional plane, the FPC substrate of this invention has the advantages of small size, light weight, and thinness compared to ordinary PCB substrates. It can not only reduce the size and weight of the antenna, but also improve flexibility and enhance three-dimensional assembly in a limited space. The antenna can be arranged according to the mechanical structure of automotive parts and can be arbitrarily bent and arranged in three-dimensional space, thus expanding the space available for arrangement. The overall structure of the antenna is simple, easy to process, and environmentally friendly. Attached Figure Description

[0025] Appendix Figure 1 This is a schematic diagram of the structure of Embodiment 1;

[0026] Appendix Figure 2 The return loss diagram is shown in Example 1.

[0027] Appendix Figure 3 This is a schematic diagram of the structure of Example 2;

[0028] Appendix Figure 4 The return loss diagram is shown in Example 2.

[0029] Appendix Figure 5 The radiation efficiency diagrams for Examples 1 and 2 are shown.

[0030] Appendix Figure 6 This is a schematic diagram showing the distribution of the antenna body in Example 3;

[0031] Appendix Figure 7 This is an isolation diagram between full-band antennas 40 and 41 in Example 3;

[0032] Appendix Figure 8 This is an isolation diagram between the full-band antenna 40 and the mid-to-high frequency band antenna 42 in Embodiment 3;

[0033] Appendix Figure 9 This is an isolation diagram between the full-band antenna 40 and the mid-to-high frequency band antenna 43 in Embodiment 3;

[0034] Appendix Figure 10 This is an isolation diagram between mid-to-high frequency band antennas 42 and 43 in Example 3.

[0035] In the attached diagrams above:

[0036] 1. Substrate;

[0037] 2. First radiating arm; 20. First side; 200. First gap; 201. First extension; 21. Second side; 210. Second gap; 211. Feed point;

[0038] 3. Second radiating arm; 30. Third side; 300. Third gap; 301. Second extension; 31. Fourth side; 310. Fourth gap; 311. Grounding point;

[0039] 40, 41, Full-band antenna; 42, 43, Mid-to-high frequency band antenna. Detailed Implementation

[0040] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0041] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] Example 1:

[0043] like Figure 1 The image shows an FPC-mounted 5G mid-to-high frequency band antenna for vehicles, comprising an antenna body, which includes a substrate 1, a first radiating arm 2, and a second radiating arm 3. Specifically:

[0044] Substrate 1 is a flexible printed circuit board (FPC) with excellent thermal stability, chemical stability, and mechanical properties. The dimensions of substrate 1 are 90mm × 22mm.

[0045] A first radiating arm 2 is formed on a substrate 1. A first slit 200 and a second slit 210 are formed on the first radiating arm 2. A feed point 211 is formed on the first radiating arm 2.

[0046] In this embodiment: the first radiating arm 2 has an adjacent first side 20 and a second side 21. A first gap 200 is formed on the first side 20. The first gap 200 in the figure is in the shape of a hook. A second gap 210 is formed on the second side 21. The second gap 210 in the figure is in the shape of a line. A feed point 211 is formed on the second side 21.

[0047] The second radiating arm 3 is formed on the substrate 1. The second radiating arm 3 has a third slit 300 and a fourth slit 310. A grounding point 311 is formed on the second radiating arm 3. The first slit 200 is symmetrical to the third slit 300, and the second slit 210 is symmetrical to the fourth slit 310.

[0048] In this embodiment: the second radiating arm 3 has an adjacent third side 30 and a fourth side 31, the first side 20 and the third side 30 are located on the same straight line, the second side 21 and the fourth side 31 are opposite each other, the third gap 300 is opened on the third side 30, and the third gap 300 is also in the shape of a hook, the fourth gap 310 is opened on the fourth side 31, and the fourth gap 310 is also in the shape of a line; the grounding point 311 is formed on the fourth side 31.

[0049] The first radiating arm 2 and the second radiating arm 3 are dipoles, which have high antenna radiation efficiency. The first radiating arm 2 and the second radiating arm 3 of the dipole can excite resonant frequencies of 1710-5000MHz, thereby exciting resonant frequencies in the 5G intermediate frequency and high frequency bands. The first slot 200, the second slot 210, the third slot 300, and the fourth slot 310 can excite resonant frequencies of 1710-2690MHz, which can broaden the operating bandwidth and improve in-band matching.

[0050] like Figure 2 As shown, the return loss of the 5G mid-to-high frequency band antenna in this embodiment can reach -10dB in the range of 1710-2690MHz and 3300-5000MHz.

[0051] The antenna in this embodiment uses a PI substrate, printed with silver paste, and surface treated with carbon paste. Chemical gold plating is employed to prevent pad oxidation. Additive manufacturing is used, greatly simplifying the process, reducing carbon emissions, and meeting green environmental protection requirements. Due to its lightweight, thinness, and bendability, it can be installed in a wider range of locations than traditional vehicle antennas, such as on the rear spoiler, front and rear bumpers, rearview mirrors, interior rearview mirrors, roof, and side windows.

[0052] Example 2:

[0053] like Figure 3 The FPC vehicle-mounted 5G full-band antenna shown includes an antenna body, which comprises a substrate 1, a first radiating arm 2, and a second radiating arm 3. Specifically:

[0054] Substrate 1 is a flexible printed circuit board (FPC) with excellent thermal stability, chemical stability, and mechanical properties. The dimensions of substrate 1 are 124mm × 45mm.

[0055] A first radiating arm 2 is formed on a substrate 1. A first slit 200 and a second slit 210 are provided on the first radiating arm 2. One side of the first radiating arm 2 extends a certain distance and forms a first extension 201. A feed point 211 is formed on the first radiating arm 2.

[0056] In this embodiment: the first radiating arm 2 has an adjacent first side 20 and a second side 21. A first gap 200 is formed on the first side 20. The first gap 200 in the figure is in the shape of a hook. A second gap 210 is formed on the second side 21. The second gap 210 in the figure is in the shape of a line. A first extension 201 extends from the first side 20. A feed point 211 is formed on the second side 21.

[0057] The second radiating arm 3 is formed on the substrate 1. The second radiating arm 3 has a third slit 300 and a fourth slit 310. One side of the second radiating arm 3 extends a certain distance and forms a second extension 301. A grounding point 311 is formed on the second radiating arm 3. The first slit 200 and the third slit 300 are symmetrical, the second slit 210 and the fourth slit 310 are symmetrical, and the first extension 201 and the second extension 301 are symmetrical.

[0058] In this embodiment: the second radiating arm 3 has an adjacent third side 30 and a fourth side 31, the first side 20 and the third side 30 are located on the same straight line, the second side 21 and the fourth side 31 are opposite each other, the third gap 300 is opened on the third side 30, and the third gap 300 is also in the shape of a hook, the fourth gap 310 is opened on the fourth side 31, and the fourth gap 310 is also in the shape of a line; the second extension 301 extends from the third side 30; the grounding point 311 is formed on the fourth side 31.

[0059] The first radiating arm 2 and the second radiating arm 3 are dipoles, resulting in high antenna radiation efficiency. The first extension 201 and the second extension 301 optimize the resonant frequency towards lower frequencies, making the low-frequency resonant frequency 698-960MHz. That is, the first radiating arm 2 and the second radiating arm 3 can excite resonant frequencies of 698-960MHz and 1710-5000MHz, thereby exciting resonant frequencies in the low-frequency, mid-frequency, and high-frequency bands of 5G. The first slot 200, the second slot 210, the third slot 300, and the fourth slot 310 can excite resonant frequencies of 1710-2690MHz, which can broaden the operating bandwidth and improve in-band matching.

[0060] like Figure 4 As shown, the return loss of the 5G full-band antenna in this embodiment can reach -6dB in the 698-960MHz range; and -10dB in the 1710-2690MHz and 3300-5000MHz ranges.

[0061] like Figure 5As shown, in this embodiment, the radiation efficiency can reach over 60% across the entire frequency band, except for a few frequency points.

[0062] The antenna in this embodiment uses a PI substrate, printed with silver paste, and surface treated with carbon paste. Chemical gold plating is employed to prevent pad oxidation. Additive manufacturing is used, greatly simplifying the process, reducing carbon emissions, and meeting green environmental protection requirements. Due to its lightweight, thinness, and bendability, it can be installed in a wider range of locations than traditional vehicle antennas, such as on the rear spoiler, front and rear bumpers, rearview mirrors, interior rearview mirrors, roof, and side windows.

[0063] Example 3:

[0064] An FPC vehicle-mounted antenna includes multiple antenna bodies arranged in a line. The number of antenna bodies is typically 2-4.

[0065] like Figure 6 As shown: This embodiment takes four antenna bodies as an example, using two mid-to-high frequency band antennas from Embodiment 1 and two full-band antennas from Embodiment 2, and arranges them in a line array with full-band antenna 40, mid-to-high frequency band antenna 42, mid-to-high frequency band antenna 43 and full-band antenna 41, with a spacing of 110mm between adjacent antenna bodies.

[0066] like Figure 7-10 As shown, using multiple antenna elements to form an array can improve antenna gain and directivity. The isolation between antenna elements can reach -25dB in the 698-960MHz frequency band and -35dB in the 1710-2690MHz and 3300-5000MHz frequency bands.

[0067] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An FPC vehicle-mounted antenna, comprising an antenna body, characterized in that: The antenna body includes: The substrate is a flexible circuit board. A first radiating arm is formed on the substrate, and a first slit and a second slit are formed on the first radiating arm. A feed point is formed on the first radiating arm. The second radiating arm is formed on the substrate. The second radiating arm has a third slit and a fourth slit. The first slit is symmetrical to the third slit, and the second slit is symmetrical to the fourth slit. A grounding point is formed on the second radiating arm.

2. The FPC vehicle-mounted antenna according to claim 1, characterized in that: The first radiating arm extends a certain distance on one side to form a first extension; the second radiating arm extends a certain distance on one side to form a second extension. The first extension and the second extension are symmetrical.

3. The FPC vehicle-mounted antenna according to claim 2, characterized in that: The first and second radiating arms can excite resonant frequencies of 698-960MHz and 1710-5000MHz, respectively. The first, second, third, and fourth slits can generate resonant frequencies of 1710-2690MHz.

4. The FPC vehicle-mounted antenna according to claim 2, characterized in that: The first radiating arm has a first side, the second radiating arm has a third side, the first side and the third side are located on the same straight line, the first gap is formed on the first side, the third gap is formed on the third side, the first extension extends from the first side, and the second extension extends from the third side.

5. The FPC vehicle-mounted antenna according to claim 2, characterized in that: The size of the substrate is no greater than 130mm × 50mm.

6. The FPC vehicle-mounted antenna according to claim 1, characterized in that: The first and second radiating arms can excite resonant frequencies of 1710-5000MHz; The first, second, third, and fourth slits can generate resonant frequencies of 1710-2690MHz.

7. The FPC vehicle-mounted antenna according to claim 1, characterized in that: The size of the substrate is no greater than 95mm × 30mm.

8. The FPC vehicle-mounted antenna according to claim 1, characterized in that: The first and second radiating arms are dipoles.

9. The FPC vehicle-mounted antenna according to claim 1, characterized in that: The first radiating arm has adjacent first and second sides, the first gap is formed on the first side, and the second gap is formed on the second side; the second radiating arm has adjacent third and fourth sides, the first and third sides are on the same straight line, the second and fourth sides are opposite each other, the third gap is formed on the third side, and the fourth gap is formed on the fourth side.

10. An FPC vehicle-mounted antenna, characterized in that: It includes an antenna body in the FPC vehicle-mounted antenna according to any one of claims 1 to 9, wherein the plurality of antenna bodies are arranged in a line.

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