Multi-band antenna

Abstract

The utility model provides a multi-band antenna, which comprises a PCB (printed circuit board), a copper stud and a radio frequency connecting assembly which are connected in sequence, an antenna wiring area is arranged on the PCB, an antenna resonance wiring branch, an impedance adjusting branch, an antenna feed point and a reference ground plane are arranged in the antenna wiring area, an ejector pin is vertically arranged on the reference ground plane, and the radio frequency connecting assembly is arranged on the copper stud. The ejector pin enables the ground plane of an antenna wiring area to be fully contacted with the copper stud and to be well grounded, the length of the antenna reference ground is effectively prolonged, the low-frequency band bandwidth and efficiency of the multi-frequency band antenna are optimized, a low-frequency branch, an intermediate-frequency branch and a coupling branch extending from the reference ground plane to the intermediate-frequency branch are arranged, low-frequency, intermediate-frequency and high-level multi-frequency band resonance modes are achieved, and the multi-frequency band resonance mode is optimized. The impedance adjustment branch realizes a good matching effect in different resonance modes, and the copper stud can be connected with a metal surface of equipment to form good grounding, so that the gain effect of the multi-band antenna is improved, the anti-interference capability is enhanced, the working performance of the multi-band antenna is ensured, and the multi-band antenna is adaptive to various outdoor application scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless communications, and in particular to a multi-band antenna. Background Art

[0002] At present, wireless communication technology is developing rapidly. Antennas, as devices for transmitting and receiving wireless signals, play a very important role. For the complex environments faced by external antennas, it is necessary to ensure that the communication quality is not affected. Therefore, they need to have characteristics such as high efficiency, high gain, and device adaptation and integration. In addition, the market has also put forward requirements for the integration and concealment of external antennas. Highly integrated antennas can achieve more functions in a limited size. Antennas with good concealment can avoid being too conspicuous in places with large flow of people and being considered to be moved or removed, resulting in communication failure. However, there are many types of external antennas on the market, including magnetic, suction cup, or rod-shaped structures. However, some external antennas placed in outdoor devices such as smart charging cabinets or vending machines are easily interfered with by the communication signals in the antenna environment. In addition, most external antennas only support a single communication standard, which limits the application scenarios of external antennas and affects the user experience of external antennas. Utility Model Content

[0003] In view of this, the present invention provides an antenna that has strong anti-interference performance, is easy to install, and supports multiple frequency bands, in order to solve the above-mentioned technical problems.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] The utility model provides a multi-band antenna, which includes a PCB board, a copper stud, and a radio frequency connection component connected in sequence. The PCB board includes an antenna routing area, the antenna routing area includes an antenna resonant routing branch, an impedance adjustment branch, a reference ground plane, and an antenna feed point. The antenna resonant routing branch includes a first antenna branch arranged on the circumference of the PCB board, a second antenna branch connected to the first antenna branch, and a third antenna branch located on the reference ground plane and extending toward the edge of the PCB board. The reference ground plane is located at the center of the antenna routing area. The antenna resonant routing branch and the reference ground plane are both connected to the impedance adjustment branch. The antenna feed point includes a feeding point arranged on the second antenna branch and a feeding point adjacent to the third antenna branch and arranged opposite to the feeding point. The PCB board is also provided with at least one ejector pin perpendicular to the reference ground plane, and the ejector pin is connected to the copper stud.

[0006] As a preferred embodiment of the above technical solution, the first antenna branch and the second antenna branch are connected to form a non-closed circular ring, and the third antenna branch is arranged along the opening of the non-closed circular ring.

[0007] As a preferred embodiment of the above technical solution, the first antenna branch is a low-frequency antenna branch, the second antenna branch is an intermediate-frequency antenna branch, and the third antenna branch is a coupling branch of the intermediate-frequency antenna branch.

[0008] As a preferred embodiment of the above technical solution, the impedance adjustment branch is U-shaped, and the impedance adjustment branch is used to adjust the length from the reference ground plane to the antenna resonant wiring branch.

[0009] As a preferred embodiment of the above technical solution, the multi-band antenna also includes an antenna cover and a base plate, the ejector pin is arranged on the upper surface of the base plate, the copper stud is arranged on the lower surface of the base plate, and the antenna cover and the base plate are adapted to accommodate the PCB board.

[0010] As a preferred embodiment of the above technical solution, the upper surface of the base plate is provided with a sealing protrusion installed corresponding to the antenna cover.

[0011] As a preferred embodiment of the above technical solution, a waterproof ring is attached to the lower surface of the base plate, and the waterproof ring is arranged on the periphery of the copper stud.

[0012] As a preferred embodiment of the above technical solution, there are two ejector pins, which are located on the PCB board on both sides of the copper stud.

[0013] As a preferred embodiment of the above technical solution, the RF connection component includes a RF cable and a RF connector, one end of the RF cable passes through the copper stud and is connected to the PCB board, and the other end of the RF cable is provided with the RF connector.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] By providing a PCB board, copper studs, and RF connection components connected in sequence, an antenna routing area is set on the PCB board. The antenna routing area is provided with an antenna resonant routing branch, an impedance adjustment branch, an antenna feed point, and a reference ground plane. A pin is vertically arranged on the reference ground plane. The pin fully contacts the ground plane in the antenna routing area with the copper stud for good grounding, effectively extending the length of the antenna reference ground, thereby optimizing the low-frequency bandwidth and efficiency of the multi-band antenna. By providing a low-frequency branch, an intermediate-frequency branch, and a coupling branch extending from the reference ground plane to the intermediate-frequency branch, low, intermediate, and high-frequency multi-band resonant modes are achieved. The impedance adjustment branch achieves good matching in different resonant modes, achieving a wide frequency band copper cladding in a low-profile and small space. The copper stud is reliably installed and fixed, and the copper stud can be connected to the metal surface of the device to form a good ground, further increasing the antenna reference ground plane, thereby improving the gain effect and radiation efficiency of the multi-band antenna. At the same time, the relative anti-interference capability is enhanced, ensuring the working performance of the multi-band antenna and adapting it to various outdoor application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the multi-band antenna proposed in this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the antenna routing area proposed in the present utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the antenna cover proposed in the utility model;

[0019] Figure 4 This is a structural schematic diagram of the base plate proposed in the present utility model.

[0020] The main component symbols are described as follows:

[0021] 10-PCB board; 11-antenna routing area; 12-reference ground plane; 13-thrust pin; 20-copper stud; 30-RF connection component; 31-first antenna branch; 32-second antenna branch; 33-feeding point; 34-feeding point; 35-third antenna branch; 36-impedance adjustment branch; 40-radome; 50-bottom plate; 51-sealing protrusion; 60-RF cable; 61-RF connector. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] See Figure 1 、 Figure 2 and Figure 3 The utility model provides a multi-band antenna, the multi-band antenna comprising a PCB board 10, a copper stud 20 and a radio frequency connection component 30 connected in sequence, the PCB board 10 comprising an antenna trace area 11, the antenna trace area 11 comprising an antenna resonant trace branch, an impedance adjustment branch 36, a reference ground plane 12 and an antenna feed point, the antenna resonant trace branch comprising a first antenna branch 31 arranged on the circumference of the PCB board 10, a second antenna branch 32 connected to the first antenna branch 31, and a second antenna branch 32 located on the reference ground plane 12 toward the PCB board 10. The third antenna branch 35 extends from the edge of the B board 10, the reference ground plane 12 is located at the center of the antenna routing area 11, the antenna resonant routing branch and the reference ground plane 12 are both connected to the impedance adjustment branch 36, and the antenna feeding point includes a feeding point 33 arranged on the second antenna branch 32, and a feeding point 34 adjacent to the third antenna branch 35 and arranged opposite to the feeding point 33. The PCB board 10 is also provided with at least one ejector pin 13 perpendicular to the reference ground plane 12, and the ejector pin 13 is connected to the copper stud 20.

[0025] In this embodiment, the first antenna branch 31 and the second antenna branch 32 are connected in a non-enclosed circular ring shape, and the third antenna branch 35 is arranged along the opening of the non-enclosed circular ring. The first antenna branch 31 is the antenna low-frequency branch, the second antenna branch 32 is the antenna intermediate-frequency branch, and the third antenna branch 35 is a coupling branch of the antenna intermediate-frequency branch. The impedance adjustment branch 36 is U-shaped and is used to adjust the length from the reference ground plane 12 to the antenna resonant trace branch. The multi-band antenna also includes an antenna cover 40 and a base plate 50. The ejector pin 13 is located on the upper surface of the base plate 50, and the copper stud 20 is disposed on the lower surface of the base plate 50. The antenna cover 40 and the base plate 50 are adapted to accommodate the PCB board 10. The upper surface of the base plate 50 is provided with a sealing protrusion 51 installed corresponding to the antenna cover 40, and the lower surface of the base plate 50 is affixed with a waterproof ring (not shown), which is arranged on the periphery of the copper stud 20. There are two ejector pins 13, and the two ejector pins 13 are located on the PCB board 10 on both sides of the copper stud 20. The RF connection component 30 includes an RF cable 60 and an RF connector 61. One end of the RF cable 60 passes through the copper stud 20 and is connected to the PCB board 10, and the other end of the RF cable 60 is provided with the RF connector 61.

[0026] As described above, the first antenna branch 31 and the second antenna branch 32 are connected in a non-closed circular ring shape, and the third antenna branch 35 is set along the opening of the non-closed circular ring, which can maximize the use of the space on the PCB board 10, so that the length of the antenna resonant trace branch can be maximized in a relatively small space. The first antenna branch 31 is the low-frequency branch of the antenna, which is longer and forms a low-frequency resonance of the antenna; the second antenna branch 32 is the intermediate-frequency branch of the antenna, which forms an intermediate-frequency resonance of the antenna; the third antenna branch 35 is a coupling branch of the intermediate-frequency branch of the antenna, forming a high-frequency resonance, which is superimposed with the resonance of the second antenna branch 35 to expand the medium and high frequency bandwidth. The impedance adjustment branch 36 is U-shaped, which is convenient for adjusting the length in a limited space. It mainly adjusts the antenna input impedance by referring to the length of the U-shaped line from the ground plane 12 to the antenna resonant trace branch.

[0027] It should be noted that, for example, the first antenna branch 31 can cover the low-frequency part. This embodiment can achieve good coverage of the 791-960 MHz frequency band. The second antenna branch 32 can cover the mid-frequency part. When superimposed with the third antenna branch 35, it can achieve good coverage of the 1710-5000 MHz frequency band. Since the impedance of the antenna is easily affected by the antenna working environment, the antenna is very prone to impedance mismatch, which will cause large fluctuations in the antenna signal quality. It is necessary to adjust the impedance matching of the antenna. The length of the impedance adjustment branch 36 can effectively control the impedance of the RF signal trace to achieve a relatively stable resonance effect in different frequency bands. The PCB board 10 is circular, and the traces corresponding to the first antenna branch 31 and the second antenna branch 32 are located on the circumference of the PCB board 10. The antenna trace area 11 is patched on the PCB board 10. The feeding point 33 and the feeding point 34 are welded on the antenna trace area 11. The antenna trace area 11 includes an outer ring and an inner circle, which can achieve signal radiation and coupling in multiple frequency bands. The third antenna branch 35 is at a certain distance from one end of the first antenna branch 31 and one end of the second antenna branch 32 , respectively, to ensure antenna radiation performance.

[0028] Among them, the copper stud 20 is used to fix the PCB board 10, and the antenna wiring area 11 and the copper stud 20 can be connected by conductive foam, which effectively extends the length of the antenna wiring area 11, so that the low-frequency band bandwidth of the multi-band antenna is optimized, thereby optimizing the matching of the multi-band antenna working in the low-frequency band, and ensuring that the multi-band antenna has a higher radiation efficiency when working in the low-frequency band. In addition, the copper stud 20 can be adapted to the metal surface of the cabinet of an intelligent charging and battery replacement cabinet or a vending machine, etc. The metal surface of the cabinet is screwed to the copper stud 20 through a nut (not shown), so that the copper stud 20 is easy to install and connected to the cabinet to form a larger reference ground. The ejector pin 13 connects the ground plane of the antenna wiring area 11 to the copper stud 20 to form a large reference ground, thereby improving the working reliability of the antenna.

[0029] Among them, see Figure 3 and Figure 4 , the antenna cover 40 is sealed and docked with the base plate 50 through the sealing protrusion 51, and a waterproof ring is coated on the lower surface of the base plate 50. The RF connector 61 may include but is not limited to an SMA connector, and there is no limitation on the model of the RF connector 61. The RF cable 60 may include but is not limited to an RF coaxial cable, and there is no limitation on the model of the RF cable 60. The antenna cover 40 may include but is not limited to ABS material, and there is no limitation on the material of the antenna cover 40. In the multi-band antenna structure provided in the above embodiment, the antenna cover 40 is made of ABS material, which is not only strong in strength, good in toughness, and easy to process and form, but also resistant to high temperatures, and the maximum operating temperature can reach the requirement of 75°C.

[0030] Specifically, the modulated RF signal is input into the back-end communication device, and the back-end communication device is communicated with the RF connector 61 at the end of the RF cable 60. The signal is input into the RF cable 60 through the RF connector 61, and is transmitted through the RF cable 60 to the PCB board 10 at the other end of the RF cable 60. After passing through the antenna routing area 11, the guided wave in the RF cable 60 is converted into an electromagnetic wave and radiated into space. High-quality RF signals can be received within the antenna radiation range.

[0031] It should be understood that, by providing a PCB board 10, a copper stud 20 and a RF connection component 30 connected in sequence, an antenna trace area 11 is provided on the PCB board 10, an antenna resonant trace branch, an impedance adjustment branch 36 and an antenna feed point and a reference ground plane 12 are provided in the antenna trace area 11, and a thimble 13 is vertically provided on the reference ground plane 12. The thimble 13 is used to fully contact the ground plane of the antenna trace area 11 with the copper stud 20 for good grounding, thereby effectively extending the length of the antenna reference ground, thereby optimizing the low-frequency bandwidth and efficiency of the multi-band antenna, and by providing a low-frequency branch, an intermediate-frequency branch and a reference ground plane. The reference ground plane 12 extends to the coupling branch of the intermediate frequency branch to achieve low, medium and high multi-band resonant modes. The impedance adjustment branch 36 can achieve good matching effects under different resonant modes, and realize a wider frequency band copper cladding in a low profile and small space. The copper stud 20 is reliably installed and fixed. The copper stud 20 can be connected to the metal surface of the equipment to form a good grounding, further increasing the antenna reference ground plane 12, thereby improving the gain effect of the multi-band antenna, improving the antenna radiation efficiency, and at the same time enhancing the relative anti-interference ability, ensuring the working performance of the multi-band antenna, and adapting to a variety of outdoor application scenarios.

[0032] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-band antenna, characterized in that: The multi-band antenna includes a PCB board, a copper stud and a radio frequency connection component connected in sequence. The PCB board includes an antenna routing area, which includes an antenna resonant routing branch, an impedance adjustment branch, a reference ground plane and an antenna feed point. The antenna resonant routing branch includes a first antenna branch arranged on the circumference of the PCB board, a second antenna branch connected to the first antenna branch, and a third antenna branch located on the reference ground plane and extending toward the edge of the PCB board. The reference ground plane is located at the center of the antenna routing area. The antenna resonant routing branch and the reference ground plane are both connected to the impedance adjustment branch. The antenna feed point includes a feeding point arranged on the second antenna branch and a feeding point adjacent to the third antenna branch and arranged opposite to the feeding point. The PCB board is also provided with at least one ejector pin perpendicular to the reference ground plane, and the ejector pin is connected to the copper stud.

2. The multi-band antenna according to claim 1, wherein: The first antenna branch and the second antenna branch are connected to form a non-closed circular ring, and the third antenna branch is arranged along an opening of the non-closed circular ring.

3. The multi-band antenna according to claim 2, wherein: The first antenna branch is a low-frequency antenna branch, the second antenna branch is an intermediate-frequency antenna branch, and the third antenna branch is a coupling branch of the intermediate-frequency antenna branch.

4. The multi-band antenna according to claim 1, wherein: The impedance adjustment branch is U-shaped and is used to adjust the length from the reference ground plane to the antenna resonant wiring branch.

5. The multi-band antenna according to claim 1, wherein: The multi-band antenna further includes an antenna cover and a base plate. The ejector pin is located on the upper surface of the base plate, and the copper stud is arranged on the lower surface of the base plate. The antenna cover and the base plate are adapted to accommodate the PCB board.

6. The multi-band antenna according to claim 5, wherein: The upper surface of the base plate is provided with a sealing protrusion which is installed corresponding to the antenna cover.

7. The multi-band antenna according to claim 6, wherein: A waterproof ring is attached to the lower surface of the bottom plate, and the waterproof ring is arranged on the periphery of the copper stud.

8. The multi-band antenna according to claim 1, wherein: There are two ejector pins, which are located on the PCB board at both sides of the copper stud.

9. The multi-band antenna according to claim 1, wherein: The RF connection component includes a RF cable and a RF connector. One end of the RF cable passes through the copper stud and is connected to the PCB board, and the other end of the RF cable is provided with the RF connector.

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