Miniaturized GNSS helical antenna

Abstract

The utility model relates to a miniaturized GNSS helical antenna, which comprises an antenna main body, helical arms, a printed circuit board, a medium sleeve and a radio frequency cable, the antenna main body is a cylindrical structure made of a flexible circuit board, one or more groups of helical arms are arranged, each group of helical arms comprises four helical arms, the helical arms are wound on the outer surface of the antenna main body, and the printed circuit board is arranged on the medium sleeve. The printed circuit board and the dielectric sleeve are respectively arranged at two ends of the antenna main body, the printed circuit board is arranged in the antenna main body and seals the antenna main body, a PCBA circuit is arranged on the inner surface of the printed circuit board, and the radio frequency cable is arranged on the printed circuit board. The beneficial effects of the utility model lie in that the circuit is welded in the flexible circuit board, thereby overcoming the defect that the redundant PCBA circuit is exposed, reducing the overall diameter of the antenna and greatly reducing the complexity of the structure on the premise of ensuring the performance of the antenna, and further reducing the size of the handset equipment and improving the portability.

Description

Technical Field

[0001] The utility model belongs to the technical field of antennas, and in particular relates to a miniaturized GNSS helical antenna. Background Art

[0002] The metal layer of the current traditional GNSS helical antenna is printed on the outside of the FPC, and the PCBA circuit needs to protrude a part of the helical antenna for welding. This method will cause the redundant PCBA circuit board to be exposed, and a structure specifically for fixing the PCBA circuit board needs to be designed when installing it on the handheld device. This not only increases the complexity of the overall structural design of the handheld device, but also causes a waste of space in the handheld device shell, increases the size of the handheld device, and reduces the portability of the handheld device.

[0003] The patent with the publication number CN115296008A discloses a multi-constellation satellite navigation antenna based on GNSS flexible composite material, including a spiral antenna body, a spiral arm, a PCB board, a feedback point and a radio frequency circuit, wherein the spiral antenna body is fixedly connected to the top of the PCB board, and the number of the spiral arms is four, and the four spiral arms are spirally fixed to the surface of the spiral antenna body in the same direction. The antenna adopts the RFID antenna printing process, mixes nanosilver in the paste ink, and makes four conductive spiral arms, achieving the same receiving and transmitting functions as the traditional antenna. By improving the materials for making the traditional antenna, it has good compatibility on portable devices, and the structure is easier to process and has higher precision. The new material is selected to reduce the volume and weight of the antenna. However, the antenna does not place the circuit in its soft material, and the printed circuit on the soft material faces outward, resulting in the need for external welding of the circuit and the antenna, which in turn causes the extra circuit on the horizontal plane to occupy a lot of space, resulting in space waste and inability to further miniaturize. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a miniaturized GNSS helical antenna. By welding the circuit inside the flexible circuit board, the defect of excess PCBA circuit exposure is solved. Under the premise of ensuring the antenna performance, the overall diameter of the antenna is reduced, the complexity of the structure is greatly reduced, and the size of the handheld device is reduced and the portability is improved.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A miniaturized GNSS helical antenna comprises an antenna body, a spiral arm, a printed circuit board, a dielectric sleeve and a radio frequency cable. The antenna body is a cylindrical structure made of a flexible circuit board. The spiral arm is provided with one or more groups, each spiral arm group comprises four spiral arms, and the spiral arms are wound around the outer surface of the antenna body. The printed circuit board and the dielectric sleeve are respectively provided at two ends of the antenna body. The printed circuit board is provided in the antenna body and closes the antenna body. The inner surface of the printed circuit board is provided with a PCBA circuit, and the radio frequency cable is provided on the printed circuit board.

[0007] Furthermore, coupling branches are provided between adjacent spiral arms.

[0008] Furthermore, the dielectric sleeve includes a supporting ring and a convex ring, the convex ring is arranged on one side of the supporting ring, and the outer diameter of the convex ring is adapted to the inner diameter of the antenna body.

[0009] Furthermore, the supporting ring is circular or square.

[0010] Furthermore, the PCBA circuit includes a passive feeding network and a radio frequency amplification circuit.

[0011] Furthermore, a shielding cover is provided on the outer surface of the printed circuit board, and the radio frequency cable passes through the shielding cover and is connected to a radio frequency connector.

[0012] Furthermore, the radio frequency connector is one of IPEX, SMA, MCX and MMCX.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model places the circuit inside the antenna body by setting the antenna body and the printed circuit board, and then solves the defect of the redundant PCBA circuit being exposed by welding the circuit inside the flexible circuit board. Under the premise of ensuring the antenna performance, the overall diameter of the antenna is reduced, the complexity of the structure is greatly reduced, and the size of the handheld device is reduced and the portability is improved.

[0015] 2. The utility model adopts the dielectric sleeve to load the dielectric at the same time, and the dielectric sleeve can be installed in an adaptable manner with the antenna body without designing an extra fixing structure, thereby reducing the manufacturing cost and further reducing the structural size. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a front view structural schematic diagram of the utility model;

[0018] Figure 3 This is a structural schematic diagram of a dielectric sleeve in the utility model;

[0019] Figure 4 It is another structural schematic diagram of the dielectric sleeve in the utility model.

[0020] In the figure: 1. Antenna body; 2. Spiral arm; 3. Dielectric sleeve; 31. Support ring; 32. Convex ring; 4. RF cable; 5. Shielding cover; 6. RF connector; 7. Printed circuit board; 8. Coupling branch. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0022] like Figure 1 , 2 As shown, a miniaturized GNSS helical antenna comprises an antenna body 1, a helical arm 2, a printed circuit board 7, a dielectric sleeve and a radio frequency cable 4. The antenna body 1 is a cylindrical structure made of a flexible circuit board; the helical arm 2 is provided with one or more groups, each group of the helical arm 2 comprises four helical arms 2, the helical arms 2 are wound around the outer surface of the antenna body 1, the printed circuit board 7 and the dielectric sleeve are respectively provided at both ends of the antenna body 1, the printed circuit board 7 is provided in the antenna body 1 and closes the antenna body 1, the edge of the printed circuit board 7 is welded to the antenna body 1, and the printed circuit board 7 closes the antenna body 1, the inner surface of the printed circuit board 7 is provided with a PCBA circuit, the PCBA circuit comprises a passive feeding network and a radio frequency amplification circuit, and the radio frequency cable 4 is provided on the printed circuit board 7.

[0023] Based on the above antenna structure, the spiral arm 2 is wound on the antenna body 1 made of a flexible circuit board, and the printed circuit board 7 is placed in the antenna body 1, and then the PCBA circuit is wrapped in the spiral antenna. Finally, the defect of excess PCBA circuit exposure is solved by welding the circuit inside the flexible circuit board, and the overall size of the antenna is reduced while ensuring the antenna performance.

[0024] Preferably, in this embodiment, one set of spiral arms 2 can form a single-band GNSS antenna, or two sets of spiral arms 2 can form a dual-band GNSS antenna. The dual-band GNSS antenna has stronger positioning performance and stability than the single-band GNSS antenna. The metal layer of the spiral arm 2 is directly printed on the flexible circuit board, and coupling branches 8 are added between adjacent spiral arms 2 to increase the coupling amount and reduce the equivalent size.

[0025] like Figure 3 , 4As shown, the dielectric sleeve includes a support ring 31 and a convex ring 32. The convex ring 32 is arranged on one side of the support ring 31. The support ring 31 and the convex ring 32 are preferably integrally formed and connected. The outer diameter of the convex ring 32 is adapted to the inner diameter of the antenna body 1, so that the dielectric sleeve can be sleeved with the antenna body 1 through the convex ring 32, and the two can be tightly fitted, so that the dielectric sleeve 3 and the printed circuit board 7 respectively close the two ends of the antenna body 1, and the dielectric loading is realized through the dielectric sleeve 3. Preferably, the support ring 31 can be Figure 3 The circular or Figure 4 The square shape shown in the figure, while the convex ring 32 is adapted to the antenna body 1, is assembled with the housing of the handheld device through the support ring 31, without the need to design an additional fixing structure, thereby reducing the manufacturing cost and further reducing the structural size.

[0026] like Figure 1 As shown, a shielding cover 5 is fixed on the outer surface of the printed circuit board 7, and the RF cable 4 passes through the shielding cover 5 and is connected to a RF connector 6. The RF connector 6 can be one of IPEX, SMA, MCX and MMCX.

[0027] Finally, although the above description has shown and described the embodiments of the present invention, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A miniaturized GNSS helical antenna, characterized in that: The invention comprises an antenna body (1), a spiral arm (2), a printed circuit board (7), a dielectric sleeve (3) and a radio frequency cable (4); the antenna body (1) is a cylindrical structure made of a flexible circuit board; the spiral arm (2) is provided with one or more groups, each spiral arm group comprises four spiral arms (2); the spiral arms (2) are wound around the outer surface of the antenna body (1); the printed circuit board (7) and the dielectric sleeve (3) are respectively provided at two ends of the antenna body (1); the printed circuit board (7) is provided in the antenna body (1) and closes the antenna body (1); the inner surface of the printed circuit board (7) is provided with a PCBA circuit; and the radio frequency cable (4) is provided on the printed circuit board (7).

2. The miniaturized GNSS helical antenna according to claim 1, characterized in that: Coupling branches (8) are arranged between adjacent spiral arms.

3. The miniaturized GNSS helical antenna according to claim 1, characterized in that: The dielectric sleeve (3) comprises a supporting ring (31) and a convex ring (32); the convex ring (32) is arranged on one side of the supporting ring (31); and the outer diameter of the convex ring (32) is adapted to the inner diameter of the antenna body (1).

4. The miniaturized GNSS helical antenna according to claim 3, characterized in that: The supporting ring (31) is circular or square.

5. The miniaturized GNSS helical antenna according to claim 1, characterized in that: The PCBA circuit includes a passive feeding network and a radio frequency amplification circuit.

6. The miniaturized GNSS helical antenna according to claim 1, characterized in that: A shielding cover (5) is provided on the outer surface of the printed circuit board (7), and the radio frequency cable (4) passes through the shielding cover (5) and is connected to a radio frequency connector (6).

7. The miniaturized GNSS helical antenna according to claim 6, characterized in that: The radio frequency connector (6) is one of IPEX, SMA, MCX and MMCX.

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