A circularly polarized antenna with a fence

Abstract

The utility model discloses a kind of circular polarized antennas with fence, including upper layer antenna radiation surface, upper layer dielectric layer, lower layer antenna radiation surface, lower layer dielectric layer, circuit board, metal fence, upper layer feed needle and lower layer feed needle, the upper layer antenna radiation surface is closely attached to the upper layer dielectric layer first side and the lower layer antenna radiation surface is closely attached to the first side of the lower layer dielectric layer, the second side of the upper layer dielectric layer is located at the side of the lower layer antenna radiation surface away from the lower layer dielectric layer;The metal fence is fixedly installed on the first side of the circuit board and the metal fence surrounds the upper layer antenna radiation surface, the upper layer dielectric layer, the lower layer antenna radiation surface and the lower layer dielectric layer.The circular polarized antenna with fence disclosed in the utility model improves the interference caused by antenna gain and beam width in complex electromagnetic environment.

Description

Technical Field

[0001] This utility model belongs to the field of antenna technology, specifically relating to a circularly polarized antenna with a fence. Background Technology

[0002] With the completion of the BeiDou-3 system, BeiDou high-precision positioning and short message communication applications are becoming increasingly widespread. In antenna applications, dual-frequency, low-axis-ratio circularly polarized antennas are a common choice for high-precision positioning applications. The application scenarios for dual-frequency, dual-fed circularly polarized antennas are also increasing. When antennas are located in compact structures with complex surrounding electromagnetic environments, their gain and beamwidth are often significantly affected. Utility Model Content

[0003] The main objective of this invention is to provide a circularly polarized antenna with a fence to improve the interference to antenna gain and beamwidth in complex electromagnetic environments.

[0004] To achieve the above objectives, this utility model provides a circularly polarized antenna with a fence, comprising an upper antenna radiating surface, an upper dielectric layer, a lower antenna radiating surface, a lower dielectric layer, a circuit board, a metal fence, an upper feed pin, and a lower feed pin, wherein:

[0005] The upper antenna radiating surface is in close contact with the first side of the upper dielectric layer, and the lower antenna radiating surfaces are all in close contact with the first side of the lower dielectric layer. The second side of the upper dielectric layer is located on the side of the lower antenna radiating surface away from the lower dielectric layer. The second side of the lower dielectric layer is fixedly mounted on the first side of the circuit board (the large area of ​​copper on the first side surface of the circuit board serves as a ground layer).

[0006] The metal fence is fixedly installed on the first side of the circuit board and surrounds the upper antenna radiating surface, the upper dielectric layer, the lower antenna radiating surface, and the lower dielectric layer.

[0007] The second side of the circuit board is equipped with a first bridge (3Db), a second bridge (3Db), a matching resistor, a first connector, a second connector, and a third connector. The top end of the upper feed pin is mounted on the upper antenna radiating surface, and the bottom end of the upper feed pin sequentially passes through the upper antenna radiating surface, the upper dielectric layer, the lower antenna radiating surface, the lower dielectric layer, and the circuit board before connecting to the first bridge. The top end of the lower feed pin is mounted on the lower antenna radiating surface, and the bottom end of the lower feed pin sequentially passes through the lower antenna radiating surface, the lower dielectric layer, and the circuit board before connecting to the second bridge.

[0008] One end of the first bridge is connected to the matching resistor and the other end of the first bridge is connected to the first connector; the second bridge is connected to the second connector and the third connector respectively.

[0009] As a further preferred technical solution to the above technical solution, the metal fence includes a first fence, a second fence, a third fence, and a fourth fence respectively installed on the four sides of the circuit board.

[0010] As a further preferred embodiment of the above technical solution, the circuit board is provided with microstrip lines, and the upper feed pin and the lower feed pin are respectively connected to the first bridge and the second bridge through the microstrip lines.

[0011] As a further preferred embodiment of the above technical solution, the upper feed pin does not connect to the lower antenna radiating surface when it penetrates the lower antenna radiating surface.

[0012] As a further preferred embodiment of the above technical solution, the number of both the upper-layer feed pin and the lower-layer feed pin is 2. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of the present invention (front view).

[0014] Figure 2 This is a structural schematic diagram of the present invention (reverse side).

[0015] Figure 3 It is the E-plane radiation pattern of a conventional dual-frequency, dual-fed circularly polarized antenna.

[0016] Figure 4 This is the E-plane radiation pattern of the circularly polarized antenna of this utility model.

[0017] The reference numerals in the attached figures include: 10, upper antenna radiating surface; 20, upper dielectric layer; 30, lower antenna radiating surface; 40, lower dielectric layer; 50, circuit board; 51, first bridge; 52, second bridge; 53, matching resistor; 54, first connector; 55, second connector; 56, third connector; 60, metal fence; 61, first fence; 62, second fence; 63, third fence; 64, fourth fence; 70, upper feed pin. Detailed Implementation

[0018] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0019] This utility model discloses a circularly polarized antenna with a fence. The specific embodiments of the utility model are further described below with reference to preferred embodiments.

[0020] In the embodiments of this utility model, those skilled in the art will note that the copper sheet and the like involved in this utility model can be considered as prior art.

[0021] Preferred embodiment.

[0022] like Figure 1-2 As shown, this utility model discloses a circularly polarized antenna with a fence, including an upper antenna radiating surface 10, an upper dielectric layer 20, a lower antenna radiating surface 30, a lower dielectric layer 40, a circuit board 50, a metal fence 60, an upper feed pin 70, and a lower feed pin (not shown), wherein:

[0023] The upper antenna radiating surface 10 is in close contact with the first side of the upper dielectric layer 20, and the lower antenna radiating surfaces 30 are all in close contact with the first side of the lower dielectric layer 40. The second side of the upper dielectric layer 20 is located on the side of the lower antenna radiating surface 30 away from the lower dielectric layer 40. The second side of the lower dielectric layer 40 is fixedly mounted on the first side of the circuit board 50 (the large area of ​​copper on the first side surface of the circuit board serves as a ground layer).

[0024] The metal fence 60 is fixedly installed on the first side of the circuit board 50 and the metal fence 60 surrounds the upper antenna radiating surface 10, the upper dielectric layer 20, the lower antenna radiating surface 30, and the lower dielectric layer 40.

[0025] The second side of the circuit board 50 is equipped with a first bridge 51 (3Db), a second bridge 52 (3Db), a matching resistor 53, a first connector 54, a second connector 55, and a third connector 56. The top end of the upper feed pin 70 is mounted on the upper antenna radiating surface 10, and the bottom end of the upper feed pin 70 passes through the upper antenna radiating surface 10, the upper dielectric layer 20, the lower antenna radiating surface 30, the lower dielectric layer 40, and the circuit board 50 in sequence before connecting to the first bridge 51. The top end of the lower feed pin is mounted on the lower antenna radiating surface 30, and the bottom end of the lower feed pin passes through the lower antenna radiating surface 30, the lower dielectric layer 40, and the circuit board 50 in sequence before connecting to the second bridge 52.

[0026] One end of the first bridge 51 is connected to the matching resistor 53 and the other end of the first bridge 51 is connected to the first connector 54; the second bridge 52 is connected to the second connector 55 and the third connector 56 respectively.

[0027] Specifically, the metal fence 60 includes a first fence 61, a second fence 62, a third fence 63 and a fourth fence 64 respectively installed on the four sides of the circuit board 50. The metal fence is provided around the circuit board. By adjusting the length and height of the metal fence, the interference caused by the surrounding electromagnetic environment to the antenna can be reduced.

[0028] More specifically, the circuit board 50 is provided with microstrip lines (not shown), and the upper feed pin 70 and the lower feed pin are respectively connected to the first bridge 51 and the second bridge 52 through the microstrip lines.

[0029] Furthermore, the upper feed pin 70 is not connected to the lower antenna radiating surface 30 when it penetrates the lower antenna radiating surface 30.

[0030] Furthermore, the number of the upper feed pin 70 and the lower feed pin is two.

[0031] Preferably, the first connector is used to receive BeiDou short messages;

[0032] For the second connector, the output is a left-hand circularly polarized wave used to transmit BeiDou short messages;

[0033] For the third connector, the output is a right-hand polarized wave used to receive BeiDou and GPS positioning signals.

[0034] The frequency of the antenna can be adjusted by changing the antenna radiation area of ​​the upper and lower layers and the dielectric constant of the upper and lower dielectric layers.

[0035] contrast Figure 3 and Figure 4 As can be seen, in complex electromagnetic environments, the gain and beamwidth of the circularly polarized antenna with a fence of this invention are superior to those of conventional dual-frequency dual-fed circularly polarized antennas.

[0036] It is worth mentioning that the technical features such as copper foil involved in this utility model patent application should be regarded as prior art. The specific structure, working principle and possible control methods and spatial arrangement of these technical features can be adopted by conventional choices in the field and should not be regarded as the inventive point of this utility model patent. This utility model patent will not be further elaborated in detail.

[0037] For those skilled in the art, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A circularly polarized antenna with a fence, characterized in that, This includes an upper antenna radiating surface, an upper dielectric layer, a lower antenna radiating surface, a lower dielectric layer, a circuit board, a metal enclosure, an upper feed pin, and a lower feed pin, wherein: The upper antenna radiating surface is in close contact with the first side of the upper dielectric layer, and the lower antenna radiating surfaces are all in close contact with the first side of the lower dielectric layer. The second side of the upper dielectric layer is located on the side of the lower antenna radiating surface away from the lower dielectric layer. The second side of the lower dielectric layer is fixedly mounted on the first side of the circuit board. The metal fence is fixedly installed on the first side of the circuit board and surrounds the upper antenna radiating surface, the upper dielectric layer, the lower antenna radiating surface, and the lower dielectric layer. The second side of the circuit board is equipped with a first bridge, a second bridge, a matching resistor, a first connector, a second connector, and a third connector. The top end of the upper feed pin is mounted on the upper antenna radiating surface, and the bottom end of the upper feed pin sequentially passes through the upper antenna radiating surface, the upper dielectric layer, the lower antenna radiating surface, the lower dielectric layer, and the circuit board before connecting to the first bridge. The top end of the lower feed pin is mounted on the lower antenna radiating surface, and the bottom end of the lower feed pin sequentially passes through the lower antenna radiating surface, the lower dielectric layer, and the circuit board before connecting to the second bridge. One end of the first bridge is connected to the matching resistor and the other end of the first bridge is connected to the first connector; the second bridge is connected to the second connector and the third connector respectively.

2. A circularly polarized antenna with a fence according to claim 1, characterized in that, The metal fence includes a first fence, a second fence, a third fence, and a fourth fence, which are respectively installed on the four sides of the circuit board.

3. A circularly polarized antenna with a fence according to claim 2, characterized in that, The circuit board is provided with microstrip lines, and the upper feed pin and the lower feed pin are respectively connected to the first bridge and the second bridge through the microstrip lines.

4. A circularly polarized antenna with a fence according to claim 3, characterized in that, The upper feed pin does not connect to the lower antenna radiating surface when it penetrates the lower antenna radiating surface.

5. A circularly polarized antenna with a fence according to claim 4, characterized in that, The number of the upper feed pin and the number of the lower feed pin are both 2.

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