A dual-polarized Yagi antenna

Abstract

The present application relates to the field of antenna technology, and in particular to a dual-polarized Yagi antenna, comprising two high-frequency radiation units, the bottoms of the two high-frequency radiation units being jointly arranged on a reflection plate; a first director, which is arranged above the high-frequency radiation unit and is parallel to the upper surface of the high-frequency radiation unit; a plurality of second directors, which are sequentially and parallelly arranged directly above the first director, and the distance between two adjacent second directors is equal; the dual-polarized Yagi antenna of the present application achieves performance indicators such as high gain and narrow bandwidth; the antenna has a simple structure, uses less materials, and is low in cost.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a dual-polarized Yagi antenna. Background Art

[0002] At present, the coverage frequency band of most tunnel antennas is still on the 4G frequency band, and poor signals often occur when passing through tunnels or taking the subway. With the rapid development of communication technology, especially the advent of the 5G era, the coverage demand for 5G signals is becoming increasingly important. 5G signals have the characteristics of high downlink speed, large network capacity and low latency.

[0003] The industry is in urgent need of an antenna that can maintain high performance in special environments such as subways and tunnels to meet the communication needs of 4G and 5G networks. Summary of the invention

[0004] To solve the above problems, the present application provides a dual-polarized Yagi antenna to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] In order to achieve the above object, the present application provides a dual-polarized Yagi antenna, comprising:

[0006] Two high-frequency radiation units, the bottoms of the two high-frequency radiation units are jointly arranged on the reflection plate;

[0007] A first director, which is arranged above the high-frequency radiation unit and parallel to the upper surface of the high-frequency radiation unit;

[0008] A plurality of second directors are arranged in parallel in sequence directly above the first director, and the distance between two adjacent second directors is equal.

[0009] Furthermore, the left and right ends of the reflection plate are symmetrically arranged in an arc shape, the two high-frequency radiation units are symmetrically arranged on both sides of the central axis in the up-down direction, and the center points of the two high-frequency radiation units are both located on the central axis in the left-right direction.

[0010] Furthermore, the first director and the high-frequency radiation unit, the first director and the second director, and two adjacent second directors are connected via a connecting column.

[0011] Furthermore, the high-frequency radiation unit includes an antenna vibrator and two feeding plates, the antenna vibrator includes two pairs of radiating surfaces arranged diagonally, and each pair of radiating surfaces is respectively provided with a feeding positioning column and a feeding positioning hole; one end of the feeding plate is electrically connected to the feeding positioning column of the antenna vibrator, and the other end passes through the feeding positioning hole to connect to the coaxial line.

[0012] Furthermore, the first director includes a cylinder and two rectangular grooves, the notches of the two rectangular grooves are fitted with the circular end faces of the cylinder, and the central axes of the two rectangular grooves are perpendicular to each other and intersect at the central axis of the cylinder.

[0013] Furthermore, the second director is cylindrical.

[0014] Furthermore, there are 13 second directors in total.

[0015] Furthermore, the distance between the two high-frequency radiation units is not less than a set threshold.

[0016] The beneficial effects of the present application are as follows: the present application provides a dual-polarized Yagi antenna, which uses two high-frequency radiation units, a first director and a plurality of second directors to obtain a dual-polarized four-port Yagi antenna, wherein the reflector, the first director and the plurality of second directors have equal radiation effects on the two polarized antenna elements, so that the Yagi antenna achieves performance indicators such as high gain and narrow wave width. The antenna has a simple structure, uses less materials and is low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 This is a schematic diagram of the overall structure of the dual-polarized Yagi antenna in the embodiment of the present application;

[0019] Figure 2 A top view of the first director in the embodiment of the present application;

[0020] Figure 3 This is a three-dimensional schematic diagram of a dual-polarized high-frequency radiation unit in an embodiment of the present application;

[0021] Figure 4 1 is a top view of the dual-polarized Yagi antenna in an embodiment of the present application. DETAILED DESCRIPTION

[0022] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0023] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0024] In the description of this application, if there are words such as "several", it means one or more, and the meaning of "more" is more than two. Greater than, less than, and more than are understood as not including the number itself, and above, below, and within are understood as including the number itself. If there is a description of the first and the second, it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features. In the description of this application, unless otherwise clearly defined, the words such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meaning of the above words in this application in combination with the specific content of the technical solution.

[0025] In order to solve the problems in the background technology, the inventors found through research that the Yagi antenna has the characteristics of good directivity and high gain, and also has the structural characteristics of simple installation and low wind resistance, and is suitable for subway and tunnel environments. Based on this, the present application provides a dual-polarized Yagi antenna that meets the signal requirements of the 4G frequency band and part of the 5G frequency band, and has a simple structure and low manufacturing cost.

[0026] Reference Figure 1 , the present application provides a dual-polarized Yagi antenna, comprising:

[0027] Two high-frequency radiation units 100, the bottoms of the two high-frequency radiation units 100 are jointly arranged on the reflection plate 200;

[0028] A first director 300, which is disposed above the high-frequency radiation unit 100 and is parallel to the upper surface of the high-frequency radiation unit 100;

[0029] A plurality of second directors 400 are arranged in parallel and in sequence directly above the first director 300 , and the distance between two adjacent second directors 400 is equal.

[0030] It should be noted that the reflector 200 is made of metal; the frequency band of the high-frequency radiation unit 100 is 3300MHz-3800MHz. In the embodiment provided by the present application, two high-frequency radiation units 100, a first director 300 and a plurality of second directors 400 are used to obtain a dual-polarized four-port Yagi antenna. The reflector 200, the first director 300 and the plurality of second directors 400 have equal radiation effects on the two polarized antenna elements 110, so that the Yagi antenna achieves performance indicators such as high gain and narrow wave width. The antenna has a simple structure, uses less materials and is low in cost.

[0031] Reference Figure 2 In some embodiments, the left and right ends of the reflective plate 200 are symmetrically arranged in an arc shape, the two high-frequency radiation units 100 are symmetrically arranged on both sides of the central axis in the up-down direction, and the center points of the two high-frequency radiation units 100 are both located on the central axis in the left-right direction.

[0032] In this embodiment, the radiation parameters are consistent by keeping the two independent high-frequency radiation units 100 at the same distance from the boundary of the reflector 200. The left and right ends of the reflector 200 are symmetrically arranged in arc shapes to form a quasi-ellipse, thereby achieving higher radiation gain.

[0033] In some embodiments, the first director 300 and the high-frequency radiation unit 100 , the first director 300 and the second director 400 , and two adjacent second directors 400 are connected via a connecting column 500 .

[0034] In one embodiment, the model of the connecting column 500 is an M3 plastic column or a copper rod, so that the number of the second directors 400 can be adjusted and the gain of the dual-polarization Yagi antenna can be adjusted according to actual conditions.

[0035] Reference Figure 3 In some embodiments, the high-frequency radiation unit 100 includes an antenna vibrator 110 and two feeding plates 120, the antenna vibrator 110 includes two pairs of radiating surfaces 111 arranged diagonally, and each pair of radiating surfaces 111 is respectively provided with a feeding positioning column 112 and a feeding positioning hole 113; one end of the feeding plate 120 is electrically connected to the feeding positioning column 112 of the antenna vibrator 110, and the other end passes through the feeding positioning hole 113 to connect to the coaxial line.

[0036] In a specific embodiment, the high-frequency radiation unit 100 includes an antenna element 110 with a frequency range of 3300MHz-3800MHz, and its frequency range can meet the frequency requirements of some 5G tunnel coverage. The antenna element 110 is made of metal die-casting, and one end of the feeding plate 120 is welded to the antenna element 110, and the other end is welded to the coaxial line. The coaxial line is directly fed to realize the ±45° dual polarization function.

[0037] Reference Figure 4 In some embodiments, the first director 300 includes a cylinder 310 and two rectangular grooves 320, the notches of the two rectangular grooves 320 are fitted with the circular end surfaces of the cylinder 310, and the central axes of the two rectangular grooves 320 are perpendicular to each other and intersect at the central axis of the cylinder 310.

[0038] In this embodiment, the two rectangular grooves 320 are used to adjust the directional performance of the antenna to form ±45° dual polarization. In some embodiments, the notches of the two rectangular grooves 320 are integrally formed with the cylinder 310, and the second director 400 is cylindrical.

[0039] In this embodiment, the use of the cylinder 310 as the second director 400 can make the radiation effects in the two polarization directions equal.

[0040] In some embodiments, the distance between the two high-frequency radiation units 100 is not less than a set threshold.

[0041] In the embodiment provided in the present application, there is a certain distance between the two high-frequency radiation units 100, which affects the isolation and the radiation of the antenna pattern, and avoids the distortion of the antenna patterns of the two independent antenna elements 110.

[0042] In a specific embodiment, the distance between the center points of the antenna vibrators 110 in the two high-frequency radiation units 100 is not less than 150 mm, the maximum length of the reflector 200 is 225 mm, the width is 75 mm, and the upper and lower ends are straight lines; the center point of the antenna vibrator 110 is 32.5 mm away from the closer edge of the reflector 200, and 37.5 mm away from the upper and lower edges of the reflector 200; the radius of the cylinder 310 in the first director 300 is 8 mm, the thickness is 0.8 mm, the length of the rectangular groove 320 is 10 mm, the width is 5 mm, and the thickness is 0.8 mm; the radius of the second director 400 is 18.2 mm, and the thickness is 0.8 mm.

[0043] In one embodiment, there are 13 second directors 400 in total.

[0044] At this time, the antenna has the best performance. The distance between two adjacent second directors 400 is equal, which can improve production efficiency. In one embodiment, the distance between two adjacent second directors 400 is 12 mm.

[0045] It should be noted that if it is necessary to increase the gain of the dual-polarized Yagi antenna, the number of second directors 400 can be further increased. Since the tunnel may be curved, affecting the communication quality, in order to solve the communication problems in such scenarios, the inventors conducted multiple experiments in order to test the best equilibrium point, but no good linear relationship or consistent law was found, and it was difficult to achieve the ideal communication effect. After research, it was found that increasing the number of second directors 400 would cause the beam width to become narrower. It was unexpectedly discovered that using a total of 13 second directors 400 can not only achieve a relatively wide beam width, but also avoid incomplete signal coverage caused by narrowing the beam width, thereby reducing the potential safety hazards caused by incomplete signal coverage. Moreover, this form of dual-polarized Yagi antenna has a low height, good wind resistance, and is not easy to fall off. It is not only conducive to installation and use in scenes such as tunnels and subways, but also can reduce the risk of antenna falling off due to excessive wind resistance, thereby reducing safety hazards.

[0046] The dual-polarized Yagi antenna provided in this application is not only simple in structure, but also can meet the dual-polarized (3300MHZ-3800MHZ) working frequency band, and has four ports, each port standing wave ratio (VSWR) is better than the tunnel dual-polarized Yagi antenna below 1.5, and its working frequency band covers most of the 5G frequency band. On the premise of meeting various performance indicators of the antenna, the overall height of the antenna is also reduced, so that the wind resistance of the antenna is improved; the elliptical reflector 200 achieves higher radiation gain.

[0047] Although the description disclosed in the present application has been quite detailed and specifically describes several described embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but should be regarded as providing a broad possible interpretation of these claims by reference to the attached claims, taking into account the prior art, so as to effectively cover the intended scope disclosed in the present application. In addition, the above description of the present application is based on the embodiments foreseeable by the inventor, and its purpose is to provide a useful description, and those non-substantial changes to the present application that have not yet been foreseen may still represent equivalent changes to the present disclosure.

Claims

1. A dual-polarized Yagi antenna, characterized in that: include: Two high-frequency radiation units (100), the bottoms of the two high-frequency radiation units (100) being jointly arranged on a reflection plate (200); A first director (300) disposed above the high-frequency radiation unit (100) and parallel to the upper surface of the high-frequency radiation unit (100); a plurality of second directors (400), wherein the plurality of second directors (400) are sequentially arranged in parallel directly above the first director (300), and the distance between two adjacent second directors (400) is equal; The high-frequency radiation unit (100) comprises an antenna vibrator (110) and two feeding plates (120); the antenna vibrator (110) comprises two pairs of diagonally arranged radiation surfaces (111); each pair of radiation surfaces (111) is respectively provided with a feeding positioning column (112) and a feeding positioning hole (113); one end of the feeding plate (120) is electrically connected to the feeding positioning column (112) of the antenna vibrator (110), and the other end passes through the feeding positioning hole (113) to connect to the coaxial line.

2. The dual-polarized Yagi antenna according to claim 1, characterized in that: The left and right ends of the reflection plate (200) are symmetrically arranged in an arc shape, the two high-frequency radiation units (100) are symmetrically arranged on both sides of the central axis in the up-down direction, and the center points of the two high-frequency radiation units (100) are both located on the central axis in the left-right direction.

3. The dual-polarized Yagi antenna according to claim 1, characterized in that: The first director (300) and the high-frequency radiation unit (100), the first director (300) and the second director (400), and two adjacent second directors (400) are all connected via a connecting column (500).

4. The dual-polarized Yagi antenna according to claim 1, characterized in that: The first director (300) comprises a cylinder (310) and two rectangular grooves (320), the notches of the two rectangular grooves (320) being fitted with the circular end faces of the cylinder (310), and the central axes of the two rectangular grooves (320) being perpendicular to each other and intersecting at the central axis of the cylinder (310).

5. The dual-polarized Yagi antenna according to claim 1, characterized in that: The second director (400) is cylindrical.

6. The dual-polarized Yagi antenna according to claim 1, characterized in that: The distance between the two high-frequency radiation units (100) is not less than a set threshold.

7. The dual-polarized Yagi antenna according to claim 1, characterized in that: There are 13 second directors (400) in total.

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