Radar antenna feed source and subreflector fixing structure

Abstract

A radar antenna feed source and auxiliary reflecting surface fixing structure relates to the field of radar antennas and comprises a sleeve, a feed source, a support, a main reflecting surface and an auxiliary reflecting surface. The main reflecting surface is provided with a sleeve, the sleeve is provided with a feed source, the feed source is provided with a support, the support is composed of a first flange, a second flange and a rib plate, positioning holes of the first flange and the second flange are coaxial, and the bottom mounting junction surfaces of the first flange and the second flange are perpendicular to the axes of the positioning holes of the first flange and the second flange; and the auxiliary reflecting surface is fixed on the first flange through a screw. The relative positions of the feed source and the auxiliary reflecting surface are positioned through the sleeve and the bracket, the structure is simple, the installation is easy, and the assembly efficiency and the antenna pointing precision can be greatly improved when the feed source and the auxiliary reflecting surface are assembled.

Description

Technical Field

[0001] The utility model belongs to the field of radar antennas, and in particular relates to a radar antenna feed source and a sub-reflector fixing structure. Background Art

[0002] The Cassegrain antenna is a commonly used antenna in microwave communications. It consists of a main reflector, a sub-reflector and a feed source. The sub-reflector reflects the electromagnetic wave emitted by the feed source once, reflects the electromagnetic wave to the main reflector, and then obtains a plane wave beam in the corresponding direction after reflection by the main reflector to achieve directional emission of the antenna. In order to ensure the relative position accuracy between the feed source, the main reflector and the radiation surface, the feed source is mainly positioned and installed in the form of a sleeve. The sub-reflector is installed by installing 4 brackets on the main reflector. The brackets jointly support a hollow cylinder with four sets of set screw holes on the cylinder. The sub-reflector is nested in the hollow cylinder and adjusts its position to meet the requirements through these four sets of set screws. Its shortcomings are: the process of adjusting the position of the sub-reflector is time-consuming and labor-intensive, the adjustment is difficult, and the installation accuracy is low. Utility Model Content

[0003] In view of the problems existing in the prior art, the utility model provides a radar antenna feed and sub-reflector fixing structure, which locates the relative positions of the feed and the sub-reflector by means of a sleeve and a bracket. It has a simple structure, is light in weight, and is easy to install. It can greatly improve the assembly efficiency and antenna pointing accuracy when assembling the feed and the sub-reflector.

[0004] The utility model adopts the following technical solutions:

[0005] A radar antenna feed and sub-reflector fixing structure comprises a sleeve, a feed, a bracket, a main reflector and a sub-reflector. The main reflector is provided with a sleeve, a feed is provided on the sleeve, a bracket is provided on the feed, the bracket is composed of a first flange, a second flange and a rib plate, the first flange and the second flange positioning holes are coaxial, and the first flange and the second flange bottom mounting joint surface are perpendicular to the first flange and the second flange positioning hole axis; the sub-reflector is fixed to the first flange by screws. The utility model locates the relative position of the feed and the sub-reflector by the sleeve and the bracket, has a simple structure and is easy to install, and can greatly improve the assembly efficiency and antenna pointing accuracy when assembling the feed and the sub-reflector.

[0006] Preferably, a stepped positioning hole is provided at the center of the bottom of the main reflecting surface.

[0007] Preferably, a positioning protruding step and a mounting flange are provided at the bottom of the sleeve, and a step positioning hole is provided at the top of the sleeve.

[0008] Preferably, the feed source is provided with two positioning protruding steps.

[0009] Preferably, the bracket is welded by a first flange, a second flange and four sets of ribs, the positioning holes of the first flange and the second flange are coaxial, and the bottom mounting joint surfaces of the first flange and the second flange are perpendicular to the axes of the positioning holes of the first flange and the second flange.

[0010] Preferably, the secondary reflective surface is provided with a positioning protruding step.

[0011] The beneficial effects of the utility model are:

[0012] A radar antenna feed and sub-reflector fixing structure locates the relative positions of the feed and the sub-reflector through a sleeve and a bracket. The structure is simple and easy to install. When the feed and the sub-reflector are assembled, the assembly efficiency and the antenna pointing accuracy can be greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the installation structure of the utility model.

[0014] Figure 2 It is a schematic diagram of the three-dimensional structure decomposition of the utility model.

[0015] Figure 3 for Figure 2 Schematic diagram of the local enlarged structure of part A.

[0016] Figure numerals: 1-sleeve, 2-feed source, 3-bracket, 4-secondary reflector, 5-primary reflector, 301-first flange, 302-second flange, 303-rib plate.

[0017] The product designed according to the utility model has been successfully applied to a radar antenna. The application shows that the fixing structure of the feed source and the sub-reflector of the new radar antenna is reasonable and feasible, easy to operate, and the relative positions of the feed source and the sub-reflector are positioned by the sleeve and the bracket. The structure is simple and easy to install, and the assembly efficiency and antenna pointing accuracy can be greatly improved when assembling the feed source and the sub-reflector. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] like Figure 1 , Figure 2As shown, a radar antenna feed source and sub-reflector fixing structure comprises a sleeve 1, a feed source 2, a bracket 3, a main reflector 5 and a sub-reflector 4. The main reflector 5 is provided with a sleeve 1, a step positioning hole and a mounting plane are provided at the bottom center of the main reflector 5, a positioning protruding step and a mounting flange are provided at the bottom of the sleeve 1, and the coaxiality between the sleeve 1 and the main reflector 5 is ensured by step positioning cooperation, a positioning hole coaxial with the bottom positioning protruding step is provided at the top of the sleeve 1, and at the same time, the mounting surface at the top of the sleeve 1 and the mounting flange surface of the bottom positioning step are required to be perpendicular to the axis of the sleeve 1.

[0020] In the utility model, a feed source 2 is provided on the sleeve 1, and the feed source 2 is provided with positioning protruding steps at the bottom and the top respectively. The protruding step surface at the bottom of the feed source 2 and the positioning hole at the top of the sleeve 1 cooperate to ensure coaxiality.

[0021] In the utility model, the feed source 2 is provided with a bracket 3, which is welded by a first flange 301, a second flange 302 and four sets of ribs 303. After completely removing the welding stress, the first flange 301 and the second flange 302 of the bracket 3 are finely processed. During processing, the positioning holes of the first flange 301 and the second flange 302 are required to be coaxial, and the bottom mounting joint surface of the first flange 301 and the second flange 302 is perpendicular to the axis of the positioning holes of the first flange 301 and the second flange 302. During installation, the positioning hole of the second flange 302 of the bracket 3 and the protruding step surface on the upper part of the feed source 2 are matched and positioned to ensure coaxiality.

[0022] In the present invention, the secondary reflector 4 is provided with a positioning boss. During installation, the positioning boss of the secondary reflector 4 and the positioning hole of the first flange 301 of the bracket 3 are matched and positioned to ensure coaxiality.

[0023] The utility model can achieve high position accuracy requirements between the feed source 2 and the sub-reflecting surface 4 relative to the main reflecting surface 5 through the sleeve 1 and the bracket 3. It has a simple structure and is easy to install. No adjustment is required after assembly, which can greatly improve the assembly efficiency and antenna pointing accuracy.

Claims

1. A radar antenna feed source and sub-reflector fixing structure, comprising a sleeve (1), a feed source (2), a bracket (3), a main reflector (5) and a sub-reflector (4), characterized in that: A sleeve (1) is provided on the main reflecting surface (5), a feed source (2) is provided on the sleeve (1), a bracket (3) is provided on the feed source (2), and the bracket (3) is composed of a first flange (301), a second flange (302) and a rib plate (303); the secondary reflecting surface (4) is fixed to the first flange (301) by means of screws.

2. The radar antenna feed source and sub-reflector fixing structure according to claim 1, characterized in that: A stepped positioning hole is provided at the center of the bottom of the main reflection surface (5).

3. The radar antenna feed source and sub-reflector fixing structure according to claim 1, characterized in that: The bottom of the sleeve (1) is provided with a positioning protruding step and a mounting flange, and the top of the sleeve (1) is provided with a step positioning hole.

4. The radar antenna feed source and sub-reflector fixing structure according to claim 1, characterized in that: The feed source (2) is provided with two concentric positioning protruding steps.

5. The radar antenna feed source and sub-reflector fixing structure according to claim 1, characterized in that: The bracket (3) is welded together by a first flange (301), a second flange (302) and four sets of rib plates (303); the positioning holes of the first flange (301) and the second flange (302) are coaxial, and the bottom mounting joint surfaces of the first flange (301) and the second flange (302) are perpendicular to the axes of the positioning holes of the first flange (301) and the second flange (302).

6. The radar antenna feed source and sub-reflector fixing structure according to claim 1, characterized in that: The secondary reflection surface (4) is provided with a positioning protruding step.

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