WO2012113293A1

WO2012113293A1 - Dual reflector antenna

Info

Publication number: WO2012113293A1
Application number: PCT/CN2012/071077
Authority: WO
Inventors: 唐振宇; 王少龙; 廖星; 肖凌文; 郭智力
Original assignee: 华为技术有限公司
Priority date: 2011-02-21
Filing date: 2012-02-13
Publication date: 2012-08-30
Also published as: CN202042599U

Abstract

Provided in the embodiments of the present invention is a dual reflector antenna. The dual reflector antenna comprises a feed source, a main reflector and an antenna housing, wherein the feed source is located at the center of the main reflector; the antenna housing is provided above the main reflector; a subreflector is provided at the center region of the antenna housing; the virtual focus of the subreflector coincides with the real focus of the main reflector. The dual reflector antenna in the embodiments of the present invention can reduce transmission loss and enhance the operating efficiency of the dual curved-surface antenna, by providing the subreflector at the center region of the antenna housing, without shielding between the feed source and the subreflector. In addition, the dual reflector antenna in the embodiments of the present invention has a simple structure. As compared with the prior art, it omits the mounting of metal supporting rods or dielectric supporting rods, is easier to mount and operate and very convenient to maintain and disassemble.

Description

Double Reflector Antenna This application claims priority to Chinese Application No. 201120045781.8, entitled "Double Reflector Antenna", which is hereby incorporated by reference. Technical field

The embodiments of the present invention relate to the field of communications technologies, and in particular, to a dual-reflecting surface antenna. Background technique

Microwave communication is a communication system in which a microwave is used as a carrier. In a microwave system, an antenna is used to perform a conversion of a guided wave to a radiated wave. Specifically, the radio frequency signal is converted into electromagnetic wave to space radiation on the transmitting link, and the electromagnetic wave is converted into a radio frequency signal on the receiving link.

The structure of the antenna in microwave communication is usually in the form of a parabolic antenna. The common parabolic antenna is divided into a feedforward antenna and a feedforward antenna. 1 is a cross-sectional view of a feedforward antenna in the prior art. As shown in Figure 1, the primary lobe pattern of the feedforward antenna is determined by feed 1. The feed 1 is mounted on the focus of the parabolic reflecting surface 2. 2 is a cross-sectional view of a feedforward antenna in the prior art. As shown in Fig. 2, the primary lobe pattern of the feedforward antenna is determined by a composite feed system composed of a feed 3 and a sub-reflection surface 4. The feed 3 is mounted at the center of the parabolic reflecting surface 5, and the virtual focus of the secondary reflecting surface 4 coincides with the real focus of the parabolic reflecting surface 5. In essence, in the feedforward antenna, the feed 3 is a primary antenna that radiates electromagnetic waves toward the secondary reflecting surface 4. The parabolic reflecting surface 5 is a passive device that reflects the energy radiated from the feed 3 reflected by the sub-reflecting surface 4, and the reflected beam has a certain directivity and has the same phase in a plane perpendicular to the propagation direction. The secondary reflecting surface 4 is usually formed by spraying metal powder on the surface of the medium. The feed-back antenna structure is an antenna with a double reflection surface, wherein the parabolic reflection surface 5 is a main reflection surface, and the sub-reflection surface 4 is a sub-reflection surface. Therefore, the feedforward antenna can also be called a double reflector antenna.

Figure 3 is a cross-sectional view of a prior art dual-reflector antenna. For the secondary reflector Fixing, the double-reflecting surface antenna shown in FIG. 3 is based on the antenna structure shown in FIG. 2, and the metal supporting rod 6 is used, and the metal supporting rod 6 is mounted on the parabolic reflecting surface 5 to support the sub-reflecting surface 4, The sub-reflecting surface 4 is fixed above the parabolic reflecting surface 5. For example, four metal support rods 6 can generally be used. FIG. 4 is a cross-sectional view showing another dual-reflecting surface antenna of the prior art. As shown in FIG. 4, the double-reflecting surface antenna shown in FIG. 4 is based on the antenna structure shown in FIG. 2, and a dielectric support rod 7 is used, which is supported by connecting the medium support rod 7 above the feed source 3. A secondary reflecting surface 4 above the medium support rod 7. As shown in FIG. 4, a radome 8 may be disposed above the parabolic reflecting surface 5.

In the prior art, at least the following problems exist: The prior art dual-reflecting surface antenna shown in Fig. 3 uses a metal support rod to block the aperture of the antenna, causing the side lobes to rise and affecting the antenna efficiency. The prior art dual-reflection antenna shown in Fig. 4 uses the dielectric support rod in electrical performance, and the introduction of the medium causes loss and affects the antenna efficiency. Moreover, the existing two double-reflecting surface antennas have high requirements on the mounting accuracy of the metal support rod 6 or the medium support rod 7. If the installation is not standard, the working efficiency of the hyperboloid antenna is lowered. Summary of the invention

The embodiment of the invention provides a double-reflecting surface antenna for solving the defect that the antenna working efficiency is low due to the double-reflecting surface antenna structure in the prior art.

An embodiment of the present invention provides a dual-reflecting surface antenna, including a feed, a main reflecting surface, and a radome, wherein the feeding source is located at a center of the main reflecting surface, and the radome is disposed above the main reflecting surface; A sub-reflecting surface is disposed in a central region of the radome; a virtual focus of the sub-reflecting surface coincides with a real focus of the main reflecting surface.

The double-reflecting surface antenna described above, wherein the sub-reflecting surface and the radome are integrated into an integrated structure.

The dual-reflecting surface antenna described above, wherein the secondary reflecting surface comprises a parabolic substrate, and a layer of metal powder sprayed on the parabolic substrate in a direction toward the feed. The dual-reflection surface antenna described above, wherein a center of the main reflection surface, a center of the sub-reflection surface, and a center of the feed are collinear.

The double-reflecting surface antenna described above, wherein the main reflecting surface and the sub-reflecting surface are parabolic surfaces, rotating hyperboloids, or elliptical surfaces.

According to the dual-reflecting surface antenna of the embodiment of the present invention, by providing a sub-reflecting surface in the central region of the radome, there is no occlusion between the feeding source and the sub-reflecting surface, thereby reducing transmission loss and improving the working efficiency of the hyperbolic antenna, and The double-reflecting surface antenna of the embodiment of the invention has a structural unit. Compared with the prior art, the installation of the metal support rod or the medium support rod is omitted, the installation operation is easier, and the maintenance and disassembly is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are used in the description of the embodiments of the invention, Other drawings may also be obtained from these drawings without the inventive labor.

1 is a cross-sectional view of a feedforward antenna in the prior art.

2 is a cross-sectional view of a feedforward antenna in the prior art.

3 is a cross-sectional view of a prior art dual-reflection antenna.

4 is a cross-sectional view of another dual-reflecting surface antenna of the prior art.

FIG. 5 is a cross-sectional view of a dual-reflecting surface antenna according to an embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. Based on the embodiments of the present invention, those of ordinary skill in the art obtain the following without creative efforts. All other embodiments obtained are within the scope of the invention.

FIG. 5 is a cross-sectional view of a dual-reflecting surface antenna according to an embodiment of the present invention. As shown in FIG. 5, the dual-reflecting surface antenna of this embodiment includes a feed 10, a main reflecting surface 11 and a radome 12, wherein the feeding source 10 is located at the center of the main reflecting surface 11, and the radome 12 is disposed at the main reflecting surface 11. Above; a sub-reflecting surface 13 is provided in a central region of the radome 12; a virtual focal point of the secondary reflecting surface 13 coincides with a real focal point of the main reflecting surface 11. The main reflecting surface 11 and the sub-reflecting surface 13 may each be a paraboloid, a rotating hyperboloid, or an elliptical surface, as long as the virtual focus of the sub-reflecting surface 13 and the real focal point of the main reflecting surface 13 coincide.

The main reflecting surface 11 in this embodiment is exemplified by a standard paraboloid. The feed 10 here can be a circular waveguide type feed or a horn shape. When a point on the axis in the horn of the horn is used as the observation point, the difference between the maximum phase and the minimum phase on the radiation phase pattern of the horn is less than or equal to be regarded as the phase center. For details, reference may be made to the prior art. Let me repeat. The radome 12 is used to protect the feed 10 and the main reflective surface 11 of the dual-reflector antenna from the natural environment. The radome 12 needs to provide a suitable interface to maintain the structure, temperature and air. At the same time as the dynamic characteristics, the radome 12 is required to have minimal impact on the electrical performance of the antenna.

The dual-reflection antenna of this embodiment is used as follows: The microwave signal enters the feed 10 from the input 9 of the dual-reflector antenna, and the microwave signal is radiated from the feed 10 through its open aperture 101. The microwave signal is transmitted to the sub-reflecting surface 13 of the central region of the radome 12, since the virtual focus of the secondary reflecting surface 13 coincides with the phase center of the feed 10 at the position A (at the same time, the real focus of the main reflecting surface 11 at the position A) The microwave signal is transmitted to the main reflection surface 11 by one reflection. Since the microwave signal is transmitted from the real focus of the main reflection surface 11, that is, the position A, the microwave signal is reflected from the main reflection surface 11 in the form of a plane wave. The portion of the radome 12 that is not blocked by the sub-reflecting surface is radiated.

In the dual-reflecting surface antenna of the embodiment, by providing a sub-reflecting surface in the central region of the radome, there is no occlusion between the feeding source and the sub-reflecting surface, which can reduce transmission loss and improve the operation of the hyperboloid antenna. The efficiency, and the double-reflecting surface antenna of the embodiment, is structurally simple. Compared with the prior art, the installation of the metal support rod or the medium support rod is omitted, the installation operation is easier, and the maintenance and disassembly is very convenient.

It should be noted that, on the basis of the above technical solution, when the sub-reflecting surface 13 is disposed in the central region of the radome 12, the radome 12 may be directly shaped to form a parabolic shape in the central region of the radome 12. The sub-reflecting surface 13, that is, the sub-reflecting surface 13 and the radome 12 may have an integrated structure.

It should be noted that, in addition to the above technical solution, the sub-reflecting surface 13 may be disposed independently of the radome 12 and disposed on the radome 12. For example, the secondary reflecting surface 13 may include a parabolic substrate, and a layer of metal powder sprayed on the parabolic substrate in the direction toward the feed 10 to form the secondary reflecting surface 13.

It should be noted that, as shown in FIG. 5, when the dual-reflecting surface antenna of the above embodiment is installed and used, the center of the main reflecting surface (at the position of the input end 9 > the center 121 of the sub-reflecting surface and the center of the feed ( For example, the center of the bell mouth) should always be on the same line.

According to the technical solution of the foregoing embodiment, the transmission between the feed and the sub-reflecting surface of the double-reflecting surface antenna is not blocked, and the transmission loss can be effectively reduced, and the structure of the double-reflecting surface antenna of the embodiment is simple and easy to disassemble. In addition, the double-reflecting surface antenna of this embodiment is easy to implement in the process and has high achievability. Moreover, the secondary reflecting surface of the double-reflecting surface antenna of the embodiment can be integrated with the radome, which can reduce the material for fabricating the antenna and reduce the cost of fabricating the double-reflecting antenna.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Claim

What is claimed is: 1. A dual-reflecting surface antenna comprising: a feed source, a main reflecting surface and a radome, wherein the feeding source is located at a center of the main reflecting surface, and the radome is disposed above the main reflecting surface; A sub-reflecting surface is disposed in a central region of the radome; a virtual focus of the secondary reflecting surface and a real focal point of the main reflecting surface coincide.

The double-reflecting surface antenna according to claim 1, wherein the sub-reflecting surface and the radome are integrated into an integrated structure.

3. The dual-reflecting surface antenna according to claim 1, wherein the secondary reflecting surface comprises a parabolic substrate, and a layer of metal powder sprayed on the parabolic substrate in a direction toward the feed.

The double-reflecting surface antenna according to any one of claims 1 to 3, wherein a center of the main reflecting surface, a center of the sub-reflecting surface, and a center of the feed are collinear.

The double-reflecting surface antenna according to any one of claims 1 to 3, wherein the primary reflecting surface and the secondary reflecting surface are paraboloids, a hyperboloid, or an elliptical surface.