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A Spaceborne Cassegrain Umbrella Mesh SAR Antenna

An antenna and spaceborne technology, applied in the field of spaceborne synthetic aperture radar, can solve the problem of no Cassegrain SAR antenna, etc., and achieve the effects of light weight, high integration and high retraction rate

Active Publication Date: 2022-06-03
AEROSPACE INFORMATION RES INST CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The existing spaceborne SAR reflector antennas all adopt a single reflector configuration, and there is no Cassegrain SAR antenna with a spaceborne double reflector configuration.

Method used

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  • A Spaceborne Cassegrain Umbrella Mesh SAR Antenna
  • A Spaceborne Cassegrain Umbrella Mesh SAR Antenna
  • A Spaceborne Cassegrain Umbrella Mesh SAR Antenna

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Embodiment Construction

[0046] In order to understand the characteristics and technical contents of the embodiments of the present application in more detail, the implementation of the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. The attached drawings are only for reference and description, and are not intended to limit the embodiments of the present application.

[0047] In the description of the embodiments of the present application, it should be noted that unless otherwise stated and limited, the term "connection" should be understood in a broad sense, for example, it can be an electrical connection, it can also be the internal communication of two components, and it can be a direct connection , can also be indirectly connected through an intermediary, and those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.

[0048] It should be noted that the term "fi...

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Abstract

The embodiment of the present application discloses a spaceborne Cassegrain umbrella mesh SAR antenna, including: an antenna base arranged along the axial direction, a main reflector, a feed source, a linkage mechanism and a sub-reflector; the main reflector It includes a plurality of support ribs that can be folded in sections evenly distributed along the antenna base and a reflective mesh surface attached to the upper surface of the support ribs. When the antenna is fully unfolded, the upper surface of the reflective mesh surface forms a A continuous parabolic surface; the sub-reflector is connected to the antenna base through the linkage mechanism, the reflection surface of the sub-reflector is a hyperboloid, and the focal axis of the main reflector and the sub-reflector The focal axis of the reflector coincides, and the first focal point of the reflecting surface coincides with the focal point of the parabolic surface; the feed source is arranged on the base of the antenna and is located between the main reflector and the secondary reflector , the phase center of the feed coincides with the second focal point of the reflective surface.

Description

technical field [0001] The present application relates to the technical field of spaceborne synthetic aperture radar, in particular to a spaceborne Cassegrain umbrella mesh SAR antenna. Background technique [0002] The Cassegrain antenna is a kind of reflector antenna. Its antenna structure is characterized by the introduction of a secondary reflector, which changes the feed-forward feed structure into a feed-back feed structure antenna, so that the electromagnetic waves radiated by the feed It is reflected twice by the secondary surface and the main surface, and reaches the aperture surface of the main reflection surface. [0003] At present, the development of spaceborne synthetic aperture radar (Synthetic Aperture Radar, SAR) reflector antenna has the following trends: [0004] Larger aperture of the antenna: a reflector antenna with a large aperture will obtain higher directivity performance and antenna gain, and the deployment mechanism of the antenna needs to have a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/16H01Q15/14H01Q19/13H01Q19/19H01Q1/28
CPCH01Q15/161H01Q15/14H01Q19/13H01Q19/19H01Q1/288
Inventor 艾晨光熊永虎王楠
Owner AEROSPACE INFORMATION RES INST CAS
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