Umbrella type unfolded reticular antenna

Abstract

The invention relates to an umbrella type unfolded reticular antenna which comprises a base; the base is fixed with a center solid reflecting surface; a plurality of waveguide type supporting rods are vertically connected with the center solid reflecting surface; a plurality of articulated mechanisms are fixed at the periphery of the edge of the base and are respectively connected with a radial rib so that the folded or unfolded radial ribs are uniformly distributed at the periphery of the center solid reflecting surface; reflecting screen meshes are fixed on the surfaces of the radial ribs and form a needed reflecting surface with the center solid reflecting surface; slotted type compressing blocks are fixed on the radial ribs, and annular compressing ropes are arranged in slots of the slotted type compressing blocks; the annular compressing ropes are tightened up to restrain the radial ribs in the foldable state to form an annular end-to-end closing structure; the annular compressing ropes are connected with a cutter which is used for cutting the annular compressing ropes; the articulated mechanisms are used for providing driving torque so as to unfold the radial ribs; the waveguide type supporting rods are internally provided with a plurality of feed waveguide channels; and a multiple-beam feed source loudspeaker array is arranged at the top of the supporting rods and is connected with the supporting rods through irregular waveguides.

Description

technical field [0001] The invention relates to an umbrella-type expandable mesh antenna, which can be used in an X-band space-borne synthetic aperture radar system. Background technique [0002] Spaceborne Synthetic Aperture Radar (SAR) can realize the observation of the earth's surface all-weather and all-time, and obtain high-resolution images of ground targets. It has broad application prospects in the fields of national economy and national defense. The spaceborne SAR antenna system is an important part of the spaceborne synthetic aperture radar system. It is mainly composed of the antenna and the antenna extension mechanism. The composition of the antenna depends on the form of the antenna. For a parabolic antenna, it includes the reflector and the feed. For planar array antennas, it includes the array and feed network. At present, the typical ones that are successfully applied are planar array antenna, mesh parabolic antenna and solid parabolic antenna. [0003] Th...

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Problems solved by technology

Although the metal mesh surface is discontinuous, unlike the

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