Wide-angle beam scanning reflector antenna

Abstract

The invention discloses a wide-angle beam scanning reflector antenna which has the advantages of low power consumption, high transmission efficiency and unlimited polarization mode. According to the technical scheme of the invention, an azimuth servo mechanism is connected with a pitch servo mechanism to form a combined two-dimensional servo mechanism; the two-dimensional servo mechanism is connected with a sputter plate (3); a feed source (4) is fixed at the center of the sputter plate through a waveguide feed line (10); a reflector (2) connected by a bent structural member (9) fixedly arranged on an antenna platform (1) is arranged below the sputter plate; the azimuth servo mechanism drives the pitch servo mechanism to drive the sputter plate to rotate around an azimuth rotation axis (7)and a pitch rotation axis (8), so as to realize limited scanning of the pitch plane of an antenna beam and wide angle scanning of the azimuth plane; after an electromagnetic wave is transmitted by the feed source to the reflector, the electromagnetic wave is reflected, defocused and projected onto the sputter plate; and after being reflected by the mirror image of the sputter plate, the electromagnetic wave is emitted.

Description

technical field [0001] The invention relates to a reflector antenna widely used in various fields such as communication, radar, microwave communication, satellite communication, tracking and remote sensing. More specifically, the present invention relates to a reflector antenna whose feed source is fixed and which realizes wide-angle scanning of azimuth beams by rotating a sputtering plate. Background technique [0002] In recent years, reflector antennas have become a mainstay in satellite communications. However, technologies such as satellite communication put forward high requirements for wide-angle scanning performance on the dual-reflector antenna, which requires the antenna to be in a large wide-angle scanning range, the radiation pattern is too distorted, the gain loss is small, and the sidelobe level fulfil requirements. Mechanically scanned reflector antennas, in particular, require careful consideration of mechanical design details. Reflective surfaces must be ...

AI Technical Summary

Problems solved by technology

[0007] (2) The feed pattern should have low side lobes and low cross polarization. Excessive side lobes or back lobes will affect the performance of the antenna, causing the gain to decrease and the side lobes to become higher; the cross polarization level is usually lower than - 30dB

A notable feature of this antenna is that the application of the polarization method is limited, and it is only suitable for linear polarization applications

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