Importance

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Abstract

A highly efficient electronical and mechanical beam pointing vehicle antenna is disclosed. The structure is designed for a vehicle to maintain continued communication with a satellite while the vehicle is in motion. The structure is comprised of a group of left and right hand circularly polarized elements which are located and fixed to the center of the antenna structure. These feed elements are stacked and are electronically phased to obtain the elevation pointing. The feeds are wrapped around by a vane type polarizer which is designed to provide simultaneous operation of left and right hand circularly polarized signals and the radiation of the feed elements are symmetrically radiated over the entire 360 degree horizontal field of view. A very light weight mechanical driven parabolic cylindrical reflector, revolving around the feed assembly, is implemented to provide the 360 degrees azimuth coverage. The number of feed elements and the size of the parabolic cylindrical reflector are selected to satisfy the gain and beam performance needs. The parabolic cylindrical reflector and the symmetrical radiating feed elements are configured to help simplify the implementation of a beam pointing antenna to be placed on a moving vehicle. The design is configured for X-Band operation. However, the design and construction of the apparatus is applicable to other frequencies as well.

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First Claim