The main components of a multifrequency antenna system for propagation experiments with the large telecommunications satellite Olympus are reviewed. The antenna system consists of a classical dual reflector Cassegrain antenna with a single aperture multifrequency primary feed system. The 12/20/30 GHz beacons of Olympus provide stable and pure signals for the direct measurement of atmospheric influences on radio wave propagation, and they provide a directional reference for the alignment of ground station antennas. The geometry and the electrical characteristics of a classical Cassegrain antenna, with a corrugated horn primary feed, are considered, including geometrical relationships, strut geometry, subreflector size, illumination taper, blocking, surface accuracy, polarization efficiency, and on-axis polarization discrimination. The feed system consists of a horn antenna and a microwave network. At each of the beacon frequencies, the radiation pattern of the feed system is required to have axial symmetry, low cross polarization, and a prescribed amplitude decay. These requirements can be met by using a corrugated horn supporting balanced hybrid modes at these frequencies.


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    Title :

    Multifrequency Antenna System for Propagation Experiments with the Olympus Satellite (Revised)


    Contributors:

    Publication date :

    1988


    Size :

    67 pages



    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English