Analysis Of Electrically Small Hyperbolic Subreflectors Utilizing The Geometrical-Theory Of Diffraction

    Authors

    C. G. Christodoulou;D. C. Cook

    Comments

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    Abbreviated Journal Title

    J. Electromagn. Waves Appl.

    Keywords

    Engineering, Electrical & Electronic; Physics, Applied

    Abstract

    Cassegrain antennas have been utilized in applications where small size is critical. It has been observed that for antennas having subreflectors of the order of only several lambda in diameter, near-in sidelobe levels rise beyond normally predicted values. E-plane sidelobes are often several dB higher than those in the H-plane. Disturbances in the illumination of the primary reflector due to diffraction limitations of the electrically small subreflector are a possible cause of the sidelobe phenomenon. In this work, the results for 3 to 8 lambda-diameter hyperboloidal subreflectors, using the geometrical theory of diffraction (GTD) are presented and compared with the physical optics approach and other data. Degradation of the scatter patterns are observed as the subreflector size is decreased, and the differences in the E-and H-plane phase and amplitude patterns are observed in the GTD solution.

    Journal Title

    Journal of Electromagnetic Waves and Applications

    Volume

    7

    Issue/Number

    7

    Publication Date

    1-1-1993

    Document Type

    Article

    Language

    English

    First Page

    987

    Last Page

    1004

    WOS Identifier

    WOS:A1993LL80000006

    ISSN

    0920-5071

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