Title

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

Title - Alternative

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.

Publication 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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