Analysis of Electrically Small Hyperbolic Subreflectors Utilizing the Geometrical Theory of Diffraction
作者:
C.G. Christodoulou,
D.C. Cook,
期刊:
Journal of Electromagnetic Waves and Applications
(Taylor Available online 1993)
卷期:
Volume 7,
issue 7
页码: 987-1004
ISSN:0920-5071
年代: 1993
DOI:10.1163/156939393X00156
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
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 λ 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 λ -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.
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