Conference Paper

Induced field ratios for metal and dielectric struts with application to blockage in symmetrical reflector antennas

Cap d'Ail, France
Conference: JINA '86: Journees Internationales de Nice sur les Antennes (JINA '86: Intenational Conference at Nice on Antennas), 4-6 Nov. 1986JINA '86: Journees Internationales de Nice sur les Antennes (JINA '86: Intenational Conference at Nice on Antennas), 4-6 Nov. 1986

ABSTRACT The induced field ratio (IFR) is an important parameter that determines the amount of blockage resulting from supporting struts in reflector antennas. The authors give a basic expression for the blockage in symmetrical antennas and show computed IFR values for four different struts with circularly symmetrical cross sections: metal cylinders, solid dielectric cylinders, dielectric tubes, and dielectric cylinders with a metal core. The results are presented in two different diagrams. One provides a general insight into the behaviour with size (or frequency), and the other is useful when comparing different possible struts in a practical design

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