Factorization of Antenna Efficiency of Aperture-type antenna: Beam Coupling and Two Spillovers. (arXiv:2003.05544v1 [astro-ph.IM])
<a href="http://arxiv.org/find/astro-ph/1/au:+Nagai_M/0/1/0/all/0/1">Makoto Nagai</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Imada_H/0/1/0/all/0/1">Hiroaki Imada</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Okumura_T/0/1/0/all/0/1">Taishi Okumura</a>
Antenna efficiency is one of the most important figures-of-merit of a radio
telescope, even for a multibeam radio telescope. To analyze a system where each
beam illuminates only a part of the aperture, a lossless antenna consisting of
two apertures in series is considered in the frame of the scalar wave
approximation. We found that its antenna efficiency is factorized into three
factors: efficiencies of beam coupling, transmission spillover, and reception
spillover. We numerically confirmed our factorization with an optical
simulation. The factorization is applicable to general aperture-type antennas
and is useful in design of multibeam radio telescopes.
Antenna efficiency is one of the most important figures-of-merit of a radio
telescope, even for a multibeam radio telescope. To analyze a system where each
beam illuminates only a part of the aperture, a lossless antenna consisting of
two apertures in series is considered in the frame of the scalar wave
approximation. We found that its antenna efficiency is factorized into three
factors: efficiencies of beam coupling, transmission spillover, and reception
spillover. We numerically confirmed our factorization with an optical
simulation. The factorization is applicable to general aperture-type antennas
and is useful in design of multibeam radio telescopes.
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