Equivalence of Physical Optics and Aperture Field Integration Method in the Full Pattern Analysis of Reflector Antennas

概要

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Physical optics (PO) and the aperture field integration method (AFIM) give accurate and similar field patterns near the first few sidelobes of reflector antennas. It is widely accepted that the use of AFIM is restricted to narrower angles than PO. In this paper, uniform equivalent edge currents of PO and AFIM are compared analytically and their equivalence in high frequency is discussed. It is asymptotically verified that the patterns by AFIM are almost identical to PO fields in the full 360°angular region, provided that AFIM uses the equivalent surface currents consisting of two components, that is, the geometrical optics (GO) reflected fields from the reflector and the incident fields from the feed source, the latter of which are often neglected. Slightly weaker equivalence is predicted for cross polarization patterns. Numerical comparison of PO and AFIM confirms all these results; the equivalence holds not only for large but also for a very small reflector of the order of one wavelength diameter.
社団法人電子情報通信学会の論文
1996-08-25