The radiation and scattering properties of resonant region reflectors with diameters in the range of 1 to 5 wavelengths are examined. It is found that the method of moments (MM) and the physical optics approximation (PO) are in close agreement in the radiation case, even for reflector diameters as small as lλ. This assumed that the reflector is in the far-field of an ideal feed (no blockage). Additional gain calculations using the feed near-field terms were not substantially different than the physical optics result, at least for feed diameters as large as the reflector radius. For plane wave scattering the agreement is not as good, but the physical optics result is still within a few dB of the method of moments. Neither the MM or PO data revealed significant resonances for these small reflectors when they were illuminated by ideal focal point feeds.
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Jenn et al. (1995) studied this question.
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