Aperture antenna having the improved cross-polarization performance
AssigneeNippon Telegraph & Telephone Public Corporation
InventorsYoshihide Yamada, Takashi Yamada, Tadashi Takano
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Abstract
An aperture antenna having the improved phase performance of radiated co- and cross-polarization has been found. The present antenna has, at least, a horn for radiating an electro-magnetic wave, and means for focusing the electromagnetic wave. The focusing means is actually implemented by a reflector or a dielectric lens, and is designed so that the phase distribution of an electric field on an aperture plane of the focusing means has the period of .pi./2 and the maximum phase at (2m-1) .pi./8 from the reference plane of one polarized wave in the polar coordinates system on the aperture plane, where m is an integer.
Claims9
An aperture antenna having at least a single primary radiator for radiating an electro-magnetic wave, and focusing means for focusing the radiated electro-magnetic wave by the said primary radiator, wherein said focusing means is non-uniform in the circumferential direction such that the phase distribution of the electric field on an aperture plane of the antenna has the period of .pi./2 and the maximum phase deviation at (2m-1).pi./8 from the orientation plane of one polarization where m is an integer.
Dependencies are inferred from the claim text.