APERATURE BLOCKING OF THE HIGH-FREQUENCY LUNEBERG LENS BY A SEMICIRCULAR GRATING OF MONOPOLE FEEDS.
STANFORD RESEARCH INST MENLO PARK CALIF
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The wire-mesh high-frequency modified Luneberg lens has numerous possibilities of application, among which are direction finding and azimuthal scanning with step-frequency ionospheric sounders. In these applications, where close feed spacing is desirable, numerous questions arise regarding the effect of the placement of feeds in the antenna aperture upon the lens radiation pattern in the absence of feeds. This paper describes an initial attempt to answer some of these questions. A geometrical configuration of feeds equally spaced around the periphery of the lens and the perturbing effect of this feed grating upon the lens radiation pattern without the feeds is considered.
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