Importance

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Abstract

A simple continuous metal pattern in a single plane is suspended in a waveguide filled with dielectric material. Two conductive pins penetrate the backshort of the waveguide in an axial direction and are connected at corresponding locations at opposite sides of the metal pattern. The metal pattern forms a radiating element in the shape of a continuous ring, having two convex (with reference to the central axis of the waveguide) primary antenna segments, each of which has one end joined to the corresponding end of the other segment by a narrow bridge segment. The opposite ends of the primary antenna segments extend generally away from each other and are joined by a narrow feedback segment. Within a desired frequency range of operation, the continuous metal pattern is excitable to produce both dominant orthogonal modes of circular polarization with the 90 degree phase difference and in both RHCP and LHCP orientation. More specifically, a modulated electrical signal supplied at one pin results in propagation of an RHCP signal from the waveguide, whereas a modulated electrical signal applied at the other pin results in propagation of an LHCP signal from the waveguide.

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First Claim