Patent ID: 7239285
Filing Date: 2007-07-03
Classification: H01Q

Abstract:
1. An antenna feed horn extending in a signal propagation direction, comprising: a reception end defined by an undivided, oblong input aperture; an output aperture spaced apart from the input aperture in the signal propagation direction; a phase adjustment structure extending from the input aperture to the output aperture comprising an interior surface defining an oblong, undivided cross-section perpendicular to the signal propagation direction over a substantial portion of the phase adjustment structure in the signal propagation direction; and for a signal propagating at a desired frequency and exhibiting circular polarity expressed by orthogonal linear components when incident at the input aperture, the interior surface of the phase adjustment structure configured to differentially phase shift the linear components by approximately 90 degrees to convert the signal from circular polarity to linearly polarity as the signal propagates through the phase adjustment structure.