Abstract
A highly efficient circular aperture multimode monopulse feed is proposed. TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> and TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> modes in the circular waveguide are added in a circular waveguide TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">21</sub> mode dual-channel monopulse feed. Optimal mode ratios (both amplitude and phase) are realized conveniently to cancel the crosspolarization of the difference modes on the feed's aperture, which changes a low-efficient funnel-shaped difference beam to an azimuth or elevation difference beam with the efficiency of which highly improved. The fundamental HE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> mode of the corrugated waveguide is adopted as the sum mode. The simulation and measured results show that this feed is of low voltage standing-wave ratio, high sum-difference isolation, high transmitter-receiver isolation, high efficiency, and broadband.
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