The planar dual-polarized cavity backed sinuous antenna - a design summary

J. Cloete, T. Sickel
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引用次数: 10

Abstract

DuHamel's dual-polarized cavity-backed sinuous antenna was a remarkable invention, which is now widely used in RWR, DF and ELINT systems. The physical principles of especially the four-arm planar sinuous are well understood, including its interaction with the absorbing cavity that is used to achieve essentially frequency independent input impedance and unidirectional radiation patterns over multi-octave bandwidths. The absorber loaded cavity reduces the efficiency of the equivalent bi-directional free-space planar sinuous by around 50%, which is usually acceptable for EW receivers but not in low-noise applications like radio-astronomy where absorbing materials cause havoc with noise-temperature.
平面双极化腔背弯曲天线设计综述
DuHamel的双极化腔背正弦天线是一项了不起的发明,现已广泛应用于RWR、DF和ELINT系统中。特别是四臂平面曲线的物理原理已经被很好地理解,包括它与吸收腔的相互作用,吸收腔用于实现基本上与频率无关的输入阻抗和多倍频带宽上的单向辐射模式。吸收器负载腔将等效双向自由空间平面弯曲的效率降低了约50%,这对于电子战接收器通常是可以接受的,但在射电天文学等低噪声应用中则不行,因为吸收材料会对噪声温度造成严重破坏。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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