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螺旋是一种表面波天线。无限结构的网络模型为研究场性能提供了一个简单的机构。本文详细地研究远场极化特性,并说明这些极化特性怎样取决于表面波结构和开口端与馈电端的配置。通过适当布置天线终端,就能产生理想的端射极化纯度,而与天线长度(即圈数)无关。装有介质芯,能降低偏轴方向的交叉极化辐射。理论方向图和实验方向图可以说明这些结果。
Spiral is a surface wave antenna. An infinitely structured network model provides a simple mechanism for studying field performance. This article examines far-field polarization characteristics in detail and shows how these polarization characteristics depend on the surface-wave structure and the configuration of the open and feed terminals. By proper placement of the antenna termination, it is possible to produce the ideal end-emission polarization purity regardless of the antenna length (ie the number of turns). Equipped with a dielectric core, can reduce cross-polarized radiation in the direction of off-axis. The theoretical and experimental patterns illustrate these results.