Loop antenna with a branch wire for circular polarization
Loop antenna with a branch wire for circular polarization
复制标题
带有圆极化分支线的环形天线
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
S. Yokokawa
中科院分区：
文献类型：
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作者：
Takashi Nakamura;S. Yokokawa
本文分析和设计了一种由环形天线和适当长度的分支导线组成的圆极化天线。开发这种天线的想法源于这样的事实，即分支导线具有与环形导体耦合的传输线的特性。本结构是一个简单的单馈天线等效操作作为一个两点馈电环天线。将天线中的电流分布分解为平衡模式和非平衡模式，导出了天线的等效电路和等效环形天线。从等效环形天线出发，得到了圆极化的条件。基于此条件，设计了一种圆极化天线，并获得了轴比等各种特性。根据这些特性，发现存在这样的结构，其轴比可以比具有大约一个波长的长度的其它天线更宽。理论的正确性得到了实验的证实。
This paper reports on the analysis and design of a circularly polarized antenna consisting of a loop antenna with a branch wire of an appropriate length. The idea for developing this antenna derives from the fact that the branch wire has a characteristic as a transmission line coupled with a loop conductor. The present structure is a simple single-feed antenna operating equivalently as a two-point feed-loop antenna. The current distribution in the antenna is decomposed to the balanced and unbalanced modes for which the equivalent circuit and equivalent loop antenna have been derived. The condition for circular polarization has been obtained from the equivalent loop antenna. Based on this condition, a circularly polarized antenna has been designed and various characteristics such as the axial ratio have been obtained. From these characteristics it is found that a structure exists for which the axial ratio can be made much more broadband than other antennas with the length of about one wavelength. The validity of the theory has been confirmed by experiments.