A simplified expression on the radiation characteristics of small spherical helix antennas

Keisuke Fujita
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Abstract

Radiation characteristics including the radiation efficiency have been obtained for small spherical surface antennas by using the spherical wave expansion. Analytical expressions of the radiation efficiency revealed its theoretical limit [1] . Spherical helix antennas are proposed to approach the upper bound of the radiation efficiency. This antenna is composed of helical wires whose direction is along the optimized surface current of the spherical surface antenna. It is known that the radiation efficiency of a spherical helix antenna is always smaller than that of a spherical surface antenna. A method to predict the reduction of the radiation efficiency remains unclear. Here the radiation efficiency of spherical helix antennas is obtained analytically by modifying a result of the spherical surface antenna.
小型球形螺旋天线辐射特性的简化表达式
利用球面波展开法得到了小型球面天线的辐射特性,包括辐射效率。辐射效率的解析表达式揭示了它的理论极限[1]。提出了一种接近辐射效率上界的球面螺旋天线。该天线由沿球面天线优化表面电流方向的螺旋导线组成。众所周知,球面螺旋天线的辐射效率总是小于球面天线的辐射效率。预测辐射效率降低的方法尚不清楚。本文通过对球面天线的结果进行修正,解析得到了球面螺旋天线的辐射效率。
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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