两种新型球面螺旋天线的数值分析

两种新型球面螺旋天线的数值分析
摘要：将平面等角螺旋天线投影到半球面和部分球面上，可得到两种新型球面螺旋天线，采用基于曲线基函数的矩量法对其辐射特性进行了分析，给出了天线的驻波、增益、极化及方向图等随频率变化的曲线。从二者辐射特性的分析结果可以看出，二者均具有宽带、宽波束和圆极化特性，新型半球面螺旋天线的具有更宽的圆极化带宽，部分球面螺旋天线具有较小尺寸的同时其频带内的增益曲线更加平坦，为不同要求下天线形式的选取提供了良好的依据。
关键词：球面螺旋天线   矩量法   曲线基函数
Numerical Analysis on Two Novel Spherical Helical Antennas
Zhang Hou1, Xia Dong-yu1, Qu Tian-ying2, Ren Wei-hua1
(1. The missile institute, air force engineering university, Sanyuan, Shanxi 713800, China)
(2. The No.2863 mail box, Beijing, 100085, China)
Abstract: Two novel spherical helical antennas can be designed by projecting the planar equiangular spiral antenna onto the surfaces of hemisphere and partial sphere. Their radiation properties are analyzed by the moment method with curved basic and testing function, and the curves of the VSWR, gain, polarization and pattern vs. frequency are also given, respectively. By compared with each other in the radiation property, it can be seen that the circular polarization band of the novel hemispherical helical antenna is broader and the gain curve of the partial spherical helical antenna is more even though its dimension is less small. These results provide dependable gists to the choice of antenna format according to the requirements.
Key words: spherical helical antenna   MOM   curved basic function