兩種新型球面螺旋天線的數值分析
摘要：將平面等角螺旋天線投影到半球面和部分球面上，可得到兩種新型球面螺旋天線，采用基于曲線基函數的矩量法對其輻射特性進行了分析，給出了天線的駐波、增益、極化及方向圖等隨頻率變化的曲線。從二者輻射特性的分析結果可以看出，二者均具有寬帶、寬波束和圓極化特性，新型半球面螺旋天線的具有更寬的圓極化帶寬，部分球面螺旋天線具有較小尺寸的同時其頻帶內的增益曲線更加平坦，為不同要求下天線形式的選取提供了良好的依據。
關鍵詞：球面螺旋天線?? 矩量法?? 曲線基函數
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