[天线]74 Three Coaxial-feed Axial Mode Spherical Helical Antennas

Three Coaxial-feed Axial Mode Spherical Helical Antennas n "?It  
Xia Dongyu, Zhang Hou, Zhang Qianyue, Wang Chong ,PC'xrEo  
Missile Institute, Air Force Engineering University, Sanyuan, Shanxi 713800, China IlQNo 1  
E-mail: xiady007@163.com Syv[[Ek  
Abstract: 5p!X}u]  
Characteristics of three coaxial-feed axial U$jw8I'.  
mode spherical helical antennas are ?}|l )  
analyzed by the moment method. The results "zFv?ay  
indicate that gains of the one-arm spherical `
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helical antenna and the hemispherical helical M &`ZF  
antenna vary acutely in the frequency band !wP|t#Sc9  
and their main beams float from the axial +@*}_%^l"  
direction when the frequency higher than -5;Kyio  
1600MHz. The two-arm hemispherical [P~6
O>a5p  
helical antenna has more than 100% pattern JHQc)@E}  
bandwidth and impedance bandwidth, and GZJIIP#  
its gain bandwidth is ~93% and the peak |^!#x Tj  
gain is 10.7dB, which shows that it is of ]gHxvT\E  
great potential value in broadba .. "9F]Wv/  
T}')QC&wQ  

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