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

Three Coaxial-feed Axial Mode Spherical Helical Antennas b5v6Y:f&fK  
Xia Dongyu, Zhang Hou, Zhang Qianyue, Wang Chong $4j$c|S!  
Missile Institute, Air Force Engineering University, Sanyuan, Shanxi 713800, China ".=LzjE<gv  
E-mail: xiady007@163.com y_Tc$g~  
Abstract: 9*lkx#  
Characteristics of three coaxial-feed axial ^
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mode spherical helical antennas are 3>I  
analyzed by the moment method. The results rW&#Xw/a  
indicate that gains of the one-arm spherical %j*i=  
helical antenna and the hemispherical helical AHA4{Zu[  
antenna vary acutely in the frequency band Q:#Kt@W  
and their main beams float from the axial V&>\U?q:  
direction when the frequency higher than dU4G!  
1600MHz. The two-arm hemispherical ;& PK6G  
helical antenna has more than 100% pattern kQY+D1  
bandwidth and impedance bandwidth, and p>c`GDU  
its gain bandwidth is ~93% and the peak 8!c#XMHV  
gain is 10.7dB, which shows that it is of =:;KYuTr  
great potential value in broadba .. .;'3Roi  
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