[天线]69 A spherical helical antenna

A SPHWCAL. HELICAL A " N A W(4$.uZ)  
J.C. Cardoso* and A. Safaai-Jazi v#<
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The Bradley -nt of Electrical Engineering yJ0%6],^g  
Virginia Polytechnic Institute and S m University dKU:\y  
Blz&sburg.Vuginia 24061-0111 N81M9#,["~  
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Abstract: A spherical helical antenna is proposed and its radiation characteristics are analyzed H<<t^,E^.t  
using numerical methods and experimental measurements. The analysis has shown that the N3MPW  
sphaica) helix is, in general, a broad-buun radiator and operates ova a relatively wide bandwidth. 4E2/?3D  
Results are highlighted for a ten-turn helix which, under certain conditions, can provide circular -{9mctt/gE  
polarization over a wide beamwidth. =&9c5"V&  
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Introduction: Helical antennas are of considerable interest because they provide circular mXS]SE  
polarization over a wide bandwidth. The conventional cylindrical helix has been investigated a8ouk7G  
extensively in the past by many -em. and numerous modifications to the simple cylindrical )s,tBU+N  
geometry have been proposed in the pursuit of increased bandwidth and optimization of other R4JfH  
parameters.1-3 ~nth is summary, we repart preliminary e t so f.an investi on on asphericul mv~?1aIKD  
helical untennu. The spherical helix is a wire antenna in a heh shape E is wound over a WvfM.D!  
spherical surface as shown in Fig. I. It is f .. w{2CV\^>5  
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