,, .- ..-i. ., SENSOR AND SIMULATION NOTES Note 315 “ On the ‘1’hin Toroidal and Elliptical Antennas C. Zuffada F.C. Yang 1. Wong Kaman Sciences Corporation Dikewood Division/Santa Monica 2800 28th Street, Suite 370 Santa Monica, California 90405 January 1989 Abstract _f!~ccurrent along the thin toroidal and elliptical antennas and the electromagnetic fields at and .::our]d their center have been derived using the asymptotic antenna theory. Frequency and time ?I)rnain ~a]cu]ation~ are presented. Both cases of a &-gap generator and of a distributed source with the field configuration ofa biconical wave launcher have been considered. The field uniformity in the” ‘~~rkin~ volume has been calculated as a function of frequency, for different geometrical . :Urlfigurations. For the case of the elliptical geometry, parametric studies to analyze the dependence ~fthc fic]d be}lavior on source ]Ocation and value of the loading resistance, eccentricity and wire thickness Ilave been performed. Acknowledgement ‘;ork Performed for AIR FORCE WEAPONS LABORATORY, NTAAT, under contract F29601-88-C- ‘~027.The ~luthors wish to thank c.~. Daum Capt. T. Smith and hlr. W. Prather fOr their interes~ ~l:d manv he~pful discussions. .- > ....,: ....zyxwvutsrqpo -“, ,. ..,. .... . . .. . .. .: ‘-,. I “-. 1