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Analysis of thin multioctave cavity-backed slot spiral antennas

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3 Author(s)
Ozdemir, T. ; Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA ; Volakis, J.L. ; Nurnberger, M.W.

Thin cavity-backed Archimedean slot spirals are analysed through an efficient implementation of the finite element method. Through numerical analysis, fundamental differences between the free-space and cavity-backed configurations are identified. The bandwidth limitation imposed by the presence of the cavity is remedied by terminating the spiral slot with tapered resistive loading and employing larger apertures. Design improvements are presented based on the interpretation of the numerical simulations. It is shown that a 0.8 cm (0.33 in) thick and 24 cm (9 in) wide antenna can provide circular polarisation over a nearly 4:1 bandwidth

Published in:

Microwaves, Antennas and Propagation, IEE Proceedings  (Volume:146 ,  Issue: 6 )

Date of Publication:

Dec 1999

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