Analysis of thin multioctave cavity-backed slot spiral antennas Article

Ozdemir, T, Volakis, JL, Nurnberger, MW. (1999). Analysis of thin multioctave cavity-backed slot spiral antennas . IET Microwaves, Antennas and Propagation, 146(6), 447-453. 10.1049/ip-map:19990429

cited authors

  • Ozdemir, T; Volakis, JL; Nurnberger, MW

authors

abstract

  • 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 0.8cm (0.33in) thick and 24cm (9in) wide antenna can provide circular polarisation over a nearly 4:1 bandwidth. ©IEEJ999 DOI: 10.1W9/ip-map:I999W29.

publication date

  • January 1, 1999

published in

Digital Object Identifier (DOI)

start page

  • 447

end page

  • 453

volume

  • 146

issue

  • 6