Analysis of thin multioctave cavity-backed slot spiral antennas
- 1 January 1999
- journal article
- research article
- Published by Institution of Engineering and Technology (IET) in IEE Proceedings - Microwaves, Antennas and Propagation
- Vol. 146 (6) , 447-454
- https://doi.org/10.1049/ip-map:19990429
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 0.8 cm (0.33 in) thick and 24 cm (9 in) wide antenna can provide circular polarisation over a nearly 4:1 bandwidth.This publication has 2 references indexed in Scilit:
- A class of hybrid finite element methods for electromagnetics: a reviewJournal of Electromagnetic Waves and Applications, 1994
- Curved microstrip lines as compact wideband circularly polarised antennasIEE Journal on Microwaves, Optics and Acoustics, 1979