Skip to main content

Cross polarisation of electromagnetic waves transmitted through waveguide dichroic plates

Langsford, P.A., Parker, Edward A. (1981) Cross polarisation of electromagnetic waves transmitted through waveguide dichroic plates. IEE Proc. Microwaves, Optics and Antennas, 128 (1). pp. 1-5. ISSN 0143-7097. (doi:10.1049/ip-h-1:19810001) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:38760)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1049/ip-h-1:19810001

Abstract

Dichroic or frequency-sensitive surfaces modify the cross-polar performance of feeds transmitting through them. In the paper we investigate the influence of two flat waveguide dichroic plates 1 cm thick and 15 cm in diameter, placed 4 cm in front of a simple, linearly-polarised, choked waveguide feed. Measured cross-polar levels, mainly in the 45° planes, are compared with the levels predicted by a modal analysis in the frequency range 19¿26 GHz. The results agree well. With these particular plates the cross-polar levels over most of the frequency range are lower when the guides are arranged on a close-packed equilateral triangular lattice than when on the more-symmetrical square lattice. Ten wave guide modes are included in the analysis, and their relative importance is discussed. Two cumulative radiation patterns are illustrated, comparing the development of the farfield radiation patterns for the two lattices as the contributions of successive guide modes are summed.

Item Type: Article
DOI/Identification number: 10.1049/ip-h-1:19810001
Subjects: T Technology
Divisions: Faculties > Sciences > School of Engineering and Digital Arts
Depositing User: Ted Parker
Date Deposited: 14 Mar 2014 09:14 UTC
Last Modified: 29 May 2019 11:59 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/38760 (The current URI for this page, for reference purposes)
  • Depositors only (login required):