Estimation of radiation losses from a tapered H-Guide: Application to the analysis of IDG antennas

A. B. Hannigan, S. R. Pennock, P. R. Shepherd

Research output: Contribution to journalConference articlepeer-review

1 Citation (SciVal)


Tapered Inset Dielectric Guide (IDG) antennas may be analyzed by modelling the IDG as H-Guide. This allows a reasonable estimate of the aperture fields to be obtained, from which the far-field radiation pattern of the antenna may be derived. In the past, theoretical methods for the analysis of tapered IDG antennas have included a simple amplitude multiplication factor, determined by trial-and-error, to cater for the effect of mode conversion along the IDG taper. This paper presents a method by which power transfer to other bound modes and to the radiation spectrum may be calculated. This method is based on the variable-bound mode matching approach of Brooke and Kharadly. The new technique allows the unsatisfactory empirical method used previously to be dispensed with. The power loss characteristics identified by this technique provide new insight into the structure, and have implications for future IDG antenna designs. Radiation patterns calculated using results from the bound mode matching method compare well with measured values, and demonstrate improvements upon predictions made by existing techniques.

Original languageEnglish
Pages (from-to)328-331
Number of pages4
JournalIEE Conference Publication
Issue number461
Publication statusPublished - 1 Jan 1999
EventProceedings of the 1999 IEE National Conference on Antennas and Propagation - York, UK
Duration: 31 Mar 19991 Apr 1999

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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