Effect of fabrication imperfections for ground-plane-backed dielectric-resonator antennas

Author

Junker, G.P. ; Kishk, Ahmed A. ; Glisson, A.W. ; Kajfez, Darko

Author_Institution

Dept. of Electr. Eng., Mississippi Univ., MS, USA

Volume

37

Issue

1

fYear

1995

fDate

2/1/1995 12:00:00 AM

Firstpage

40

Lastpage

47

Abstract

Results of numerical and experimental studies, pertaining to the effect of imperfections such as surface roughness, which could lead to poor mechanical contact between a dielectric resonator and the conducting surfaces on which it resides, are presented. This work simulates the poor-contact effect by introducing air gaps between the dielectric resonator (DR) and the adjacent conducting surfaces. Results are presented which illustrate the effect of air gaps upon the input impedance and resonant frequency of cylindrical-DR antennas, operating in the TM₀₁ and HEM₁₁ modes. Also presented are preliminary results pertaining to the validity of the thin-wire-theory approximation that is used in numerical electromagnetic design codes, to model the coaxial-feed probes, and results pertaining to the effect of an infinite-ground-plane assumption

Keywords

air gaps; antenna feeds; antenna testing; dielectric resonators; mechanical contact; microwave antennas; HEM₁₁ mode; TM₀₁ mode; air gaps; coaxial-feed probes; conducting surfaces; cylindrical-DR antennas; dielectric resonator; dielectric-resonator antennas; experimental studies; fabrication imperfections; ground-plane-backed antennas; infinite ground plane; input impedance; mechanical contact; numerical electromagnetic design codes; numerical studies; poor-contact effect; resonant frequency; surface roughness; thin-wire-theory approximation; Air gaps; Coaxial components; Dielectric resonator antennas; Electromagnetic modeling; Fabrication; Probes; Resonant frequency; Rough surfaces; Surface impedance; Surface roughness;

fLanguage

English

Journal_Title

Antennas and Propagation Magazine, IEEE

Publisher

ieee

ISSN

1045-9243

Type

jour

DOI

10.1109/74.370580

Filename

370580