Triangular ray-tube analysis of dielectric lens antennas

Author

Chan, Kwok Kee ; Rao, Sudhakar K. ; Morin, Gilbert A. ; Tang, Minh Q.

Author_Institution

Chan Technol. Inc., Kirkland, Que., Canada

Volume

45

Issue

8

fYear

1997

fDate

8/1/1997 12:00:00 AM

Firstpage

1277

Lastpage

1285

Abstract

A new method of analysis for the radiation characteristics of dielectric lens antennas with arbitrary inner and outer surfaces is presented. The analysis is based on representing the feed illumination by a contiguous set of ray tubes and including the effects of surface reflections and ray divergence. Radiation patterns and the antenna gain are then computed by evaluating the closed-form expressions developed for the Kirchhoff´s integral of the aperture fields. The validity of the analysis method has been demonstrated by comparing the computations with measured results of two different spherical lenses and a shaped lens configurations. The analysis method presented takes into account some of the practical aspects associated with lens design such as surface zoning to reduce the mass and surface matching to minimize the reflection loss

Keywords

antenna feeds; antenna radiation patterns; dielectric devices; electromagnetic fields; electromagnetic wave reflection; integral equations; lens antennas; Kirchhoff´s integral; antenna gain; aperture fields; closed-form expressions; dielectric lens antennas; feed illumination; lens design; measured results; radiation characteristics; radiation patterns; ray divergence; reflection loss; shaped lens configuration; spherical lenses; surface matching; surface reflections; surface zoning; triangular ray-tube analysis; Antenna measurements; Antenna radiation patterns; Aperture antennas; Closed-form solution; Dielectrics; Feeds; Lenses; Lighting; Reflection; Shape measurement;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.611248

Filename

611248