A leaky-wave antenna using an artificial dielectric medium

Author

Bahl, I.J. ; Gupta, K.C.

Author_Institution

Indian Institute Technology, Kanpur, India

Volume

22

Issue

1

fYear

1974

fDate

1/1/1974 12:00:00 AM

Firstpage

119

Lastpage

122

Abstract

A narrow-beam antenna using an artificial dielectric medium with effective permittivity less than unity has been investigated theoretically and experimentally. Complex propagation constant for a wave propagating along the structure is evaluated by solving the dispersion relation. The analysis indicates the presence of a leaky-wave mode. The radiation pattern is calculated by using Kirchhoff-Huygens integration method. Experimental results for an antenna of this type designed for operation at $X$ band are reported and compared with theoretical calculations. Beam position varies from $17\\deg$ to $47\\deg$ when the frequency is changed from 8.6 to 11.5 GHz. Over this frequency range the half-power beamwidth varies from $5.6\\deg$ to $4.8\\deg$ . An expression for the half-power beamwidth of a leakywave antenna of finite length has been derived and discussed in the Appendix.

Keywords

Artificial dielectric materials/devices; Leaky-wave antennas; Antennas and propagation; Dielectrics; Dispersion; Frequency; Geometry; Leaky wave antennas; Propagation constant; Refractive index; Tellurium; Wires;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.1974.1140715

Filename

1140715