The performance of an iris-loaded planar phased-array antenna of rectangular waveguides with an external dielectric sheet

Author

Van Schaik, H.J.

Author_Institution

TNO, The Hague, Netherlands

Volume

26

Issue

3

fYear

1978

fDate

5/1/1978 12:00:00 AM

Firstpage

413

Lastpage

419

Abstract

A new method for calculating the performance of an iris-loaded planar phased-array antenna of rectangular waveguides is presented. The method is based upon the expansion of the tangential electric aperture field in terms of judiciously chosen functions. Also, the influence of a dielectric sheet in front of an antenna the apertures of which are loaded with inductive irises is investigated. In the experiments, a sheet with a low relative permittivity ( $\\epsilon_{r} = 2.3$ or $\\epsilon_{r} = 3.5$ ) is spaced in front of a space-fed planar antenna of some 850 radiating elements, and the total transmitted power of the antenna is measured as a function of frequency and scan angle. The results indicate, that both in theory and in practice, an excellent match can be achieved with a polythene sheet ( $\\epsilon_{r} = 2.3$ ) or a Perspex sheet ( $\\epsilon_{r} = 3.5$ ).

Keywords

Dielectric-loaded antennas; Loaded antennas; Phased arrays; Planar arrays; Waveguide arrays; Antenna measurements; Aperture antennas; Dielectrics; Loaded antennas; Permittivity; Planar arrays; Planar waveguides; Rectangular waveguides; Transmitting antennas; Waveguide discontinuities;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.1978.1141860

Filename

1141860