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IEEE Transactions on Antennas and Propagation
Volume 46 Number 9, September 1998

Table of Contents for this issue

Complete paper in PDF format

Radiation and Scattering from Ferrite-Tuned Cavity-Backed Slot Antennas: Theory and Experiment

Anastasis C. Polycarpou, Student Member, IEEE, Constantine A. Balanis, Fellow, IEEE, James T. Aberle, Senior Member, IEEE, and Craig Birtcher

Page 1297.

Abstract:

A three-dimensional finite-element method hybrid-ized with the spectral/spatial domain method of moments is presented for the analysis of ferrite-tuned cavity-backed slot antennas. The cavity, which is partially filled with magnetized ferrite layers, is flush mounted on an infinite ground plane with possible dielectric or magnetic overlay. The antenna operates primarily in the ultrahigh-frequency band. The finite-element method is used to solve for the electric-field distribution inside the cavity, whereas the spectral-domain approach is used to solve for the exterior region. An asymptotic extraction of the exponential behavior of the Green's function followed by a spatial evaluation of the resulting integral is used to improve computational speed. Radar cross section, input impedance, return loss, gain, and efficiency of ferrite-tuned cavity-backed slots (CBS) are calculated for various biasing conditions. Numerical results are compared with experimental data.

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