Date of Award

12-1990

Document Type

Thesis

Degree Name

Master of Science in Electrical Engineering

Department

Department of Electrical and Computer Engineering

First Advisor

Harry Barksdale, Major, USAF

Abstract

The numerical approximations of the Green's functions for a theoretical model of an aperture fed stacked patch microstrip antenna are presented. The Green's functions approximated are those developed by Nazar (AFIT Thesis GE-89D-37), Green's Functions for a Theoretical Model of an Aperture Fed Stacked-Patch Microstrip Antenna. Each complex valued Green's function was written as a function of the source-observer separation. The behavior of each Green's function was analyzed, and it was found that they could all be approximated by three separate functions. The approximating functions were either polynomials or rational functions composed of polynomials. One component could be approximated by a single function over the entire range of radial separations, while the other required a piecewise approximation over the same intervals for each function approximated. The coefficients of the functions were determined by using a least squares curve fitting method and were used in a separate effort to perform a moment method analysis of he antenna. Custom written FORTRAN code was developed to determine the coefficients of the approximations. Example results for several of the Green's functions approximated are presented in this thesis. The agreement between the approximations and the original functions was excellent.

AFIT Designator

AFIT-GE-ENG-90D-19

DTIC Accession Number

ADA230702

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