Numerical Methods for the Electromagnetic Modeling of Microstrip Antennas and Feed Systems
Tanner, David Robert
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https://hdl.handle.net/2142/69390
Description
Title
Numerical Methods for the Electromagnetic Modeling of Microstrip Antennas and Feed Systems
Author(s)
Tanner, David Robert
Issue Date
1988
Doctoral Committee Chair(s)
Mayes, Paul E.
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Abstract
The importance of low-cost printed circuit antennas has brought about a continued effort to improve and simplify the analysis of multilayered or stratified media. This thesis derives the dyadic Green functions for the electromagnetic fields in a multilayered medium and shows their relationship to the more familiar Green functions for ordinary transmission lines. This approach simplifies the analysis and allows the treatment of an arbitrary number of layers with a minimal increase in effort.
The theory is applied to the analysis of a microstrip antenna fed by a slot line. This configuration is an attractive element for use in active integrated arrays. This new hybrid technology attempts to incorporate active devices such as amplifiers and phase shifters with printed "microstrip" antennas into a single monolithic package. The boundary value problem for the antenna is analyzed in terms of the integral equations for the equivalent electric currents on the patch and magnetic currents representing the slot line. The integral equations are discretized by Galerkin's method and solved on the computer. Techniques designed to enhance the convergence of the spectral domain integrals are described. Important antenna parameters such as the input reflection coefficient are extracted from the solution of the boundary value problem. The problem concerning definition of antenna impedance (which is nonunique) can be avoided by using this technique. Finally, a method for obtaining automated measurements of the antenna reflection coefficient in the guide of interest is developed. Measurements of the reflection coefficient in a slot line feeding a microstrip patch are compared with computer-generated results of the theory.
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