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Title: Characterization of Microstrip Discontinuities by a Dynamic Source Reversal Technique Using Potential Theory
Author : Stanley Slavko Toncich
Release Date : January 24, 2013
Genre: Computers,Books,Computers & Internet,
Pages : * pages
Size : 14534 KB

Description

This thesis presents the dynamic source reversal technique based on potential theory, for the full wave characterization of microstrip discontinuities. The technique is used to characterize open ends and asymmetrical gaps in microstrip. The discontinuity to be analysed is enclosed in a waveguide whose dimensions are chosen such that the guide is cut off at the propagating frequency of the microstrip. The substrate is assumed lossless and isotropic, and the microstrip has zero thickness. A complete set of sources are included in the analysis, the longitudinal and transverse current, as well as the charge on the line. The correct edge conditions are included. From these sources the scalar and vector potentials, Φ and A, respectively, are determined. The electric field in the waveguide can be determined from the potentials, and is expressed as an integral equation. The method of moments is used to reduce the integral equation to a matrix equation which can be solved for the unknown input admittance. In this technique, there is no need to model the source excitation, and the admittance for the discontinuity can be solved for directly in the case of an open end. For a gap, the tangent plane method is used to extract equivalent circuit values. The computer program that was developed to implement this technique can be executed on a personal computer with run times of three minutes for an open end and 15 minutes for a tightly coupled gap. Data generated by this technique are compared to that of several other investigators. The technique provides a clear improvement in program execution time while also providing very accurate representation of the physical sources on the microstrip discontinuity. Advisors/Committee Members: Collin, Robert E.