Derivation of Closed-Form Green’s Functions for a General Microstrip Geometry

Date
1992
Authors
Aksun, M.I.
Mittra, R.
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Source Title
IEEE Transactions on Microwave Theory and Techniques
Print ISSN
189480
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Volume
40
Issue
11
Pages
2055 - 2062
Language
English
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Abstract

The derivation of the closed-form spatial domain Green’s functions for the vector and scalar potentials is presented for a microstrip geometry with a substrate and a super-state, whose thicknesses can be arbitrary. The spatial domain Green’s functions for printed circuits are typically expressed as Sommerfeld integrals, that are inverse Hankel transform of the corresponding spectral domain Green’s functions, and are quite time-consuming to evaluate. Closed-form representations of these Green’s functions in the spatial domains can only be obtained if the integrands are approximated by a linear combination of functions that are analytically integrable. In this paper, we show we can accomplish this by approximating the spectral domain Green’s functions in terms of complex exponentials by using the least square Prony’s method. © 1992 IEEE

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