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 Journal of the Korean Institute of Electromagnetic and Science 2001;1(1):63-66.
 Efficient Derivation of Closed-Form Greens Functions for a Microstrip Structure Byoung-Hee Oh1, Eui-Joong Kim1, Young-Soon Lee1, Young-Ki2 1Department of Electronic Engineering, Kum-oh National University fo Tech2Department of Electronics, Kyungpook National University Abstract In order to derive simple and accurate closed-form spatial Greep’s functions for the thick microstrip substrate, an efficient method based on the two-level approach, which circumvents the burdensome steps (i.e., without necessity of extraction of quasi-static contributions and subsequent determination of approximation parameters) in the previous complex image method, is considered in conjunction with the use of the original Pronys method. The present method is observed to give more accurate results for the evaluation of the Green`s functions over wider frequency range independently of the source-to-field distances than the previous method. Key words: open microstrip structure, complex images, two-level approach

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