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Efficient electromagnetic modeling of microstrip structures in multilayer media

This paper presents an efficient method of moments solution of the mixed potential integral equation formulation for a general microstrip structure in a multilayer medium. The spectral domain Green's functions for multilayer media are derived and the spatial domain Green's functions in the form of Sommerfeld integrals are then evaluated by the discrete complex image method. The asymptotic waveform evaluation is applied to efficiently evaluate the frequency response over a band of interest. Numerical results have demonstrated the efficiency and accuracy of this method.