Abstract

Characteristic mode (CM) theory for modal analysis of microstrip antennas is developed in this paper. It is derived from the mixed-potential integral equation (MPIE) with spatial domain Green's functions for multilayered media, where the spatial domain Green's functions take into account the effect of the multilayered media. Numerical results are presented to confirm its effectiveness and accuracy in determining the resonant frequencies, radiating mode currents, and modal fields of microstrip antennas. As opposed to the very popular CM formulation for perfectly electrical conducting bodies, comparative studies are presented to show the quite different modal analysis results by considering the multilayered media.

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