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Abstract
A generalized edge boundary condition (GEBC) relating the tangential magnetic field and the vertical electric field at the edge of an arbitrarily shaped microstrip patch on electrically thin substrate is developed. This boundary condition incorporates dynamical edge effects and coupling over the patch. Based on this boundary condition, commonly used microstrip patches can be accurately and efficiently analyzed. A perturbation approach yields simple expressions for the resonant frequencies and Q -factors of canonical patch shapes. Rectangular and circular microstrip patches are analyzed in detail and calculated results are compared with previously published theoretical and experimental results.