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The analysis of microstrip circuits via integral equation techniques has proven as the most efficient, and yet rigorous and full-wave, approach. Nonetheless, the latter requires the evaluation of the impedance matrix which elements, in turn, are generally obtained after a two-dimensional numerical integration. We introduce a coordinate transformation allowing to reduce for the mixed potential integral equation, the numerical integration to a one-dimensional case. Moreover, by using the spatial domain closed-form of the Green's function and by phenomenologically separating the relevant contributions, we demonstrate that a significant reduction of computer times is indeed feasible and achievable.