Weakly singular surface integral equations for microstrip discontinuities and nonregular structure applications

An original technique reducing the kernel singularities of surface impedance and admittance equations have been developed and new types of surface integral equations with integrable kernels have been introduced. The new equations are based on the representation of surface vector functions through two scalar potentials using the Green´s formulas, or on the inverse operator-function implementation. The numerical results for microstrip resonators, for dispersion characteristics of microstrip lines and for microstrip open end are presented.