Equivalent circuits for microstrip gap discontinuities with metallisations of rectangular and trapezoidal cross sections

Microstrip gap discontinuities with finite thickness conducting strips of rectangular and trapezoidal cross-sections are analysed. The finite thickness strips are modelled as pairs of equipotential strips of negligible thickness placed at the top and bottom surfaces of the thick strips. The excess charge technique in the spectral domain is used to compute the quasistatic equivalent circuits of the analysed microstrip gap discontinuities.