MICROSTRIP OPEN-END AND GAP DISCONTINUITIES INCLUDING ANISOTROPIC SUBSTRATES

A dynamic source reversal method, based on potential theory, is develo ped to determine the parameters of the equivalent circuit for capaciti ve gaps in microstrip lines with anisotropic substrates. The open circ uit end capacitance is found as a special case by letting the gap spac ing go to infinity. It is also shown that since the discontinuity Is e ssentially characterized by the excess charge in the vicinity of the g ap an equivalent problem with an isotropic substrate and an effective substrate thickness can be formulated that gives accurate results for the equivalent circuit capacitances.