Conformal mapping of the field and charge distributions in multilayered substrate CPW's

Conformal mapping (CM) and partial capacitance techniques are used for anal ytical evaluation of charge/current and electric- and magnetic-field distri butions in a multilayered substrate coplanar waveguide (CPW) in the quasi-T EN approximation, The results, compared with finite-element method simulati ons, show that the magnetic wall assumed at the dielectric/dielectric inter faces in CM is a good approximation for many practical cases. The method is applied to a CPW with a thin ferroelectric film used in tunable microwave devices.