A general conformal-mapping approach to the optimum electrode design of coplanar waveguides with arbitrary cross section

The Schwarz-Christoffel toolbox, a free MATLAB package for the computation of conformal maps, is applied to the quasi-static analysis of coplanar wave guides (CPWs) of arbitrary cross section in order to provide computationall y efficient and very accurate estimates of their capacitance, inductance, c haracteristic impedance, and skin-effect attenuation. A few examples of man y-sided polygonal waveguides are discussed, and the trapezoidal CPW, import ant, for example, for electrooptic modulators, is described in full detail, providing general guidelines for the electrode geometry optimization. The technique is validated through a comparison with the results of a full-wave finite-element method, and excellent agreement is demonstrated both in vac uo and with two-layer dielectric substrates.