Effect of finite ground-plane widths on quasistatic parameters of asymmetrical coplanar waveguides

CAD-oriented closed-form expressions are presented for calculating the quas istatic TEM parameters of asymmetrical coplanar waveguides (ACPWs) with fin ite ground planes. The effect of the ground-plane width on the quasistatic parameters has been investigated by using the formulas derived by the confo rmal mapping techniques. Comparisons have also been made between the presen t results and the results available in the literature for both the conventi onal coplanar waveguide (CPW) and ACPW. The results are in good agreement w ith the results derived by the conformal mapping technique and the spectral -domain method. It has been shown that the present expressions can also be used for calculating the quasistatic parameters of both symmetric and asymm etric CPW with finite and infinite ground planes.