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

Fast, accurate, and simple closed-form expressions are presented for calcul ating the quasistatic TEM parameters of asymmetrical coplanar waveguides (A CPWs) with finite and different ground planes. The effect of the ground-pla ne width and the asymmetry in the ground-plane widths and in the spacings o f ACPWs on the line parameters is investigated by using the formulas derive d by conformal mapping techniques. Comparisons are also made between the pr esent results and the results available in the literature for both the conv entional coplanar waveguide (CPW) and the ACPW. The results in this article are in very good agreement with the results derived by the conformal mappi ng technique, by the variational formulation, and by the spectral-domain me thod. It has been shown that the asymmetry of both ground planes and spacin gs leads to a significant change of the quasi-TEM parameters with respect t o cases of the finite and infinite ground planes. (C) 2000 John Wiley & Son s, Inc.