Analysis of coplanar-coupled lines on a cylindrical substrate

CAD-oriented closed-form expressions are presented for calculating the quas istatic TEM parameters of coplanar-coupled lines on a cylindrical substrate . The effect of the curvature on the quasistatic parameters is discussed by using the formulas derived by the conformal mapping techniques. Comparison s have also been made between the present results and the results available in the literature for coplanar-coupled lines on a planar substrate. The re sults of this paper are in very good agreement with the results derived by the conformal mapping technique and the spectral-domain method for the plan ar one. (C) 2000 John Wiley & Sons, Inc.