Simple and accurate formulas are presented for the synthesis of conductor-hacked coplanar waveguide (CPW). These formulas are derived by applying function approximation and curve-fitting technique to the respective quasi-static analysis results. The results obtained from these formulas are compared with the results of quasi-static analysis and experimental works available in the literature. Average percentage error is found to be better than 1% for 1086 conductor-backed CPW samples having different electrical parameters and geometrical dimensions. (C) 2008 Wiley Periodicals, Inc.