Abstract
This paper presents a design method of coplanar waveguide formed on a printed circuit board. Fields in the waveguide are analyzed by assuming propagation of the TEM mode and solving Laplace's equation by means of the successive over-relaxation method. From the results of the analysis, line parameters of the coplanar waveguide such as characteristic impedance, wavelength, phase velocity, conductor loss, and dielectric loss are calculated, and presented as functions of the guide dimensions and electrical properties of the dielectric substrate used. As an example, a transmission line with a characteristic impedance of 75Ω is designed by the proposed method, and the transmission losses are evaluated. Also, a coplanar type, quarter-wavelength resonator operating at 7.00 GHz is designed using the same method.
