- CPW.analyse_quasi_static(ep_r, w, s, h, t, has_metal_backside)¶
This function calculates the quasi-static impedance of a coplanar waveguide line, the value of the effective permittivity as per filling factor, and the effective width due to the finite conductor thickness for the given coplanar waveguide line and substrate properties. Model from [#]_ with air backside and [#]_ with a metal backside. The models are corrected to account for strip thickness using a first-order approach described in [GGBB96]. ADS simulator report to use a custom correction based on [Cohn60]. This second method is not implemented in skrf.
G. Ghione and C. Naldi. “Analytical Formulas for Coplanar Lines in Hybrid and Monolithic MICs”, Electronics Letters, Vol. 20, No. 4, February 16, 1984, pp. 179-181.
G. Ghione and C. Naldi. “Parameters of Coplanar Waveguides with Lower Common Planes”, Electronics Letters, Vol. 19, No. 18, September 1, 1983, pp. 734-735.
S. B. Cohn, “Thickness Corrections for Capacitive obstacles and Strip Conductors”, IRE Trans. on Microwave Theory and Techniques, Vol. MTT-8, November 1960, pp. 638-644.
K. C. Gupta, R. Garg, I. J. Bahl, and P. Bhartia, Microstrip Lines and Slotlines, 2nd ed.Artech House, Inc., 1996.