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Compact closed-form mathematical expressions are presented for the effective permittivity, characteristic impedance and attenuation constant of coplanar waveguides with thick electrodes and high-frequency dispersion. Excellent agreements, for a wide range of frequencies, up to 100 GHz and for conductor thicknesses up to 40 m are found with full-wave finite-element results from commercial software (HFSS) in a margin of geometric parameter values and frequencies of interest for the design and optimisation of high-speed electro-optical modulators. The formulae are simple and specially tailored to the narrow gap widths and thick electrodes typical of electro-optical modulator applications. Other approaches to closed-form formulae for CPW parameters are also compared and analysed.
CitacióIbarra, J.; Santos, M.; Rodríguez , E. Compact closed-form expressions for the propagation parameters of a finite ground width coplanar transmission waveguide with thick electrodes. "IET microwaves antennas and propagation", 21 Febrer 2012, vol. 6, núm. 3, p. 269-275.