Technical memorandum: Quasistatic and hybrid-mode analysis of shielded coplanar waveguide with thick metal coating

Abstract
A unified approach is presented to give the quasistatic and hybrid-mode solutions of the shielded coplanar waveguide (CPW) with a uniaxially anisotropic substrate. The quasistatic formulation is based on the variational method and the stationary expression of the line capacitance of the shielded CPW is derived for the first time. The present method takes the metallisation thickness into consideration and it presents accurate numerical values both for the quasistatic and frequency-dependent hybrid-mode solutions. The frequency-dependent characteristic impedances based on various definitions are investigated.

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