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In recent work equivalent circuit elements based on the scattering (S) parameters of a microstrip via hole calculated using the finite difference time domain (FDTD) method have been optimised. Now the authors use the integral form of the full wave/finite difference frequency domain (FDFD) method incorporating losses to fit measured values for the via. For a triplate via structure a four element equivalent circuit is proposed, whose values are fitted up to 18 GHz for excellent S-parameter agreement with FDFD results.
Date of Publication: 27 May 1993