00788598IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 47, NO. 9, SEPTEMBER 19991589Unied Equivalent-Circuit Model of Planar Discontinuities Suitable for Field Theory-Based CAD and Optimization of M(H)MIC’sLei Zhu, Member, IEEE, and Ke Wu, Senior Member, IEEEAbstract― Unied dynamic equivalent-circuit model for characterizing planar unbounded discontinuities is reported for use in the eld-theory-based computer-aided design and optimization of high-frequency integrated circuits and structures such as monolithic and hybrid microwave integrated circuits (M(H)MIC’s). The proposal of the circuit model is stemmed from a new scheme called the short-open calibration (SOC) technique. This SOC technique is directly accommodated in a full-wave method-ofmoments (MoM) algorithm. The developed ……