Abstract — Microwave and millimeter-wave systems have generally been developed from a circuit perspective with the effect of the electromagnetic environment modeled using lumped elements or N-port scattering parameters. The recent development of the local reference node concept coupled with steady-state and transient analyses using state variables, allows the incorporation of unrestrained electromagnetic modeling of microwave structures in a circuit simulator. A strategy implementing global modeling of electrically large microwave systems using the circuit abstraction is presented. This is applied to the modeling of a quasioptical power combining amplifier. Index Terms — Microwave circuits, circuit field interaction, electromagnetic analysis, global modeling, method of moments, nonlinear analysis, circuit theory I
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