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This paper suggests an improved Electromagnetic Topology (EMT) method, based on Harmonic Balance (HB), to analyze electromagnetic field coupling to nonlinear system. In the proposed method, EMT and HB communicate in real-time. The voltage results from the HB are imposed on the EMT as boundary conditions and the voltage results from EMT are used for computing linear and nonlinear currents in the HB. Voltage responses on a voltage doubler in a cavity were calculated. Measurement and simulation results agreed.