Application of Scattering Parameters in Source Waveform Reconstruction of Bounded Wave Simulator

In the simulation of electric fields and coupling responses within a bounded wave electromagnetic pulse simulator, obtaining accurate waveforms for high-voltage source excitation proves challenging. Field test waveforms are usually used to replace the source excitation waveforms in the simulation environment, which can cause significant errors between actual simulation results and experimental results. A method to quickly derive excitation signal waveform parameters for the electromagnetic pulse simulator by utilizing the measured coupling current of the antenna in the bounded wave simulator is introduced in this study. The proposed approach involves treating the test environment, including the antenna, as a two-port network in which the input side of this network represents the high-voltage pulse source of the electromagnetic pulse simulator, while the output is connected to the standard load. Subsequently, the transfer function between the voltage of the high-voltage pulse source and the coupling current on the load is calculated. By considering the waveform parameters of the high-voltage pulse source as optimization variables and comparing coupling current waveforms obtained through actual measurement with those derived from the transfer function, the waveform parameters of the high-voltage pulse source are determined through optimization. To validate the effectiveness of the proposed method, tests and simulations were implemented on a shortwave antenna. The obtained test data aligned with simulation results, confirming the effectiveness of the approach.