Transitional section cone angle design of EMP simulator

Electric field waveform in the simulator working region was calculated using the moment method and fast multipole method. The relationship between transitional section structure and EMP waveform was studied. And the optimum cone angles of transitional section of EMP simulator were designed. The results indicate that the front and back transitional sections will both evoke the electric field along the transmitting direction. The front transitional section puts influence mainly on the rising time of field waveform in working region. When the front cone angle becomes smaller, the rising time of waveform first decreases and then increases slowly. While the back transitional section puts influence mainly on the decline portion of waveform, it makes decline portion of waveform produce much more