Microstrip-based nanosecond pulse generators: Numerical and circuital modeling

In this paper a new compact type of nanosecond high voltage pulse generator, developed for innovative medical treatments, which combines microstrip line technology and microchip laser triggered photoconductive semiconductor switches (PCSS), has been numerically characterized. Two different modeling methodologies have been considered. The first is based on a full wave finite difference time domain (FDTD) analysis. The second approach proposes a circuit model of the generator solved through SPICE simulations. Further, considering the FDTD analysis an appropriate model for the PCSS has been developed. The presented results show a good agreement between the two modeling methodologies and first experimental measurements performed on a generator prototype. Therefore, these outcomes suggest the presented approaches as suitable modeling tools for the development of such kind of innovative devices.