Abstract: D’Alembert’s method is used to analyze the Photoconductive Switches transmission line. A total reflection border and the implementation of a new field source excitation for the finite-difference time-domain method are built to satisfy D’Alembert’s method. The electrical pulse generation and propagation by Photoconductive Switches (PCSS) microstrip line are simulated by the finite-difference time-domain method and the effect of Blumlein line geometrics on the pulse amplitude is acquired An ultra short bipolar pulse generator based PCSS is developed and analyzed. The good agreement of experimental results with the simulated values shows that D’Alembert’s method coupled with the finite-difference time-domain method could be used to study and accurately analyze the pulse circuit from the electromagnetic viewpoint.

Key words: D'Alembert's method, photoconductive switches, transmission line, FDTD, bipolar pulse