Analysis of a planar S-type folded pulse forming line for compact high-power pulsed source

A kind of planar S-type folded solid-state pulse forming line is designed using FR-4 epoxy glass fiber cloth as the dielectric material. The discharge process of the pulse forming line is analyzed theoretically and experimentally. The margin effect on its characteristic impedance is studied, and the modified characteristic impedance expression is given. The neighboring and skin effects on the pulse formation are also analyzed, which induce a super-imposition of high frequency noise on the original signal. The dependence of lifetime on the applied electric field is verified. Series-parallel and modular technology of multistage folded line is used to increase the withstanding voltage and reduce its characteristic impedance. A Blumlein line module based on series-parallel technology is designed, whose withstanding voltage of the module is greater than 120 kV, the characteristic impedance is about 7 Ω, and the pulse width is 138 ns.