Transmission line transformer with mutually coupled windings

A transmission line transformer(TLT) with mutually coupled windings is described in this paper. All transmission lines of the transformer except the first stage are wound on a common ferrite core. A equivalent circuit method is introduced to analyze this model and an analytic expression of step response is derived. It is shown that TLT with the above-mentioned structure has a significantly slower drop rate than those with conventional structures. A four-stage TLT with this structure whose input and output impedance are 4.2 and 67.7 respectively was developed. A pulsed power source based on the TLT was developed, which generated voltage pulse with pulse width of 120 ns, and rise time of 20 ns. Amplitude of this pulse is four times of that generated by pulse forming network discharging on a load of 4.2 directly, and these two voltage waveforms have almost the same temporal shape.