Transmission line modeling of active microwave pulse compression systems

Microwave pulse compression using a waveguide cavity composed by an inductive iris and an H-plane T-junction with the transverse arm shorted is studied using the individual components' equivalent circuits and transmission line theory. The equivalent circuit model of the device is studied in detail and key figures such as the length of the waveguide cavity, the iris width as well as the cavity gain and cavity leakage are calculated analytically. Furthermore, a design procedure based on transmission line theory is proposed. As a verification of the proposed method, a microwave pulse compressor working at 1.3GHz is studied and then compared with the results of a full-wave three dimensional commercial electromagnetic code as well as with literature-available experimental results.