High Power Monocycle Pulse Generator for Through-the-Wall Radar Transmitter

This paper presents a sub-nanosecond pulse transmitter of through-the-wall surveillance radar. The basis of the generator is a step recovery diode and a unique pulse-forming circuit, which forms an ultra-wideband Gaussian pulse. High amplitude pulses are advantageous for obtaining a good radar range, especially when penetrating thick and lossy building walls. In order to increase the output power of the transmitter, the outputs of two identical pulse generators were connected in parallel. A transmission line pulse forming network was then used to form an output monocycle pulse. The measurements show waveforms of the generated monocycle pulses over 33 V in amplitude.