This paper describes a low-cost architecture for the generation of subnanosecond pulses based on the transient response of passive filters. Two prototypes are developed to demonstrate experimentally this approach. The first one covers the band 1.61 GHz to 10.6 GHz for medical imaging systems and the second one the band 1.99 GHz to 10.6 GHz for through-wall imaging and surveillance systems. In both cases, we obtain pulses with spectral densities well adapted to the FCC rules.

An architecture for the generation of short pulses based on a filter step response technique is described. One uses the transient response of a passive circuit to an input square signal. This approach is experimentally demonstrated by the generation of subnanosecond pulses compatible with the indoor frequency mask authorized by the Federal Communications Commission for ultrawideband applications. It is shown that a pulse repetition frequency of 1 GHz can be achieved. The effect of the transition time of the source is analyzed and is shown not to be a limitation.

A low-cost architecture for the generation of Gaussian, monocycle and doublet pulses is described. It is based on a passive network to which step signals is applied. Prototypes are realized to demonstrate experimentally this approach in the UWB band 3.1 GHz to 10.6 GHz for the three pulse shapes. In these three cases, sub nanosecond pulses with a small ringing are obtained.