Abstract: A high-voltage fast-avalanche diode, being a silicon-avalanche shaper or sharpener (SAS), has a thick active region above 300 microns in thickness.

Abstract: A pulsed-power circuit includes first, second, third and fourth compression stages. The first and second stages each include at least one pre-charged capacitor and at least one inductor in series, and at least one switch operative to pump a DSRD (drift-step-recovery diode). The pre-charged capacitor of the second stage is pre-charged in negative direction with respect to the pre-charged capacitor of the first stage. The third and fourth stages each include at least one DSRD. The switches of the first and second stage are operative to drive (pump and then pulse) the DSRDs of the third and fourth stages.

Abstract: A pulsed-power circuit includes first, second, third and fourth compression stages. The first and second stages each include at least one pre-charged capacitor and at least one inductor in series, and at least one switch operative to pump a DSRD (drift-step-recovery diode). The pre-charged capacitor of the second stage is pre-charged in negative direction with respect to the pre-charged capacitor of the first stage. The third and fourth stages each include at least one DSRD. The switches of the first and second stage are operative to drive (pump and then pulse) the DSRDs of the third and fourth stages.

Abstract: A method for detection of underground anomalies including in a system of distributed antennas (10), which are leaky transmission lines, disposed in 16 boreholes (12) formed in a ground, a transmitter (14) being connected to one of the antennas (10), and a receiver (16) being connected to another of the antennas (10), injecting an electromagnetic pulse into one of the antennas (10), wherein the pulse gradually leaks out, and wherein if a speed of propagation in the line in which the pulse is injected is faster than a speed of propagation in the ground, a shock wave is transmitted through the ground, called a transmitted signal, and received as a received signal at another of the antennas (10), and wherein an underground anomaly diffracts the shock wave, resulting in a detectable disturbance in the received signal, and locating the anomaly as a function of a time delay of the disturbance relative to the transmitted signal.

Abstract: A method for detection of underground anomalies including in a system of distributed antennas (10), which are leaky transmission lines, disposed in 16 boreholes (12) formed in a ground, a transmitter (14) being connected to one of the antennas (10), and a receiver (16) being connected to another of the antennas (10), injecting an electromagnetic pulse into one of the antennas (10), wherein the pulse gradually leaks out, and wherein if a speed of propagation in the line in which the pulse is injected is faster than a speed of propagation in the ground, a shock wave is transmitted through the ground, called a transmitted signal, and received as a received signal at another of the antennas (10), and wherein an underground anomaly diffracts the shock wave, resulting in a detectable disturbance in the received signal, and locating the anomaly as a function of a time delay of the disturbance relative to the transmitted signal.