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The picosecond photoconductive switches are developed and used to detect the pulse laser waveform. By using the photoconductive switches, an novel lab model of ultra-wide band(UWB) radar is also developed. The experimental results are given to show the performances of the switches and the UWB radar.

Recently the backscattering of an electromagnetic (EM) missile with an energy decreasing as r−e by a perfectly conducting plate has been studied and the analysis shows that the energy backscattered varies as r−e with the same exponent as the incident EM missile. Scattering of an EM missile by other shapes is left as an open question. In this paper we study the backscattering of an EM missile with energy decreasing as r−e by a perfectly conducting elliptical cylinder. It has been shown that the rate of the energy decay for the backscattered field far from the cylinder is proportional to r−(1+e), which is faster than r−e for plate scattering but still slower than the ordinary energy decay r−2 for a two‐dimensional backscattered field.

The propagation properties of a plasma waveguide in a lossy material under a finite magnetic field are analyzed,particularly for the variations of their propagation constants with plasma parameters,surrounding material and external magnetic field.The analysis show that the propagation properties of such a magnetized plasma-filled waveguide are easy to be controlled compared with those of plasma waveguide to which no external magnetic field or an infinite external magnetic field is applied.

In this paper, we present a general study on backscattering of electromagnetic (EM) missile by a perfectly conducting cylinder of arbitrary cross section. We find that, when an EM missile with energy decreasing as r-ε(0 -εR/(2r + R), where R is the radii of curvature at tie specular point of the target.