The development and experimental investigation of a large-current radiator (LCR) with a pulse generator using avalanche transistors is reported. The LCR is intend for radiating nonsinusoidal pulse electromagnetic waves with a duration of 2 ns. The radiated field strengths in both the near and the far field are measured. The LCR described produces magnetic field strengths of about 4.2 mA/m at a distance of 5 m for radiator current amplitudes of about 0.7 A with rise time of 1 ns. The width of the antenna pattern, measured by the drop of the field strength to one half of its peak value is 120/spl deg/.

Preliminary results of the comparative analysis of quantum radar (QR) based upon quantum entanglement phenomenon and noise radar (NR) based upon classical coherence and correlation processing of random signals are presented in this article. Common and distinguishing features of NR and QR are briefly discussed. A novel concept of a stepped-frequency quantum radar (SF-QR) for design of QR with range resolution capability is suggested. Field programmable gate array based digital generation of entangled signals is proposed as well.

It was shown that a spoof surface plasmon polariton (SSPP) with the uniform RF field distribution compatible with a sheet electron beam is resonantly excited by a bulk wave of an open cavity containing a nonuniform (bi-periodic) grating. This provides an efficient interaction of a wide sheet electron beam with a hybrid bulk surface mode (HBSM) in the THz Cherenkov oscillator that has been demonstrated by 3-D PIC simulations. The presented simulation results showed the excitation of oscillations in the range from 0.628 to 0.648 THz with watt level of output power and output efficiency up to 1% for the 100-mA 17.2–23.2-kV electron beam. The conditions for the suppression of the competing modes having variations across a grating width have been discussed.