We show theoretically that the use of a circular oversized waveguide with a helically corrugated internal surface as a dispersive medium ensures efficient compression of frequency-modulated microwave pulses up to peak powers of about 10 GW. According to the calculations, a pulse with the required frequency modulation can be obtained in a relativistic backward-wave oscillator operated in the 3-cm wavelength range and producing an output power of hundreds of megawatts. In a demonstration experiment, a 80-ns pulse of kilowatt power with frequency modulation in a 5% band was compressed to a 1.5-ns pulse with a 25-fold power amplification.
- circular oversized waveguide
- microwave pulses
- frequency modulation
Bratman, V. L., Denisov, G. G., Samsonov, S. V., Cross, A. W., Ronald, K., & Phelps, A. D. R. (2007). Method for achievement of a multigigawatt peak power by compressing microwave pulses of a relativistic backward-wave oscillator in a helical waveguide. Radiophysics and Quantum Electronics, 50(1), 36-48. https://doi.org/10.1007/s11141-007-0005-0