Formation of high power microwave pulses with adjustable parameters in active X-band RF compression systems

The work presents the results of theoretical and experimental studies of the formation of microwave pulses with the adjustable power, duration, repetition rate and the envelope form during energy output from the cavity by controlled transformation of the oscillation mode at the waveguide stub coupling aperture. Pulse parameters are changed by adjustable elements of the coupling of modes, which directly affect to the coefficient of the coupling of modes h. The possibility to form a series of subnanosecond MW pulses at a fractional energy output and nanosecond pulses of various pulse duration at a single complete output of high frequency energy from the compressor cavity is demonstrated. The envelope of the pulses is calculated through the recurrence relations between the amplitudes of waves in the system, the relations between which have been recorded according to the scattering matrix method. Using this approach on passive X-band RF pulse compression system, we obtained power gain of 8-9 dB, 8-10 ns pulse duration at 9.248 GHz.