A Cross-Band High-Power Microwave Generator With Wide Frequency Tunability Based on a Relativistic Magnetron and a Radial Transit-Time Oscillator

We propose a novel cross-band high-power microwave (HPM) generator which is based on the relativistic magnetron (RM) with all cavity axial extraction and the radial three-cavity transit-time oscillator (TTO). A foil structure is used to isolate the output microwaves of the RM and the TTO. A regulating ring is introduced before the anode block of the RM to adjust the resonant frequency of the RM. A downstream endcap is added to collect the leakage current from the RM and delay the decrease in the output power. The particle-in-cell simulations show that as the diode voltage is 420 kV, the diode current is 11.4 kA, and the magnetic field is 0.22 T, an output power of 680 MW at the L-band from the RM and 1280 MW at the S-band from the TTO have been achieved, with a total beam-wave conversion efficiency of 41%. Moreover, the RM frequency ranges for about 10% by adjusting the position of the regulating ring, and the TTO frequency bandwidth is up to 68%, which covers the S-and C-band, by changing the cavity width of the radial TTO axially.