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Interaction between a vircator microwave generator and a resonant cavity is produced by enclosing the virtual cathode inside a right circular cylinder. By varying the cavity length, frequencies corresponding to the TM01n cavity modes are tuned to resonate with the broad- band oscillating virtual cathode. Nonresonant frequencies are suppressed, decreasing the bandwidth of the emitted radiation by a factor ≥5. Measured microwave power is about 4 times that from a detuned cavity.

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High-power relativistic magnetrons operating in both S-Band and X-Band (4 GHz) and 8·5 GHz) have been developed with a variety of extraction methods. Using a six window radial extraction scheme, the S-Band magnetron produces ∼3·6 GW. The X-Band magnetron produces 0·05 GW with one radial extraction window. Axial extraction from all six vanes produced power in excess of 0·3 GW. Enhanced erosion and gap closure occur in the smaller X-Band resonator.