Nonstationary phenomena in tapered gyro-backward-wave oscillators - art. no. 218301

Recently, it was found that a gyro-backward-wave oscillator (gyro-BWO) with a tapered waveguide can exhibit stationary oscillations at currents which exceed the starting current by more than 2 orders of magnitude, This result , at first glance, contradicts the theory of transients in untapered linear -beam BWO's, which predicts nonstationary oscillations at currents exceedin g the start current by a factor of 3. To explain this behavior of the taper ed gyro-BWO, its nonstationary theory is developed. The results obtained de monstrate the consistency of the tapered gyro-BWO operation with the known theory of transients and also show that the tapering may provide stationary oscillations at high currents.