Synchronous and chaotic oscillations in Gunn oscillators

We studied both theoretically and experimentally the effect of the dynamic chaos on stability of synchronous oscillations of millimeter wave Gunn oscillators. It was found that the chaotic instability can arise in weakly nonlinear mode of excitation, and the destruction of synchronous oscillations canbe caused by even not very large perturbation. Such a pertubation can be, for example, an additional harmonic component of the lock-on signal of low-frequency hindrance in a supply circuit.