Yu.I. Alekseev - Dr.Sc. (Eng.), Professor, Department of Antennas and Radio Transmitting Equipments, Southern Federal University, Taganrog, Russia
I.V. Semernick - Postgraduate Student, Department of Antennas and Radio Transmitting Equipments, Southern Federal University, Taganrog, Russia. E-mail: ione7nick@yandex.ru
A.V. Demyanenko - Ph.D. (Eng.), Associate Professor, Department of Antennas and Radio Transmitting Equipments, Southern Federal University, Taganrog, Russia

The same dynamic system can demonstrate various scenarios of transition to chaos which correspond to different parameters areas and driving direction. Furthermore, observable bifurcation sequences can be complex combined. Identification of the scenario of real dynamic system transition to chaos allow hereinafter develop recommendations to the system parameters and external force optimization for the purpose of radio-technical characteristics optimization - frequency band and output power level - of workable noise oscillation source for specific applied radio engineering tasks. The purpose of this article is to research of chaotic state of the microwave IMPATT oscillator under presence of own reflected signal. It is shown that the system transits to chaotic mode unevenly by means of single bifurcation. At the same time, phenomenon of intermittence regular and irregular oscillation is observed, which is the most noticeable under transition from chaos to multifrequency mode. It is necessary to notice that in τ parameter area the chaotic region was preceded by a sector of synchronization system by the own reflected signal. The validity of theoretic research results is confirmed by the correspondence behavior of mathematical model, which is used in simulation, in deterministic mode with experimental data obtained from real devices research.