"Mathematics of Gunn Diode Oscillations in
Time-Delay Circuits: Chaos, Pulses, Hysteresis, and Bistability"
By
Vladimir Yurchenko
( Institute of Radiophysics and Electronics
of the National Academy of Sciences of Ukraine, Kharkov)
Abstract: New effects of nonlinear excitation of active
GHz devices (specifically, Gunn diodes) will be presented that have been
studied through computer simulations of extended microwave circuits (series or
parallel networks of transmission lines with active devices) under the
conditions of time-delay feedback. Formulations of problems and approaches to
their solutions will be discussed for a few cases of microwave networks. New
kinds of oscillations will be considered that emerge due to time-delay
coupling, e.g., multi-frequency excitation, short-pulse generation, broadband
dynamical chaos. Specific properties will be discussed such as conditions for
non-conventional regimes of oscillations, generation of trains of
high-frequency pulses, hysteresis and bistability of
switching and excitation.
Date: Tuesday, February 25, 2014
Time: 15:40
Place: Mathematics Seminar Room, SA-141
Tea and cookies will be served before the
seminar.