Bistability and hysteresis in the emergence of pulses in microstrip Gunn-diode circuits

We develop time-domain simulations of microwave and THz radiation sources built as arrays of active devices when the radiation wavelength is small as compared to spacing between electronic components. We pursue an approach when the system is represented by equations with time-delay feedback that cou...

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Bibliographic Details
Published in:AIP advances 2014-12, Vol.4 (12), p.127126-127126-11
Main Authors: Yurchenko, V. B., Yurchenko, L. V.
Format: Article
Language:English
Subjects:
Bias
Bistability
Broadband
COMPARATIVE EVALUATIONS
Computer simulation
Continuous radiation
COUPLING
Delay
DESIGN
ELECTRIC POTENTIAL
Electronic components
Emergence
Gunn diodes
HYSTERESIS
INSTABILITY
MATERIALS SCIENCE
OSCILLATION MODES
PULSES
RADIATION SOURCES
SIMULATION
Stability
Ultrawideband
WAVELENGTHS
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Description
Summary:We develop time-domain simulations of microwave and THz radiation sources built as arrays of active devices when the radiation wavelength is small as compared to spacing between electronic components. We pursue an approach when the system is represented by equations with time-delay feedback that could generate chaos and other forms of complicated dynamics. The approach simplifies simulations of ultra-wideband effects and exceeds capabilities of frequency-domain methods. As a model case, we simulated a microstrip circuit with Gunn diode and a remote resonator emitting the radiation towards infinity. We observed the emergence of either the continuous waves or the trains of high-frequency pulses depending on the bias conditions. We found bistability and hysteresis in the onset of different oscillation modes that depends on the way of driving the bias voltage into the domain of instability of the given system. The results would allow one to improve the design of THz radiation sources with time-delay coupling between components.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4904226