Numerical and Experimental Studies on the Chaotic Dynamics of Driven Gunn Oscillator

B  C  Sarkar; J  Chakraborty  and S  Sarkar

doi:10.17485/ijst/2014/v7i7.13

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Numerical and Experimental Studies on the Chaotic Dynamics of Driven Gunn Oscillator

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Indian Journal of Science and Technology

DOI: 10.17485/ijst/2014/v7i7.13

Year: 2014, Volume: 7, Issue: 7, Pages: 924–932

Original Article

Numerical and Experimental Studies on the Chaotic Dynamics of Driven Gunn Oscillator

B. C. Sarkar^1*, J. Chakraborty¹ and S. Sarkar²

1 Department of Physics, The University of Burdwan, Golapbag, Burdwan-713104, West Bengal, India; bcsarkar_phy@yahoo.co.in
2 Department of Electronics, Burdwan Raj College, Burdwan-713104, West Bengal, India

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

Dynamics of a microwave (X band) Gunn oscillator in presence of a periodic forcing signal has been critically studied to explore the existence of chaos in the behavior of the driven Gunn oscillator (DGO). A broad band continuous spectrum is experimentally observed at the output of the DGO just at the verge of the synchronization band for certain strength and frequency of the forcing signal. For characterisation of the obtained broad band signal, time domain analysis of the frequency down converted DGO output is done and different chaos quantifiers like Maximum Lyapunov exponent and Correlation dimension are evaluated to confirm the chaotic mode of oscillations. Numerical simulation of the system equations also indicate that the dynamics of the DGO enters into a chaotic domain at these conditions.

Keywords: Driven System, Gunn Diode, Microwave Chaos, Synchronized Oscillator