Bandwidth enhancement of dielectric resonator loaded chaotic Colpitts oscillator: an experimental study

Bibha Kumari and Nisha Gupta

Journal of Electromagnetic Waves and Applications, 2025, vol. 39, issue 16, 2009-2018

Abstract: The development of microwave chaotic Colpitts oscillators is of significant current interest due to their potential applications in chaotic communication and ultra-wideband (UWB) wireless communication systems. This manuscript demonstrates the experimental investigation and simulation of a chaotic Colpitts oscillator using dielectric resonator (DR). The chaotic Colpitts oscillator causes chaotic behavior in the system's output due to nonlinearities in the circuit dynamics, which are frequently brought about by the active device. The proposed modified chaotic Colpitts oscillator circuit consists of a Philips microwave transistor BFG425W (BJT) as a nonlinear element and a DR as a resonant element which can advance the chaos bandwidth upto several gigahertz. The use of DR enhances frequency selectivity and high-Q resonance aid in reducing phase noise and enhancing spectral purity, which is essential for communication systems. This oscillator circuit can produce periodic as well as chaotic signals. The DR-loaded chaotic Colpitts oscillator's performance is contrasted with that of the classical chaotic Colpitts oscillator without DR. The circuit is simulated utilizing Microwave Office (MWO) software by AWR and the simulation results are validated experimentally. Timing diagram and power spectrum are used for the comparison. The proposed chaotic Colpitts oscillator has an oscillation frequency of 3.8 GHz. The spectrum analyzer's display of the modified chaotic Colpitts oscillator signal shows discernible harmonics upto 18 GHz. The designed chaotic oscillator can be employed in chaotic communication and ultra-wideband wireless communication systems.

Date: 2025
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DOI: 10.1080/09205071.2025.2535645

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