12 December 2017 Theoretical analysis and experimental verification of wideband tunable radial line millimeter waveguide voltage controlled oscillators
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Proceedings Volume 1514, 15th International Conference on Infrared and Millimeter Waves; 15147F (2017) https://doi.org/10.1117/12.2301677
Event: 15th International Conference on Infrared and Millimeter Waves, 1990, Orlando, FL, United States
Abstract
A new equivalent circuit is proposed and analyzed for a Voltage Controlled Oscillator in reduced height waveguide using a Gunn coupled to a varactor via two metallized discs in the waveguide H plane. The theoretical analysis which is applicable to both fundamental and harmonic oscillators is performed with computer modelling software that includes for the first time two closely interdependent double radial transmission lines. Each of the latter has as its input impedance the Gunn or varactor chip and package circuit elements.

Extensive experimental investigation applied at Ka band, of all VCO parameters including the effects of a sliding short circuit have confirmed the accuracy of the analysis. For example, a prediction of a 3.7 GHz or 13% tuning bandwidth at 28.5 GHz was experimentally confirmed. The accuracy of the analysis together with the rugged and modular VCO construction are useful for production technology of millimeter wave Gunn or IMPATT VCO's for Electronic Warfare or communications tunable local oscillator applications.
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Nizar Sultan, Nizar Sultan, } "Theoretical analysis and experimental verification of wideband tunable radial line millimeter waveguide voltage controlled oscillators", Proc. SPIE 1514, 15th International Conference on Infrared and Millimeter Waves, 15147F (12 December 2017); doi: 10.1117/12.2301677; https://doi.org/10.1117/12.2301677
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