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Theoretical and numerical study on optimization of diode parameters in virtual cathode oscillator

Liu Jing Shu Ting Li Zhi-Qiang

Theoretical and numerical study on optimization of diode parameters in virtual cathode oscillator

Liu Jing, Shu Ting, Li Zhi-Qiang
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Publishing process
  • Received Date:  03 December 2009
  • Accepted Date:  21 December 2010
  • Published Online:  05 May 2011

Theoretical and numerical study on optimization of diode parameters in virtual cathode oscillator

  • 1. College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China

Abstract: The dependences of microwave efficiency and frequency on the parameters of diode in virtual cathode oscillator (VCO) are studied with particle-in-cell simulations, which further gives the effects of diode impedance on microwave efficiency and frequency. The characteristic impedance of microwave mode in virtual cathode oscillator is derived as in other high power microwave generators with slow-wave configurations and is used to analyze the optimization of diode parameters. It is shown that the optimal values of diode parameters are obtained when the diode impedance matches with the characteristic impedance of microwave mode in VCO with coaxial wave guide as well as in VCOs with other configurations. This is a good theoretical explanation for the optimization of diode in VCO and can be used to guide the design of devices.

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