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Abstract
A Gunn diode oscillates in a number of different modes, such as transit-time, delayed domain, quenched domain, LSA, hybrid and relaxation modes. The relaxation mode of operation is expected to yield an efficiency of 30% or more compared to the 15% maximum efficiency of other modes. However, this mode of operation is not well understood and work is being carried out at present on its different aspects. The present paper reviews the work reported in the literature on the properties of a relaxation mode Gunn oscillator.
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