This paper presents experimental results on a tunable microstrip signal-to-noise enhancer based on NiFe films. Structures involving the first- and second-order Suhl instabilities are compared. The enhancement factor is 10dB for a structure involving only the second order instability and an enhancement factor of 30dB is found for a structure where the first order instability is allowed.
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Khivintsev et al. (2008) studied this question.
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