A longitudinally pumped ferrite amplifier has been operated using two magnetodynamic modes for the signal and idler resonant circuits. This is in contrast to the more usual electromagnetic cavity-type resonance or the ferrite magnetostatic modes. These magnetodynamic modes result from the coupling of a cavity-type resonance with a magnetostatic resonance. The coupling or mixing is strongest when the two unperturbed resonant frequencies are the same. For the amplifier described in this paper a single crystal yttrium-iron garnet sphere was used. The magnetic bias field applied was 17 kMc/γ oe. The resulting magnetodynamic modes were resonant at 21 and 14 kMc, respectively, for the two branches of the mode tuning curve. Advantages of these modes for ferrite amplification are ease of coupling and lack of interference from other resonant modes.
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Roberts et al. (1962) studied this question.
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