Abstract
Two kinds of hysteresis are observed on curves of oscillation power expressed as a function of bias voltage of a tunnel-diode microwave oscillator. The oscillator is of a straight 2/4 strip trans-mission line resonator of the frequency of about 1.6 Gc/sec.
One kind of the hysteresis resembles the one usually observed in a low frequency region; it can be quantitatively analysed by nonlinear static characteristics of the tunnel-diode, analogous to the hysteresis at low frequencies.
The other kind of the hysteresis, which occurs weakly at a lower bias voltage with a linear characteristic, can be explained by a drift of the junction temperature during the operation.
