Criterion for Nonreciprocal Injection Locking of Bilateral Microwave Oscillators (Correspondence)

A criterion is presented for establishing the required degree of isolation between injection-locked microwave oscillators to prevent reverse Iocking. In particular, the effect of circulator directivity and oscillator harmonics on the performance of the locking circuit is discussed. The injection-locked performance of pulsed and CW transferred electron oscillators is used as an example.