Phase locking of Josephson flux-flow oscillators in non-uniform microwave fields

Phase locking phenomena in Josephson flux-flow oscillators induced by non-u niform microwave fields are investigated both numerically and analytically. For low values of the amplitude of the microwave signal, a good agreement is found between analytical and numerical results. For odd phase locking st eps, the agreement extends also to high amplitude values of the microwave s ignal. The discrepancy observed at high microwave amplitudes for even phase locking steps, is also discussed. (C) 2001 Published by Elsevier Science B .V.