FIELD: acoustoelectronics. SUBSTANCE: acoustic surface-wave narrow-band filter has piezoelectric substrate placed in sealed case with its working surface mounting interdigital transducers; mounted on non-working side of substrate whose ends are fixed to case base by posts so that non-working surface does not come in contact with case base is bimorph piezoelectric strip whose center is fixed with piezoelectric substrate and on edges it is fixed to case base by means of posts so that definite clearance larger that amount of piezoelectric substrate sag due to DC control voltage applied to bimorph plate electrodes is provided between plate and case base. EFFECT: reduced center frequency drift at ambient temperature fluctuations. 3 dwg
