FIELD: piezoelectric engineering. SUBSTANCE: piezoelectric cavity has rectangular piezoelectric crystal plate 1, two isolating units 2 located on side of short edges of plate 1 and connected to it through straps 3. Isolating units 2 have nonoscillating parts 5 interconnected to form monolith structure of carrying frame 5. Frame is made of piezoelectric material; it surrounds crystal plate and is secured inside cavity holder at any part. Metal film electrodes 6 are formed on opposite sides of plate 1, isolating units 2, and frame 5. EFFECT: improved mechanical strength of cavity, enlarged output of serviceable cavities. 2 dwg
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