Patent ID: 11872591
Assignee: STMICROELECTRONICS S.R.L.
Field: Chemical engineering (Chemistry)
Classification: CPC B  G | IPC B  G

Claim 7:
8. An electronic system, comprising:
at least one micro-machined ultrasonic transducer, each of the at least one micro-machined ultrasonic transducer including:
a membrane element configured to transmit or receive ultrasonic waves, wherein, during transmission or reception of ultrasonic waves, the membrane element oscillates, about an equilibrium position, at a resonance frequency, wherein the equilibrium position of the membrane element is variable according to a biasing electric signal applied to the membrane element; and
a cap structure overlying the membrane element, wherein the cap structure forms a cavity between the cap structure and the membrane element, wherein a volume of the cavity is variable according to the equilibrium position of the membrane element, wherein the cap structure includes an opening configured to input or output the ultrasonic waves into or from the cavity, wherein the cap structure and the membrane element act as tunable Helmholtz resonator in which the resonance frequency is variable according to the volume of the cavity.