OMNIDIRECTIONAL POLYHEDRAL ULTRASOUND TRANSDUCER FOR POWERING IMPLANTABLE MICRODEVICES
- Authors
- Islam, Sayemul; Park, Moonchul; Song, Seung Hyun; Kim, Albert
- Issue Date
- Jun-2021
- Publisher
- IEEE
- Keywords
- Ultrasonic powering; barium titanate; piezoelectric; omnidirectional; wireless powering; implantable; microdevice
- Citation
- 2021 21ST INTERNATIONAL CONFERENCE ON SOLID-STATE SENSORS, ACTUATORS AND MICROSYSTEMS (TRANSDUCERS), pp 1404 - 1407
- Pages
- 4
- Journal Title
- 2021 21ST INTERNATIONAL CONFERENCE ON SOLID-STATE SENSORS, ACTUATORS AND MICROSYSTEMS (TRANSDUCERS)
- Start Page
- 1404
- End Page
- 1407
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/146173
- DOI
- 10.1109/TRANSDUCERS50396.2021.9495556
- ISSN
- 2167-0013
2167-0021
- Abstract
- Ultrasonic powering is an emerging power source for implantable microdevices due to its superior efficiency in energy transfer at millimeter-scale, long operation distance, and near omnidirectionality. In this paper, we investigate a novel polyhedral ultrasound transducer with emphasis on angular alignment between piezoelectric poling vector and incident waves. Three different polyhedrons (i.e., sphere, octahedron, and dodecahedron) are fabricated via 3D printing lead-free barium titanate ceramic. The maximum output voltage for a unit area occurred at 0 degrees when the poling and waves direction aligned, which were measured to be 0.677 +/- 0.071, 1.058 +/- 0.049, and 0.709 +/- 0.092 V, respectively. At the extreme angular misalignment at 90 degrees (poling and waves perpendicular to each other), only the dodecahedron could sustain the voltage output with 21% reduction, whereas sphere and octahedron dropped by 46%. The results imply that the geometry factor may overcome the poling vector, enabling omnidirectional ultrasonic powering for implantable microdevices.
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