Abstract
In the domain of ultrasonically powered biomedical implants, there is an increasing interest in cm-scale ultrasonic receivers (RX). However, when a single-element transducer is used as the RX transducer, an uneven phase distribution across the RX area can significantly reduce the harvestable power. In this paper, we investigate the impact of lateral and angular misalignment on the acoustic field phase distribution across the RX surface. We show that, for a single-element RX transducer, lateral misalignment has minimal effect on the harvestable power, whereas even small angular misalignments can cause a considerable reduction, especially for larger RX sizes. We present a potential solution that consists of subdividing a large RX transducer (e.g. 20 × 20mm2) into smaller elements, which significantly improves power transfer efficiency by taking advantage of the smaller phase variation across the surface of each element. The trade-offs between achieving a minimum acceptable power transfer efficiency and managing the increased complexity in packaging and matching circuitry are also discussed.
Original language | English |
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Title of host publication | Proceedings of the 2023 IEEE International Ultrasonics Symposium (IUS) |
Place of Publication | Piscataway |
Publisher | IEEE |
Number of pages | 4 |
ISBN (Electronic) | 979-8-3503-4645-9 |
ISBN (Print) | 979-8-3503-4646-6 |
DOIs | |
Publication status | Published - 2023 |
Event | 2023 IEEE International Ultrasonics Symposium (IUS) - Montreal, Canada Duration: 3 Sept 2023 → 8 Sept 2023 |
Conference
Conference | 2023 IEEE International Ultrasonics Symposium (IUS) |
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Abbreviated title | IUS 2023 |
Country/Territory | Canada |
City | Montreal |
Period | 3/09/23 → 8/09/23 |
Bibliographical note
Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-careOtherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
Keywords
- phase distribution efficiency
- ultrasonic receivers
- ultrasound power transfer
- receiver partitioning