Title
Phase Distribution Efficiency of cm-Scale Ultrasonically Powered Receivers
Author
Saccher, M. (TU Delft Electronic Components, Technology and Materials) 
Rashidi, A. (TU Delft Bio-Electronics)
Savoia, Alessandro Stuart (University of Roma Tre)
Giagka, Vasiliki (TU Delft Bio-Electronics; Fraunhofer Institute for Reliability and Microintegration IZM)
Dekker, R. (TU Delft Electronic Components, Technology and Materials; Philips)
Date
2023
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.
Subject
phase distribution efficiency
ultrasonic receivers
ultrasound power transfer
receiver partitioning
To reference this document use:
http://resolver.tudelft.nl/uuid:e7d89c7a-794d-42f1-af01-4819700e61b0
DOI
https://doi.org/10.1109/IUS51837.2023.10307986
Publisher
IEEE, Piscataway
Embargo date
2024-05-07
ISBN
979-8-3503-4646-6
Source
Proceedings of the 2023 IEEE International Ultrasonics Symposium (IUS)
Event
2023 IEEE International Ultrasonics Symposium (IUS), 2023-09-03 → 2023-09-08, Montreal, Canada
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-care Otherwise 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.
Part of collection
Institutional Repository
Document type
conference paper
Rights
© 2023 M. Saccher, A. Rashidi, Alessandro Stuart Savoia, Vasiliki Giagka, R. Dekker