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| Presentation | 2020-09-28 14:25 c-Axis tilted ScAlN film piezoelectric transformer in the UHF range Sarina Kinoshita (Waseda Univ./ZAIKEN), Takahiko Yanagitani (Waseda Univ./ZAIKEN/JST CREST)  US2020-35 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Battery-less sensors require energy harvesting from the ambient environment. RF-DC conversion with a rectifying antenna (so-called rectenna) is generally used to obtain energy from ambient electromagnetic waves. However, RF-DC conversion efficiency significantly decreases for weak RF signals such as the ambient electromagnetic waves. In this study, we introduce new types of BAW piezoelectric transformers based on ScAlN thin films in order to amplify the RF signal in the rectenna. The theoretical voltage gain was simulated by Mason’s equivalent circuit model. We also derived the simple formula describing the voltage gain of the BAW piezoelectric transformers without using the circuit model. New simpler model which is enough accurate in the vicinity of the resonant frequency was derived. The new 3 types of BAW piezoelectric transformers (based on (i) c-axis zig-zag HBAR structures, (ii) c-axis zig-zag FBAR structures and (iii) the combination of PZT and ScAlN thin films) were experimentally and theoretically demonstrated. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Piezoelectric transformer / Rectenna / c-Axis tilted ScAlN film / Polarity inverted multilayer piezoelectric film / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 120, no. 174, US2020-35, pp. 45-50, Sept. 2020. | |
| Paper # | US2020-35 | |
| Date of Issue | 2020-09-21 (US) | |
| ISSN | Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | US2020-35 |
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| Conference Information | |
| Committee | US |
| Conference Date | 2020-09-28 - 2020-09-28 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | US |
| Conference Code | 2020-09-US |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | c-Axis tilted ScAlN film piezoelectric transformer in the UHF range |
| Sub Title (in English) | |
| Keyword(1) | Piezoelectric transformer |
| Keyword(2) | Rectenna |
| Keyword(3) | c-Axis tilted ScAlN film |
| Keyword(4) | Polarity inverted multilayer piezoelectric film |
| Keyword(5) | |
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| Keyword(8) | |
| 1st Author's Name | Sarina Kinoshita |
| 1st Author's Affiliation | Waseda University/ZAIKEN (Waseda Univ./ZAIKEN) |
| 2nd Author's Name | Takahiko Yanagitani |
| 2nd Author's Affiliation | Waseda University/ZAIKEN/JST CREST (Waseda Univ./ZAIKEN/JST CREST) |
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| Speaker | Author-1 |
| Date Time | 2020-09-28 14:25:00 |
| Presentation Time | 25 minutes |
| Registration for | US |
| Paper # | US2020-35 |
| Volume (vol) | vol.120 |
| Number (no) | no.174 |
| Page | pp.45-50 |
| #Pages | 6 |
| Date of Issue | 2020-09-21 (US) |
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