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Paper Abstract and Keywords
Presentation 2023-12-22 15:20
[Poster Presentation] SMR-type piezoelectric transformer using shear mode c-axis zigzag ScAlN multilayer
Kazutaka Siraiwa (Waseda Univ.), Takahiko Yanagitani (Waseda univ.) US2023-64
Abstract (in Japanese) (See Japanese page) 
(in English) RF signal can be converted to DC signal using an antenna and diode (rectenna). When distance of wireless transfer is long, RF-DC conversion efficiency is inefficient because a weak RF signal cannot exceed the threshold voltage of the diodes in the rectenna. This study proposes resonator type piezoelectric transformer based on c-axis zig-zag ScAlN films. Solidly mounted resonator (SMR) type transformer using an acoustic Bragg reflector enables a wider bandwidth operation than previously reported film/substrate type transformer.. As a result, zig-zag multilayers where c-axis oriented 180° symmetrically on the acoustic Bragg reflector was fabricated by oblique RF magnetron sputtering. Voltage gain of 2.7 and the fractional bandwidth of 3.2% which was 46 times wider than that of film/substrate type transformer were observed.
Keyword (in Japanese) (See Japanese page) 
(in English) Rectenna / ScAlN / polarization inversion structure / c-axis zig-zag / / / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 321, US2023-64, pp. 47-52, Dec. 2023.
Paper # US2023-64 
Date of Issue 2023-12-15 (US) 
ISSN Online edition: ISSN 2432-6380
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)
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Conference Information
Committee EA US  
Conference Date 2023-12-22 - 2023-12-23 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English) [Joint Meeting on Acoustics and Ultrasonics Subsociety] Engineering/Electro Acoustics, Ultrasonics, etc. 
Paper Information
Registration To US 
Conference Code 2023-12-EA-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) SMR-type piezoelectric transformer using shear mode c-axis zigzag ScAlN multilayer 
Sub Title (in English)  
Keyword(1) Rectenna  
Keyword(2) ScAlN  
Keyword(3) polarization inversion structure  
Keyword(4) c-axis zig-zag  
1st Author's Name Kazutaka Siraiwa  
1st Author's Affiliation Waseda University (Waseda Univ.)
2nd Author's Name Takahiko Yanagitani  
2nd Author's Affiliation Waseda university (Waseda univ.)
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Speaker Author-1 
Date Time 2023-12-22 15:20:00 
Presentation Time 120 minutes 
Registration for US 
Paper # US2023-64 
Volume (vol) vol.123 
Number (no) no.321 
Page pp.47-52 
Date of Issue 2023-12-15 (US) 

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