NDLI: A parallel-trace high-Q planar spiral coil for biomedical implants

Content Provider	IEEE Xplore Digital Library
Author	Hao Jiang Shiyu Zhou Di Lan Junmin Zhang Shahnasser, H. Goldman, K. Roy, S.
Copyright Year	2012
Description	Author affiliation: H-Cubed, Inc., Olmsted Falls, OH, 44138, USA (Goldman, K.) \|\| School of Engineering, San Francisco State University, CA 94132, USA (Hao Jiang; Shiyu Zhou; Di Lan; Junmin Zhang; Shahnasser, H.) \|\| Department of Bioengineering and Therapeutic Sciences, University of California at San Francisco, 94158, USA (Roy, S.)
Abstract	High-Q inductive coils are essential components in biomedical implants for efficient wireless charging and effective wireless sensing. The planar spiral coil (PSC) that can be easily optimized and reliably fabricated by lithographic tools is a preferred candidate. To support the inductive coupling at MHz range, the size of PSCs used in implants is much larger than those used in wireless communication circuits. Therefore, to achieve high Q, it is imperative to reduce the metal trace's unit-length-resistance. In this paper, multiple parallel-connected metal traces, instead of a conventional single trace, have been employed to reduce the unit-length-resistance by mitigating the skin effect. Although the approach was used to make stranded wires for mega-watts transmission systems, it has been used to design PSCs for the first time. The parallel-trace PSC exhibits 38%𢈼53% improvements in Q when it resonates with a capacitor at 𢈼10 MHz. Measurement results also indicate that there is 𢈼10% inductance reduction in the parallel-trace PSC compared to the single-trace PSC of the same design. Measurement results also indicate that, in a parallel-trace PSC, the length difference between the parallel-connected, side-by-side traces when they are winded into a coil, and the dielectric environment difference when they are placed in different layers, can be neglected when the operating frequency is less than the PSCs self-resonating frequency. Utilizing widely-available planar fabrication technologies, the parallel-trace PSC can be widely adopted in biomedical implants.
Starting Page	1
Ending Page	3
File Size	1310865
Page Count	3
File Format	PDF
ISBN	9781467310857
ISSN	0149645X
e-ISBN	9781467310888
e-ISBN	9781467310864
DOI	10.1109/MWSYM.2012.6259488
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-17
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Metals Implants Wireless sensor networks Wireless communication Coils Resonant frequency Inductance wireless sensing planar spiral coil biomedical implant wireless power transfer
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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