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International Journal of Antennas and Propagation
Volume 2016, Article ID 7101207, 7 pages
Research Article

Integration of Resonant Coil for Wireless Power Transfer and Implantable Antenna for Signal Transfer

Automotive IT Platform Research Section, Electronics and Telecommunications Research Institute (ETRI), 1 Techno Sunhwan-ro 10-gil, Yuga-myeon, Dalseong-gun, Daegu 42994, Republic of Korea

Received 12 April 2016; Accepted 26 May 2016

Academic Editor: Sanghoek Kim

Copyright © 2016 Dong-Wook Seo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We propose the integration of the resonant coil for wireless power transfer (WPT) and the implantable antenna for physiological signal transfer. The integration allows for a compact biomedical implantable system such as electrocardiogram (ECG) recorder and pacemaker. While the resonant coils resonate at the frequency of 13.56 MHz for the WPT, the implantable antenna works in the medical implant communications service (MICS) band of 402–405 MHz for wireless communications. They share the narrow substrate area of a bar-type shape; the coil has the current path on the outer part of the substrate and the meandered planar inverted-F antenna (PIFA) occupies the inside of the coil. To verify the potentials of the proposed structure, a prototype is fabricated and tested in vitro. The power transfer efficiency (PTE) of about 20% is obtained at a distance of 15 mm and the antenna gain of roughly −40 dBi is achieved.