期刊
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
卷 15, 期 -, 页码 1410-1413出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2015.2511187
关键词
Implanted antenna and brain-machine interface; two-turns loop antenna
资金
- Academy of Finland [265768, 258460]
- Jane and Aatos Erkko Foundation
- TEKES
We present a two-turns loop antenna with a magnetic core to transfer power wirelessly to a miniature 2 x 2 x 2-mm(3) cubic loop antenna in a cortical implant. Compared to a same-sized single-turn loop antenna, it achieves reduction in the specific absorption rate (SAR) and transmits 20 mW (11%) more power to the implant by maintaining the same link power efficiency. We also investigate the optimum distance of the external antenna from the body in terms of the link power efficiency and SAR. Moreover, we present a new method of estimating the worst-case voltage amplitude incident at the front end of the implanted microsystem under different impedance matching conditions. We have fabricated the simple and two-turns loop antennas and attested the link power efficiency of both in a liquid phantom mimicking the dielectric properties of the human skin at 100 MHz.
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