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Design of double layer printed spiral coils for wirelessly-powered biomedical implants

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4 Author(s)
Ehsan Ashoori ; Research Laboratory for Integrated Circuits and Systems (ICAS), Electrical & Computer Eng. Dept., K.N. Toosi University of Technology, Tehran, Iran ; Farzad Asgarian ; Amir M. Sodagar ; Euisik Yoon

In this paper employing double layer printed spiral coils (PSCs) is proposed for wireless power transmission in implantable biomedical applications. Detailed modeling of this type of PSCs is presented. Both calculations and measurements of fabricated double layer PSCs indicate that this structure can decrease the size of typical single layer PSCs without any change in the most important parameters of the coils, such as quality factor. Also, it is shown that with equal PSC dimensions and design parameters, double layer PSCs achieve significantly higher inductances and quality factors. Ultimately, a pair of double layer PSCs with a distance of 5 mm in air is used in an inductive link. The power transfer efficiency of this link is about 79.8% with a carrier frequency of 5 MHz and coupling coefficient of 0.189.

Published in:

2011 Annual International Conference of the IEEE Engineering in Medicine and Biology Society

Date of Conference:

Aug. 30 2011-Sept. 3 2011