Affiliations: Department of Medical Engineering, Tokyo City University, Setagaya-ku, Tokyo, Japan
Correspondence:
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Corresponding author: Yuichi Shimatani, Department of Medical Engineering, Tokyo City University 1-28-1 Tamadutumi, Setagaya-ku, Tokyo 158-8557, Japan. E-mail:yshimat@bme.tcu.ac.jp
Abstract: Several types of small spiral coils were made as receiver
coils for wireless power-transmission to the implantable medical devices.
The electrical characteristics of the coils were tested in the air and the
physiological saline solution under the similar ionic condition to the body
fluid. Both of the effective inductance and the effective loss were
increased in the saline in the range of tested frequency. In the saline,
relationship between the operating frequency and the effective inductance
closely fitted to the equation curve derived from a simple circuit model
that includes a stray capacitance component. The values of capacitance
estimated from the curve fittings were proportional to the surface area of
the coil.
Keywords: Wireless power transfer, implantable device, spiral coil
