Abstract
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 testedin 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.
Highlights
With growing interests in U-healthcare, studies on the biomedical implant devices, such as capsule endoscope, pacemaker, electrocardiogram (ECG) recorder, neurostimulator, and retinal implant, have drawn high attention
An implantable antenna works in human or animal body and ensures the wireless communications, and many researches on the implantable antenna design have been carried out [1,2,3,4,5,6,7,8,9]
The dipole with spiral arms [1], meandered planar inverted-F antenna (PIFA) [3], and spiral PIFA [4] has been designed for this purpose
Summary
With growing interests in U-healthcare, studies on the biomedical implant devices, such as capsule endoscope, pacemaker, electrocardiogram (ECG) recorder, neurostimulator, and retinal implant, have drawn high attention. Studies related to the implant device have used an inductive link to simultaneously implement wireless communication and wireless power transfer. In this case, the high Q-factor of resonant coils to achieve the high PTE brings about narrowing the communication bandwidth; the International Journal of Antennas and Propagation. An implant device communicates with a base-station using the MICS frequency band and transfers the sensed ECG signals to the exterior base-station. Because the implant device receives the signal and power source from the exterior base-station, the resonant coil and MICS antenna should be located on the outward surface of the implant device.
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