IEEE-NEMS 2023, Jeju, Korea
May 14 - May 17, 2023 (Sun. - Wed.), Ramada Plaza Hotel
Patch-Type Electromagnetic Energy Focusing Metasurface for
Wireless Power Transfer in Bio-Implantable Devices
Wonwoo Lee, Semin Jo, and Hojin Lee
Abstract
Herein, a patch-type metasurface is proposed that improves the power transferred to the skin by reducing the reflection loss of electromagnetic waves at the air–skin interface and forming a focal point at a specific location. The subwavelength-thickness (< λ/10) metasurface is introduced that focuses electromagnetic energy to a desired depth in multilayered biological tissues to enhance the transferred power for implantable devices. The stable focusing performance is demonstrated by confirming the robust focal point and field intensity profiles for oblique incident angles and polarization directions with enhanced voltage of approximately 11.1 dBmV at a depth of 10 mm in an in-vitro environment. By applying the patch-type metasurface to an actual implemented wireless power transfer system, an improved transmission coefficient of 6.37 dB is realized at a depth of 10 mm compared with that of a system without the metasurface patch.
