A mutually decoupled coil system to improve sensitivity of inductively coupled communication

Abstract

Abstract This paper proposes a mutually decoupled transmission and receiver coil (MDC) system to improve the sensitivity of inductively coupled communication. The proposed communication system is intended to be mounted on the frame of a spectacle and used to transfer a detectable voltage signal through weak inductive coupling with an implant measuring intraocular pressure (IOP). The implant consists of a coil that resonates with a capacitor. The capacitance of this capacitor is designed to change with the IOP, thus leading to a change in the self‐resonant frequency of the implant. The transmission coils excite the implant, while the decoupled receiver coils continuously monitor the self‐resonant frequency of the implant. The induced voltage across the receiver coil is used to determine the IOP. Simulation results show that a 1.43% change in the sensor capacitance leads to a 1 mV change in the voltage induced across the receiver coils. The experimental results reveal that raising the self‐inductance of the MDC on the transmission side results in a 0.5%/mV increase in sensitivity.

Keywords

• coils
• inductive power transmission