02. Wireless power transfer in smart contact lenses

Smart contact lenses are a platform for a large variety of functions, such as glucose monitoring, intraocular pressure monitoring, eye direction extraction for transport applications. The transfer of power from the external world towards the contact lens is fundamental to ensure the correct operation of electronic circuits and sensors on the contact lens. Wireless power transfer (WPT) solutions are very interesting [1], [2].


This project aims to simulate and design a WPT system based on two loop antennas (working at 13.56 MHz) and a rectifier circuit. The pre-design of the loop antennas is going to be performed by quasi-analytical formulas. ADS/CST will be used for further validation of the electromagnetic behaviour/power transfer of the two loop antennas. The dimensions of the loop antennas need to respect realistic constraints of contact lenses and the frame of eyeglasses. The design is therefore constrained. Realistic values of the impedance of an embedded battery will be used to simulate the load.

Keywords: Wireless power transfer, smart contact lenses.


[1] Y.-J. Kim et al., “Eyeglasses-powered, contact lens-like platform with high power transfer efficiency,” Biomedical microdevices, vol. 17, no. 4, pp. 1-9, Aug. 2015.
[2] J.-C. Chiou et al., ”A Wirelessly Powered Smart Contact Lens with Reconfigurable Wide Range and Tunable Sensitivity Sensor Readout Circuitry”, Sensors, vol. 17, no. 1, 2017.



Yves Rolain
Francesco Ferranti (Institut Mines-Télécom Atlantique)
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