Antenna and coil design for wireless signal detection and charging of embedded power active contact lens

Author

Ng, Bryan ; Heckler, Paul ; Do, Alex ; Azar, Phillip ; Leon, Errol ; Smilkstein, Tina

Author_Institution

California Polytech. State Univ., San Luis Obispo, CA, USA

fYear

2014

fDate

26-30 Aug. 2014

Firstpage

5956

Lastpage

5959

Abstract

This paper presents a screen printed 2.4 GHz antenna and induction charging coil for an active contact lens with a single large pixel user display and on-board 3.8 V 5 uAh rechargeable battery. The antenna traces are printed using silver conductive paste on a 25 um polyethylene terephthalate (PET) substrate. The incoming signal from the antenna feeds into an IC that amplifies and rectifies the signal. The coil provides wireless energy transfer to inductively charge a thin film battery [1] located on the contact lens. The printed antenna achieved a S11 of -4 dB at 2.4 GHz and a gain of -13 dB.

Keywords

UHF antennas; biomedical electronics; coils; contact lenses; inductive power transmission; microstrip antennas; secondary cells; signal detection; silver; Ag; PET substrate; antenna design; antenna feeds; antenna traces; conductive paste; embedded power active contact lens; frequency 2.4 GHz; gain -13 dB; induction charging coil; polyethylene terephthalate substrate; rechargeable battery; screen printed antenna; size 25 mum; thin film battery; voltage 3.8 V; wireless energy transfer; wireless signal detection;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society (EMBC), 2014 36th Annual International Conference of the IEEE

Conference_Location

Chicago, IL

ISSN

1557-170X

Type

conf

DOI

10.1109/EMBC.2014.6944985

Filename

6944985