ORIGINAL RESEARCH article
Front. Electron.
Sec. Wearable Electronics
Efficient Communication Channel for Smart Contact Lens with Resonant Magneto-Quasistatic Coupling
Provisionally accepted
- Purdue University, West Lafayette, United States
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Magnetic resonant coupling is widely used for wireless power transfer in wearables but is typically employed in the strongly coupled regime, where the separation is smaller than or comparable to the device size. This work instead exploits resonant magnetoquasistatic (MQS) coupling to realize a wireless communication link between a necklace-mounted transmitter (Tx) coil and a receiver (Rx) coil embedded in a smart contact lens (SCL). A 15 cm Tx coil and an 8 mm peripheral Rx coil, operating around 26.8 MHz at axial separations of ≈15 cm and lateral offsets ≥9 cm, form a weakly coupled but robust near-field channel. Finite-element simulations show only ∼10 dB path-loss variation across misalignments and a ∼5 Mbps channel capacity over 1 MHz bandwidth, sufficient for compressed 480p/15 fps video and multi-sensor telemetry. Because ocular and facial tissues have µr ≈1 below 30 MHz, their presence causes negligible additional attenuation. A benchtop prototype with a 20 cm single-turn Tx coil and 1 cm four-turn Rx coil tuned near 26 MHz confirms ∼60 dB channel loss over necklace-eye distances and weak sensitivity to a tissue phantom, supporting the MQS-based analysis. Together, these results establish resonant MQS coupling as a viable high data rate communication backbone for future smart contact lenses.
Keywords: misaligned coil coupling, multi-coil systems, Resonant magnetic coupled communication, smart contact lens, weakly coupled region
Received: 14 Sep 2025; Accepted: 29 Dec 2025.
Copyright: © 2025 Shaw, Nath, Datta and Sen. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Sukriti Shaw
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