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Related Experiment Video

Updated: Feb 12, 2026

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Optimizing miniature antenna coils is key for reliable, battery-free wearable sensors. This study presents a design for a skin hydration sensor that maintains performance despite bending, ensuring stable power and data communication.

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Area of Science:

  • Wearable technology
  • Biomedical engineering
  • Wireless communication

Background:

  • Efficient wireless power transfer is crucial for battery-free wearable sensors.
  • Antenna coil performance significantly impacts Near Field Communication (NFC) sensor efficiency and data reliability.
  • Miniaturization of sensors often compromises coil performance and communication sensitivity.

Purpose of the Study:

  • To optimize the design of a miniature antenna coil for a wearable skin hydration sensor.
  • To ensure stable resonant frequency, power reception, and data communication under mechanical deformation.
  • To develop a compact, durable, battery-free sensor platform for real-time monitoring.

Main Methods:

  • Coil design and optimization for miniature wearable sensors.
  • Experimental validation of antenna coil performance under bending conditions.
  • Integration of the optimized coil into a battery-free skin hydration sensor platform.
  • Environmental testing and polydimethylsiloxane (PDMS) encapsulation for durability.

Main Results:

  • An optimized miniature antenna coil design was achieved for wearable sensors.
  • Stable resonant frequency, power reception, and data communication were maintained even with mechanical deformation.
  • A compact, battery-free sensor platform for real-time skin hydration monitoring was successfully developed.
  • The sensor platform demonstrated mechanical durability and long-term stability through rigorous testing.

Conclusions:

  • Coil optimization is critical for next-generation wearable healthcare devices.
  • The developed sensor platform enables reliable, real-time skin hydration monitoring.
  • The study provides a foundational design framework for miniature sensor systems.