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Flexible Wireless Passive LC Pressure Sensor with Design Methodology and Cost-Effective Preparation
Zhuqi Sun1, Haoyu Fang1, Baochun Xu1
1College of Electronics and Information Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
Micromachines
|August 27, 2021
Summary
This study introduces a highly sensitive flexible pressure sensor for monitoring physical motion. The new wearable electronic device offers improved conformability and a novel antenna for portable readout, enhancing exercise monitoring.
Area of Science:
- Materials Science
- Electrical Engineering
- Biomedical Engineering
Background:
- Continuous monitoring of physical motion is crucial for appropriate exercise levels, often requiring wireless flexible wearable electronic devices.
- Existing flexible LC pressure sensors suffer from low sensitivity due to inflexible materials and poor stretchability, limiting their conformability to curved body surfaces.
- Traditional metal ring readout devices are inadequate for portable, integrated sensing systems.
Purpose of the Study:
- To develop a highly sensitive flexible LC pressure sensor with enhanced conformability for accurate physical motion monitoring.
- To design an integrated, portable readout antenna system for the flexible pressure sensor.
- To evaluate the sensor's performance in detecting limb bending and facial muscle movements.
Main Methods:
- Fabrication of a capacitive pressure sensor using Ecoflex microcolumns as dielectric material via a metal mold copying method.
- Utilizing Ecoflex elastomer substrates for improved conformability to curved skin surfaces.
- Employing a coplanar waveguide-fed monopole antenna connected to a vector network analyzer for pressure-dependent resonance frequency measurements.
Main Results:
- The flexible LC pressure sensor demonstrated a high sensitivity of -2.2 MHz/KPa within a pressure range of 0-23,760 Pa.
- Resonant frequency showed a linear decrease with increasing applied pressure.
- The designed monopole antenna achieved a higher vertical readout distance (up to 4 cm) compared to traditional copper rings and allows for integration with RF circuits.
Conclusions:
- The developed flexible LC pressure sensor exhibits excellent sensitivity and conformability for effective physical motion monitoring.
- The integrated antenna system enables portable and efficient readout, suitable for wearable applications.
- This technology holds significant potential for integration into body sensor networks for continuous physical activity tracking and health monitoring.
