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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.2K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

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The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
559

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Updated: Sep 20, 2025

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Wearable Sensor Based on Flexible Sinusoidal Antenna for Strain Sensing Applications.

Mehran Ahadi1,2, Mourad Roudjane3, Marc-André Dugas4

  • 1Center for Optics, Photonics and Lasers (COPL), Department of Electrical and Computer Engineering, Université Laval, Quebec City, QC G1V 0A6, Canada.

Sensors (Basel, Switzerland)
|June 10, 2022
PubMed
Summary

A novel flexible sinusoidal antenna sensor offers enhanced strain sensing capabilities. This improved design, using conductive polymers, shows significantly higher sensitivity than previous models.

Keywords:
antenna sensorconductive polymerdipole antennaminiaturized antennasinusoidal antennastrain sensortunable antenna

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Biomedical Engineering

Background:

  • Existing antenna sensors for monitoring applications have limitations in flexibility and sensitivity.
  • Previous generations of antenna sensors were primarily based on glass materials, limiting durability.

Purpose of the Study:

  • To introduce and characterize a flexible sinusoidal-shaped antenna sensor for strain sensing.
  • To improve upon the sensitivity and material properties of previously developed antenna sensors.
  • To provide a design methodology for tailoring antenna parameters to specific electrical requirements.

Main Methods:

  • Modification of a half-wave dipole antenna into a flexible sinusoidal shape.
  • Analysis of electrical and radiative characteristics, including the impact of geometrical factors.
  • Development of design equations for estimating geometrical parameters based on electrical specifications.
  • Fabrication and testing of a conductive polymer antenna sensor and a copper reference antenna.

Main Results:

  • The new sinusoidal antenna sensor demonstrates up to 5.5 times greater sensitivity compared to the previous generation.
  • The use of conductive polymer material enhances flexibility and durability.
  • Electrical characteristics were analyzed in free space and over the human body.

Conclusions:

  • The flexible sinusoidal antenna sensor represents a significant advancement in strain sensing technology.
  • The improved sensitivity and material properties make it suitable for advanced monitoring applications.
  • The design approach provides a pathway for creating customized antenna sensors for various needs.