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Related Experiment Video

Updated: Jan 20, 2026

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A Displacement Sensor Based on a Normal Mode Helical Antenna.

Songtao Xue1,2, Zhuoran Yi1, Liyu Xie3

  • 1Department of Disaster Mitigation for Structures, Tongji University, Shanghai 200092, China.

Sensors (Basel, Switzerland)
|September 5, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a passive displacement sensor utilizing a helical antenna. The sensor detects displacement by measuring resonant frequency shifts, offering a linear and adjustable sensing range.

Keywords:
displacement sensorhelical antennanormal modeperturbation theoryresonant frequency

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Area of Science:

  • Electromagnetics
  • Antenna Theory
  • Sensor Technology

Background:

  • Traditional displacement sensors often face limitations in passive operation and sensitivity.
  • Helical antennas exhibit unique electromagnetic field distributions sensitive to external perturbations.

Purpose of the Study:

  • To develop and validate a passive displacement sensor leveraging the resonant properties of a normal mode helical antenna.
  • To investigate the relationship between displacement and resonant frequency shift for sensing applications.

Main Methods:

  • Utilizing perturbation theory to analyze the electric and magnetic field gradients within the helical antenna.
  • Employing numerical simulations with Ansoft High Frequency Structure Simulator (HFSS) for verification.
  • Fabricating and experimentally testing two sets of helical antenna-based displacement sensors.

Main Results:

  • Demonstrated a noticeable gradient change in electric and magnetic intensities due to dielectric rod insertion.
  • Confirmed a linear correlation between resonant frequency shift and applied displacement via simulation and experiment.
  • Validated the sensor's performance with experimental results showing linear proportionality.

Conclusions:

  • The developed passive displacement sensor based on a normal mode helical antenna is effective.
  • The sensor exhibits a linear response to displacement, with an adjustable sensing range.
  • This technology offers a promising solution for passive displacement sensing applications.