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A Passive Wireless Crack Sensor Based on Patch Antenna with Overlapping Sub-Patch.

Songtao Xue1,2, Zhuoran Yi3, Liyu Xie4,5

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Summary
This summary is machine-generated.

This study introduces a novel passive wireless crack sensor using an unstressed patch antenna. The sensor detects crack width by measuring resonant frequency shifts, offering a reliable method for structural health monitoring.

Keywords:
covered radiation patchcrack width monitoringpassive wireless sensorpatch antenna

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Structural Health Monitoring

Background:

  • Traditional monolithic patch antennas for deformation measurements face challenges with strain transfer and bonding.
  • Developing robust, passive wireless sensors is crucial for effective structural health monitoring.

Purpose of the Study:

  • To present a passive wireless crack sensor based on an unstressed patch antenna design.
  • To investigate the relationship between antenna resonant frequency shifts and crack width.

Main Methods:

  • Utilized cavity model theory to establish the link between resonant frequencies and antenna/sub-patch overlap.
  • Employed Ansoft high-frequency structure simulator (HFSS) for numerical verification.
  • Fabricated a prototype for experimental validation.

Main Results:

  • Demonstrated a sensitivity of 120.24 MHz/mm within a 1.5 mm measuring range.
  • Confirmed a linear relationship between resonant frequency shifts and applied crack width.
  • Achieved a resolution suitable for practical crack width measurements.

Conclusions:

  • The proposed unstressed patch antenna design offers a viable solution for passive wireless crack sensing.
  • The sensor provides accurate and reliable crack width measurements for structural monitoring applications.