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A Compact Double-Folded Substrate Integrated Waveguide Re-Entrant Cavity for Highly Sensitive Humidity Sensing.

Zhihua Wei1, Jie Huang2, Jing Li1

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This study introduces an ultra-compact humidity sensor using a folded waveguide cavity, achieving 85.9% size reduction. The novel sensor offers high sensitivity and a high Q-factor for various industrial applications.

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folded SIWhumidity sensormicrowavere-entrant cavity resonator

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Area of Science:

  • Electromagnetics and Microwave Engineering
  • Sensor Technology
  • Materials Science

Background:

  • Conventional humidity sensors often lack compactness and high sensitivity.
  • Substrate Integrated Waveguide (SIW) cavities offer potential for miniaturized sensor designs.
  • Resonant methods provide a sensitive approach for detecting environmental parameters.

Purpose of the Study:

  • To propose and analyze an ultra-compact humidity sensor.
  • To achieve significant size reduction compared to traditional SIW cavities.
  • To validate the sensor's performance for humidity detection.

Main Methods:

  • Design of a double-folded SIW re-entrant cavity.
  • Development of a mathematical model based on cavity perturbation theory.
  • Experimental validation using a humidity chamber across a 30%-80% RH range.

Main Results:

  • Achieved up to 85.9% size reduction in the SIW cavity.
  • Established a quantitative relationship between resonant frequency and relative humidity (RH).
  • Measured absolute sensitivity of 135.6 kHz/%RH and normalized sensitivity of 0.00627%/%RH.

Conclusions:

  • The proposed sensor is ultra-compact, highly sensitive, and possesses a high Q-factor.
  • Ease of fabrication and integration are key advantages.
  • The sensor is suitable for humidity sensing in agricultural, pharmaceutical, and food industries.