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Updated: Jun 17, 2025

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

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Chipless RFID Sensor for Measuring Time-Varying Electric Fields Using a Contactless Air-Filled Substrate-Integrated

Amirmasoud Amirkabiri¹, Dawn Idoko¹, Behzad Kordi¹

¹Department of Electrical and Computer Engineering, Price Faculty of Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada.

Sensors (Basel, Switzerland)

|August 10, 2024

Summary

This summary is machine-generated.

This study introduces a wireless chipless resonator sensor using contactless air-filled substrate-integrated waveguide (CLAF-SIW) technology to measure electric fields. The novel sensor achieves long-distance interrogation and measures time-varying electric fields up to 6.9 kV/m.

Keywords:

cavity resonator chipless RFID electric field measurement electromagnetic band gap substrate-integrated waveguide tunable resonator

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Last Updated: Jun 17, 2025

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Area of Science:

Electrical Engineering
Electromagnetics
Sensor Technology

Background:

Accurate measurement of external time-varying electric fields is crucial for various applications.
Existing methods may lack wireless capabilities, long-range interrogation, or compact form factors.

Purpose of the Study:

To develop and demonstrate a wireless, chipless resonator-based sensor for absolute measurement of external time-varying electric fields.
To utilize contactless air-filled substrate-integrated waveguide (CLAF-SIW) technology for enhanced performance.

Main Methods:

The sensor employs a low-impedance electromagnetic band gap structure within an air cavity.
Varactor diodes in the air cavity are modulated by the external electric field, altering the resonant frequency.
Contactless air-filled substrate-integrated waveguide (CLAF-SIW) technology is used for fabrication.

Main Results:

The fabricated CLAF-SIW sensor prototype successfully measured time-varying electric fields up to 6.9 kV/m.
Achieved a sensitivity of 1.86 (kHz)/(V/m) and demonstrated interrogation from 80 cm.
The sensor exhibits a high unloaded quality factor and a feasible bandwidth of 25 kHz.

Conclusions:

The proposed wireless chipless resonator sensor offers a compact, planar, multilayer structure suitable for integration.
It provides a viable solution for long-distance, non-contact measurement of electric fields.
The design can be scaled for reduced size by increasing operating frequency without dielectric loss concerns.