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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

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Published on: August 30, 2012

See through metallic sensor implemented using proximity resonant coupling.

Thamer Almoneef¹, Shehroze Amir², Muhammad Amin³

¹Prince Sattam bin Abdulaziz University, Al-Kharj, Saudi Arabia. t.almoneef@psau.edu.sa.

Scientific Reports

|November 26, 2025

Summary

This summary is machine-generated.

A new ground-less circular patch resonator offers high-sensitivity metal detection up to 8 cm. This sensor selectively detects metallic objects, even through dielectric barriers, by monitoring transmission coefficient changes.

Keywords:

Ground penetrating radars Metal cracks Metal detectors Microwave sensors Proximity detection Resonance See-through wall

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Area of Science:

Electrical Engineering
Electromagnetics
Sensor Technology

Background:

Metal detection is crucial for security and industrial quality control.
Existing methods may lack selectivity or range for certain applications.

Purpose of the Study:

To introduce a novel ground-less circular patch resonator for enhanced metal detection.
To achieve high sensitivity and selectivity exclusively for metallic objects.

Main Methods:

Utilizing electric field coupling between an open stub resonator and metallic targets.
Monitoring changes in the transmission coefficient for detection.
Engineering a circular patch resonator for extended detection range.

Main Results:

Achieved a detection range of up to 8 cm for metallic objects.
Demonstrated selective sensitivity to metallic materials, ignoring dielectric objects.
Observed stronger resonance coupling (frequency shift, -10 dB transmission dip) with decreasing object distance.

Conclusions:

The proposed sensor provides a novel approach for high-sensitivity, selective metal detection.
The design enables 'see-through' metal detection and crack detection in metallic components.
Potential applications include security, industrial inspection, and ground penetration radar (GPR) systems.