A Low-Cost Metamaterial Sensor Based on DS-CSRR for Material Characterization Applications.

Area of Science:

• Electromagnetics and Materials Science
• Sensor Technology
• Microwave Engineering

Background:

• Metamaterials offer unique electromagnetic properties not found in natural materials.
• Accurate dielectric characterization is crucial for material science and industrial applications.
• Previous metamaterial sensors faced challenges in sensitivity, cost, or material specificity.

Purpose of the Study:

• To develop and validate a metamaterial sensor for precise dielectric measurements.
• To utilize a double slit complementary square ring resonator (DS-CSRR) for enhanced sensor performance.
• To demonstrate the sensor's capability in characterizing coal powder and other dielectric materials.

Main Methods:

• Design and optimization of a DS-CSRR metamaterial structure for deep notch depth.
• Extraction of metamaterial properties (negative permittivity and permeability) from S-parameters.
• Fabrication of the sensor using low-cost FR-4 PCB material.
• Calibration using known materials and subsequent dielectric measurement of coal samples.

Main Results:

• The optimized DS-CSRR sensor exhibited a deep notch of -41 dB at a resonance frequency of 4.75 GHz.
• Simulated and measured results showed excellent agreement.
• The sensor accurately determined the dielectric constants of Anthracite (3.5) and Bituminous (2.52) coal powders.

Conclusions:

• The proposed DS-CSRR metamaterial sensor is a simple, effective, and non-destructive technique for dielectric material characterization.
• The sensor demonstrates high performance and potential for various material testing applications.
• This approach offers a cost-effective solution for precise dielectric measurements.