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Microwave metamaterial sensor with a high Q factor to measure complex permittivity based on cross-polarization
Optics Express
|June 14, 2025
Summary
A novel solid-state sensor utilizes cross-polarization conversion in the microwave band to accurately measure complex permittivity. This metamaterial sensor achieves high polarization conversion ratio and Q-factor for advanced sensing applications.
Area of Science:
- Metamaterials
- Microwave Engineering
- Sensor Technology
Background:
- Cross-polarization conversion is crucial for advanced wave manipulation.
- Metamaterial-based sensors offer unique capabilities for material characterization.
- Developing high-performance microwave sensors remains an active research area.
Purpose of the Study:
- To propose and validate a novel solid-state complex permittivity sensor.
- To leverage cross-polarization conversion in the microwave band for sensing.
- To demonstrate the sensor's effectiveness for material analysis.
Main Methods:
- Design of a sensor based on a circular split-ring resonator, F4B dielectric substrate, and metal backplate.
- Utilizing anisotropy theory to analyze polarization conversion characteristics.
- Experimental verification of complex permittivity sensing with two materials under test.
Main Results:
- Achieved a 95.5% polarization conversion ratio (PCR) at 13.35 GHz.
- Obtained a high Q-factor of 76.87.
- Experimental and simulation results for complex permittivity sensing showed strong agreement.
Conclusions:
- The proposed sensor demonstrates effective complex permittivity sensing capabilities.
- The design exhibits narrow-band cross-polarization conversion, high Q-factor, and wide incidence angle tolerance.
- This work provides valuable guidance for metamaterial sensor development.
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