研究目的
To extract the dielectric constants of different types of dielectric materials using millimetre wave technology based on measurements of the reflection coefficient.
研究成果
The relative permittivity of different types of dielectric materials has been successfully extracted based on monostatic measurements of the reflection coefficient. Results show good agreement between measurements and simulation for nearly all investigated materials and in comparison with published data. Future work will focus on further new sorts and harsh materials.
研究不足
The characterization of materials in the 207 – 247 GHz band is challenging due to a lack of information on material behavior at this frequency band. Small deviations in results might be attributed to material differences and the method of extraction.
1：Experimental Design and Method Selection:
Utilizes a frequency modulated continuous wave (FMCW) radar system with a dielectric lens antenna for monostatic measurements of the reflection coefficient.
2：Sample Selection and Data Sources:
Investigates common materials like Polytetrafluoroethylene (PTFE), Teflon, Polyvinyl Chloride (PVC), and Nylon.
3：List of Experimental Equipment and Materials:
FMCW radar system operating from 207 GHz to 247 GHz, high gain lens antenna, metallic reflector.
4：Experimental Procedures and Operational Workflow:
Measurements are done at different angles of incidence (30°, 35°, 40°, 45°, 50°, 55°, and 60°) with calibration procedures involving match and short measurements.
5：Data Analysis Methods:
Hilbert-Transformation and time gating are applied to the FMCW intermediate frequency signals for calibration.
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