研究目的
Investigating the characterization of flat samples' electromagnetic constitutive properties using free-space methods in a non-anechoic environment.
研究成果
The paper concludes that the described free-space experimental setup and processing methods effectively characterize material properties, with good agreement between simulations, measurements, and literature. The multi-frequency approach is found to be more robust against noisy data, and Time-Domain Gating is beneficial for frequency-by-frequency methods but may not be necessary for multi-frequency reconstructions.
研究不足
The study is limited by the non-anechoic environment, potential measurement uncertainties, and the need for rigid samples due to the setup design. The accuracy of imaginary parts of permittivity and permeability is challenging for low-loss materials.
1：Experimental Design and Method Selection:
The study employs a free-space experimental setup for characterizing flat samples in the 1–6 GHz range, utilizing frequency-by-frequency and multi-frequency reconstruction algorithms.
2：Sample Selection and Data Sources:
Polymethylmethacrylate (PMMA) and Polytetrafluorethylene (PTFE) samples are used, with measurements taken in a non-anechoic environment.
3：List of Experimental Equipment and Materials:
The setup includes broadband horns with dielectric lenses (model Q-Par WBH1-18S14L) and a Vector Network Analyzer (VNA).
4：Experimental Procedures and Operational Workflow:
The process involves calibration of scattering parameters, application of Time-Domain Gating for signal filtering, and extraction of material properties using different algorithms.
5：Data Analysis Methods:
The analysis includes uncertainty analysis, comparison of extraction methods, and validation against simulations and literature.
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