研究目的
To present a novel one-port probe technique for nondestructively determining the permittivity and permeability of a PEC-backed material by combining the measurements of a rectangular waveguide and coaxial probe.
研究成果
The new single-probe technique presented is ready to be tested on NDE of materials in the field, showing good agreement in results between the proposed method and the destructive TR technique.
研究不足
The technique's sensitivity to common experimental errors such as measured reflection coefficients, MUT thickness, and flange-plate thickness uncertainties.
1：Experimental Design and Method Selection:
The technique combines the reflection measurements of a RWG probe with those of a coaxial probe to yield two independent interrogations of the MUT.
2：Sample Selection and Data Sources:
Material characterization measurements were made at X-band (
3：2–4 GHz) of ECCOSORB SF-3—a lossy silicon-based magnetic material. List of Experimental Equipment and Materials:
Agilent E8362B PNA, WR90 RWG, 7 mm connector hole flange receptacle, locally machined aluminum flange plates.
4：Experimental Procedures and Operational Workflow:
Both the RWG and coaxial probes were calibrated using a thru-reflect-line (TRL) calibration. The MUT's permittivity and permeability were found by minimizing the L2-norm of the difference between the theoretical and measured reflection coefficients using nonlinear least squares.
5：Data Analysis Methods:
The errors in permittivity and permeability were estimated considering uncertainties in measured reflection coefficients, MUT thickness, and flange-plate thickness.
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