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Biaxial Anisotropic Material Development and Characterization using Rectangular to Square Waveguide
AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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The advent of 3-D printing provides a new way to develop complex electromagnetic media. Complex media poses measurement challenges and require new techniques to characterize sample constitutive parameters. A biaxial anisotropic sample is designed using crystallographic symmetry and tensor elements are predicted using equivalent capacitive and inductive lumped elements. Samples are measured using the Waveguide Rectangular to Waveguide Square WRWS cubic sample measurement system. The WRWS system supports the analysis of a cubic biaxial anisotropic sample by measuring the sample in di erent measurement orientations. The orientation S-parameter data is used to extract tensor element permittivites and permeabilities using an analytic, closed-form technique. Research performed in this document demonstrates a sample synthesis methodology, a measurement representative computational electromagnetic CEM prediction of WRWS sample measurements and tests results of an electrically biaxial sample. An uncertainty analysis is also conducted on the experimental data to evaluate potential error sources. The lumped element and CEM predictions agree with the test results. Supplemental discussion also provides a comparison between test data and a free-space simulated results as well as simulated example of an electrically biaxial sample loaded with alumina. These two examples demonstrate the utility of a crystallographic sample design.
APPROVED FOR PUBLIC RELEASE