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In this work we will present new method, retrieved results and validation for complex and frequency dependent permittivity and permeability parameter extraction of two composite, homogeneous and isotropic magnetically loaded microwave absorbers (CR Eccosorb). Permittivity and permeability are extracted from free space transmission measurements for frequencies up to 140GHz. For the results validation, reflection measurements (samples with and without metal backing) are performed and are compared with simulations that use extracted models. The same method is applied in complex and frequency dependent permittivitymodel extractionof commercially available epoxies StycastW19andStycast 2850FT.

Free-Space Transmission Method for the Characterization of Dielectric and Magnetic Materials at Microwave Frequencies