Methods of Measuring Permittivity and Permeability of 3D-Printed Samples in a Rectangular Waveguide

PLA (Polylactic Acid) is commonly used for many standard 3D printers, as it does not require a special heated bed or heated chamber. This study presents several methods based on the transmission/reflection (TR) method to measure the permeability and permittivity of a 3D-printed PLA sample. Differently from the traditional TR methods by establishing scattering equations to determine permeability and permittivity of a material, in the new method, the longitudinal phase constant and the TE
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wave impedance are determined from S-parameters of the overall measurement before, then the electromagnetic material properties permittivity and permeability can be calculated using the formula of the TE
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wave impedance.