In Case II, an increasing trend can be observed.
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3D-Printed Low-Cost Dielectric-Resonator-Based Ultra-Broadband Microwave Absorber Using Carbon-Loaded Acrylonitrile Butadiene Styrene Polymer.
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It is also worth noting that, at a low frequency band, i.e., 3–9 GHz, a decreasing trend can apparently be found for the real part of the permittivity.