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Validation of 4–40 GHz free-space permittivity measurements using dielectric resonators

Previously, a simple transmission-only method was applied to extract the complex permittivity of common building materials in the 4–40 GHz range using a low-cost anechoic chamber and a vector network analyzer. This technique is validated using small dielectric resonators fabricated from the same materials as used in the free-space measurements. Agreement of the two methods indicates acceptable accuracy of the developed techniques. Measurement of Teflon, a well characterized material at microwave and millimeter-wave frequencies, is also reported, further validating these methods.