Resumen

Título: Measuring complex permitivity of materials for frequencies under 18 GHz.
Resumen: This paper describes two systems for the measurement of complex permittivity of solids and other materials for the 100 MHz to 18 GHz frequency range. One system is based on a coaxial probe and the other on the measurement of reflected and transmitted waves with antennas. The dielectric characteristics of Teflon® PTFE and Rexolite 4422 were measured with both systems, compared and a good agreement was found. As will be shown, the open-ended coaxial technique is also appropriate for testing low-loss solids; the free-space technique, mainly used for millimeter and quasi-optical systems, can also be applied for the lower part of the microwave range. Implantation details, as well as material characterization results are provided.
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