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ASTM D2520-21
Standard Test Methods for Complex Permittivity (Dielectric Constant) of Solid Electrical Insulating Materials at Microwave Frequencies and Temperatures to 1650 °C
1.1These test methods cover the determination of relative (Note 1) complex permittivity (dielectric constant and dissipation factor) of nonmagnetic solid dielectric materials.
Note 1:The word "relative" is often omitted.
1.1.1Test Method Ais for specimens precisely formed to the inside dimension of a waveguide.
1.1.2Test Method Bis for specimens of specified geometry that occupy a very small portion of the space inside a resonant cavity.
1.1.3Test Method Cuses a resonant cavity with fewer restrictions on specimen size, geometry, and placement than Test Methods A and B.
1.2Although these test methods are used over the microwave frequency spectrum from around 0.5 to 50.0 GHz, each octave increase usually requires a different generator and a smaller test waveguide or resonant cavity.
1.3Tests at elevated temperatures are made using special high-temperature waveguide and resonant cavities.
1.4The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are inch-pound units that are provided for information only and are not considered standard.
1.5This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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