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Dielectric Constant

the property of a dielectric (insulator) which determines the electrostatic energy that can be stored. The higher the constant the higher the energy stored within the capacitor. The dielectric constant affects the properties of transmission lines. The dielectric constant can change with frequency; however, Teflon-based dielectrics are quite constant over a wide frequency range. Common dielectric constants: air = 1; foamed FEP = 1.53; solid PTFE = 2.03; solid polypropylene = 2.18; FR-4 = 4.5