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About Dielectric Ceramics and Substrates
Dielectric ceramics and substrates are electrical insulators with dielectric strength, dielectric constant and loss tangent values tailored for specific device or circuit applications. In capacitor applications, ceramics with a high dielectric constant are used to increase the charge that can be stored. In microelectronic circuits, low dielectric constant or low-k materials are sought to reduce inductive crosstalk and noise generation in the circuit. In high voltage insulator applications, high electrical resistivity (ohm-cm) and high dielectric strength (KV per meter) is required.
Parameters that are important to consider when specifying dielectric ceramics and substrates include dielectric strength, dielectric constant (relative permittivity), loss tangent (tan ), electrical resistivity, and operating frequency. Dielectric strength is the maximum voltage field that the ceramic or material can withstand before electrical breakdown occurs. The dielectric constant is the relative permittivity of a material compared to a vacuum or free space. In dielectric materials, the loss tangent or loss coefficient is the ratio of the imaginary or loss permittivity to the real permittivity of a material. Resistivity is the longitudinal electrical resistance (ohm-cm) of a uniform rod of unit length and unit cross-sectional area. Operating frequency is the frequency range that the material is capable of operating within while providing acceptable performance and/or without excessive power losses.
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Engineering Web: Dielectric Ceramics and Substrates
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Dielectric constant measurements using printed circuit... Dielectric constant measurements using printed circuit techniques at microwave frequencies |
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High Frequency Ceramic Solutions from Johanson Technology Dielectric Characteristics Mechanical Characteristics See Johanson Technology, Inc. Information |
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Influence of strain on the dielectric properties of... Title: Influence of strain on the dielectric properties of Bi?Zn?Ti?Nb?O solid solution thin films Authors: Jin Young Kim, Dong-Wan Kim, Hyun Suk |
