Silver mica capacitor

A mica capacitor is an electrical capacitor with the material mica as a dielectric.

Mica is a naturally occurring mineral with high dielectric strength and having a layer structure. It consists of potassium aluminum silicates with chemically bound water of crystallization and is cleaved into thin flakes down to about 0.02 mm thickness. Mica was quite early used from about 1920 in the Electronics as the dielectric of capacitors and has even today, especially in the United States, as Silver mica capacitor ( Mica:. Engl for mica) a certain importance. Mica capacitors are used because of the low temperature coefficient of the nearly frequency-independent loss factor and high dielectric strength in the transmitter technology as a high frequency capacitor, and because of the large temporal capacitance retention in Meßnormalen and filter and oscillator applications for high demands.