This, combined with low inductance designs, result in capacitors that are ideal for high frequency and RF applications. Specification sheets of mica capacitors commonly show parameters plotted into the gagahertz range. Perhaps more importantly, mica capacitors tend to be bulky a result of the relatively low dielectric constant. This low volumetric efficiency is a serious drawback in many applications such as portable electronic equipment. Some chip mica capacitors are available, but they tend to be expensive.
Mica capacitors are still indispensable in high-power RF transmitter applications.
In the latter case, special rectangular, cylindrical, and button-style cases are used. Another niche is high-voltage applications that are a result of mica s high dielectric breakdown and corona resistance. References Cornell Dubilier is a major manufacturer of capacitors and offers a full line of mica capacitors. The company s website contains a wealth of information on the properties of mica and mica capacitor construction. Custom Electronics. , is a manufacturer of high-voltage mica capacitors.