Mica and PTFE Capacitors

Capacitors incorporating mica or PTFE (Teflon®) dielectrics are used in applications that require good parametric stability, low losses, and relatively high voltage ratings. An electrostatic (non-polarized) capacitor type, the tradeoff for these desirable characteristics are relatively high cost and a limited range of available capacitance values, generally of a few tens of nanofarads or less.