Film capacitors are capacitors that use thin film materials as dielectric. This structure mainly consists of two layers of conductive metal foil, sandwiched with a thin film medium, which is usually made of polymer materials such as polyether esters, polypropylene, or polystyrene. The design principle is based on the storage of charges. When voltage is applied to both ends of the capacitor, positive and negative charges accumulate on two layers of metal foil, forming an electric field. Thin film capacitors are renowned for their high stability, low loss factor, and wide operating temperature range, and are particularly suitable for high-frequency circuits. In addition, due to its good self-healing ability, which can self recover after partial breakdown in the dielectric, it has a long service life and high reliability.

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