What Is a Vacuum Capacitor?
A vacuum capacitor uses a vacuum as its dielectric medium. It features metal plate electrodes separated by a vacuum, enabling charge accumulation when voltage is applied.
This type of capacitor is noted for its high insulation resistance, low loss, robust voltage resistance, and durability. They excel in both high-frequency circuits, where they minimize losses, and high-voltage environments, where they withstand considerable voltages.
Vacuum capacitors are crucial in applications demanding high frequency or voltage, including radio communication, radar systems, power transmission, medical equipment, and precision instruments. They are available in parallel-plate and coaxial cylindrical designs. The parallel-plate model, simpler and easier to produce, has a larger electrode area, whereas the coaxial cylindrical model supports miniaturization but requires more complex manufacturing.