What is the primary function of a capacitor in radio interference filtering?

The primary function of a capacitor in radio interference filtering is to provide a low-impedance path for radio frequencies across the source. Capacitors exhibit frequency-dependent behavior; at high frequencies, they effectively act as short circuits, allowing radio frequency signals to pass through. This characteristic helps to bypass and shunt unwanted high-frequency noise to the ground, reducing interference that could affect the performance of the radio equipment.

In this context, the capacitor helps maintain signal integrity by preventing interference from affecting the circuitry. As a result, effective radio interference filtering is achieved, improving the overall clarity and functionality of the communication system.