In the field of communication information, electrolytic capacitors are mainly involved in power management, signal processing and circuit stability. They are used in amplifiers and filters to adjust and smooth signals to ensure signal quality and stability, in radio frequency circuits to match impedance, adjust phase difference and smooth radio frequency signals, and improve the performance of communication equipment. In some communication equipment, temporary charge storage is provided to realize fast data access, isolate different parts of circuits and prevent interference. And improve the stability of the whole circuit. Communication equipment usually needs standby power supply to prevent the failure of the main power supply. Electrolytic capacitors can provide standby power for a short time to ensure the normal operation of communication equipment at the moment of power failure.