Date：2026-02-05 Categories：Product knowledge Hits：189 From：Guangdong Youfeng Microelectronics Co., Ltd
The impedance of capacitors in high-frequency circuits is mainly composed of their capacitance and resistance. Capacitive impedance is the impedance of a capacitor to an AC signal, which is inversely proportional to frequency. The formula for calculating capacitance is: diode
Xc = 1 / (2πfC)
Among them, Xc is capacitance, f is frequency, and C is capacitance.
The capacitance impedance of a capacitor decreases with increasing frequency, which means that at high frequencies, the impedance of the capacitor to current is smaller. This is because capacitors can store charges and charge and discharge according to changes in current at high frequencies. Therefore, in high-frequency circuits, capacitors are often used as components for transmitting high-frequency signals. diode
In addition to capacitance, capacitors also have a resistance component called DC resistance or AC resistance. The resistance of capacitors mainly comes from the resistance of the dielectric and electrodes. At high frequencies, the resistance of capacitors increases with frequency because the resistance of the dielectric increases with frequency, and the electrodes also generate additional resistance due to the resistance of the wires.
Inductors and capacitors will resonate at specific frequencies. Resonance refers to the state where the impedance of an inductor or capacitor reaches its minimum value. diode
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