Basic knowledge of high-frequency characteristics of inductors and capacitors - impedance and resonance 1

Inductors and capacitors are common passive components in circuits, playing an important role in high-frequency circuits. Understanding their high-frequency characteristics is crucial for designing and analyzing high-frequency circuits. This article will introduce the high-frequency characteristics of inductors and capacitors, including impedance and resonance.

The impedance of inductors in high-frequency circuits is mainly composed of their inductance and resistance. Inductive impedance is the impedance of an inductor to an AC signal, which is proportional to frequency. The calculation formula for reactance is:  diode

Xl = 2πfL

Among them, Xl is inductance, f is frequency, and L is inductance.

The inductance of an inductor increases with frequency, which means that at high frequencies, the resistance of the inductor to current becomes stronger. This is because at high frequencies, the current will change direction over time, and the inductor will generate induced electromotive force, making it difficult for the current to pass through. Therefore, in high-frequency circuits, the AD8032ARZ inductor is often used as a component to obstruct the flow of high-frequency signals.diode

In addition to inductance, inductors also have a resistance component called DC resistance or AC resistance. The resistance of an inductor mainly comes from the resistance of the coil and the resistance of the wire. At high frequencies, the resistance of an inductor increases with frequency because the resistance of the wire increases with frequency, and the coil also generates additional resistance due to eddy current effects.diode