Is the capacitor a high-frequency component

What is a high frequency capacitor?

About High-Frequency Capacitors High-frequency capacitors are marketed as such due to their ability to retain ideal capacitive behavior up to very high frequencies. Capacitors will not exhibit ideal behavior up to the intended operating frequencies in RF systems, even if they are marketed as “high-frequency” or “RF” components.

What happens if a capacitor reaches a high frequency?

At high frequencies, we nd that the reactive portion of the impedance increases and crosses zero at the self-resonant frequency. This behavior is modeled by the capacitor’s series inductance, L s The value of L s is very dependent on how we connect the capacitor’s leads to other components.

What is the merit of a capacitor at high frequency?

The typical fig-ure of merit for a capacitor at high frequencies combines these two effects as effective series resistance (ESR).Figure 2 shows how the values of reactance, Q and ESR vary with frequency. This data is for a Murata 100 pF chip capacitor in an 0805 package.

Do you need discrete capacitors in a high frequency board?

If you need discrete capacitors in a very high frequency board, then you need to account for these values in your circuit model. These values are determined by the following factors: The result is that the above curve is not necessarily observed once the components are placed on a real PCB.

What are the frequency characteristics of a capacitor?

Frequency characteristics of an ideal capacitor In actual capacitors (Fig. 3), however, there is some resistance (ESR) from loss due to dielectric substances, electrodes or other components in addition to the capacity component C and some parasitic inductance (ESL) due to electrodes, leads and other components.

Why do RF capacitors have high Q?

RF capacitors have very high Q due to their low capacitance and very low ESR. Therefore, RF capacitors are often referred to as High Q capacitors. Since RF capacitors are often used for tuning and impedance matching applications, capacitance stability versus temperature is critical.