## How is Q of cavity resonator measured

Q-factor measurement by the cavity resonator method

By measuring RF power from port 1 and port 2 of the metal cavity, scattering matrix S_{21} can be determined with **frequency scan**. S_{21} is the ratio of the voltage measured at port2 compared to the voltage generated at port1.30 Apr 2020

## How is Q factor calculated

The Q factor of the pMUT can be determined by the real part of the impedance frequency spectrum, which is defined as **Q = f _{r}/Δf**, where the resonance frequency f

_{r}is the frequency at which the real part of the impedance reaches its maximum, Δf is the width of the peak at its half height, so-called 3 dB bandwidth.

## How do you find the Q factor of a resonator

**The Q factor of a resonator is related to various other quantities:**

- The Q factor equals 2π times the exponential decay time of the stored energy times the optical frequency.
- The Q factor equals 2π times the number of oscillation periods required for the stored energy to decay to 1/e (≈ 37%) of its initial value.

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## Which method is used for measuring the Q of a cavity resonator

Q-factor measurement by the cavity resonator method

By measuring **RF power** from port 1 and port 2 of the metal cavity, scattering matrix S_{21} can be determined with frequency scan. S_{21} is the ratio of the voltage measured at port2 compared to the voltage generated at port1.30 Apr 2020

## What is the Q of a cavity

The Q factor of the cavity resonator is **the ratio between the stored energy of the cavity to the power loses in the cavity**. If the size of the cavity is made bigger then energy stored will be more and its Q will increase. The Q of the cavity is directly proportional to the frequency of the cavity resonator.

## What is a good Q factor

Good high-Q capacitors can have a Q factor value of **over 10,000 at 1MHz** and over 1,000 at 100MHz, while standard capacitors can have a Q factor as low as 50 at 1kHz.

## What is Q of a cavity resonator

The Q-factor, a short form for Quality factor of a resonator is defined as **the ratio of the amount**. **of energy stored in the cavity and the amount of energy lost per cycle through the walls of the**. **cavity**.

## What is the Q factor of a circuit

The quality factor Q for the circuit is **the electric energy stored in the circuit divided by the energy dissipated in one period.**

## How do you measure Q of a resonator

**The Q factor of a resonator is related to various other quantities:**

- The Q factor equals 2π times the exponential decay time of the stored energy times the optical frequency.
- The Q factor equals 2π times the number of oscillation periods required for the stored energy to decay to 1/e (≈ 37%) of its initial value.

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## What is Q factor formula

Q-factor: In LCR Circuit, the ratio of resonance frequency to the difference of its neighbouring frequencies so that their corresponding current is 1/2 times of the peak value, is called Q-factor of the circuit. Formula: **Q=R1CL**.