Sampling of frequency response

1. What is frequency sampling method?
2. What is sampling in frequency domain?
3. What is the sampling frequency in FFT?
4. How do you choose sampling frequency?

What is frequency sampling method?

The frequency sampling method can be used to design a filter with an arbitrary frequency response such as H(ω) . To have simpler mathematical expressions, we can approximate H(ω) using the red curve in the following figure.

What is sampling in frequency domain?

In the frequency domain, sampling of the original signal is described as the convolution of the original signal with a comb function (with peaks repeating at the sampling frequency).

What is the sampling frequency in FFT?

The sampling rate or sampling frequency fs of the measuring system (e.g. 48 kHz). This is the average number of samples obtained in one second (samples per second). The selected number of samples; the blocklength BL. This is always an integer power to the base 2 in the FFT (e.g., 2^10 = 1024 samples)

How do you choose sampling frequency?

The sampling frequency should be at least double the maximum frequency. If your measurement is done in the pass-band (2.38 GHz-2.46 GHz), so the maximum frequency is 2.46 GHz which means that the sampling frequency should be at least 2x2. 46 GHz = 4.92 GHz.