Basic characteristics of frequency selective networks
The passband width of the frequency selection circuit is required to be consistent with the effective spectrum width of the transmission signal. Amplitude-frequency characteristics in the passband of an ideal frequency selection circuit 
The amplitude-frequency characteristics outside the passband should meet 
The ideal amplitude-frequency characteristic should be rectangular, that is, a rectangular window function on frequency.
The frequency selection circuit of the rectangular window function is a physically unrealizable system, and the amplitude-frequency characteristic of the actual frequency selection circuit can only be close to rectangular 
The frequency selection circuit of the rectangular window function is a physically unachievable system. The amplitude-frequency characteristic of the actual frequency selection circuit can only be close to the rectangular definition. The rectangular coefficient K0.1 indicates selectivity:
2Δf0.7 is called the passband: 
Obviously, the rectangular coefficient K0.1 = 1 of the ideal frequency selection circuit, while the rectangular coefficients of the actual frequency selection circuit are all greater than 1. 
In addition, in order not to introduce phase distortion of the signal, it is required that the phase frequency characteristics of the frequency selection circuit within the passband should meet
That is, under ideal conditions, each frequency component within the effective frequency bandwidth of the signal is delayed by the same time Ï„, so as to ensure that the relative relationship between each frequency component in the output signal is exactly the same as the input signal.
The phase frequency characteristic curve of the actual frequency selection loop is not a straight line, so the current or terminal voltage of the loop does not have a linear relationship with the phase shift generated by each frequency component, which will inevitably produce phase distortion and cause the frequency selection loop to output the signal Changes in the envelope waveform
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