From this point the output starts decreasing at a rate of -20dB/Decade and blocking (attenuating) any high frequency signal. The output increases continuously until it reaches to the Upper Cut off Frequency Point ( f high ). At the lower cut-off frequency point ( f low ) the amplitude of the output signal is 70.7% of the input signal. In the frequency response curve or bode plot of the band pass filter, the signal is blocked(attenuated) at low frequencies with the output increasing at the rate of +20dB/Decadeuntil the frequency reaches the Lower Cut off Frequency Point. The values of f high and f low are given by, Where, f high and f low are the higher and lower cut off frequencies. The Bandwidth of band pass filter is given by, This range of band pass filter is known as Bandwidth of the filter. A band pass filter (BPF) is a circuit that passes frequencies within a certain range and rejects all the frequencies outside the range.
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