In applications such as a particular band, or spread, or frequencies need to be filtered from a wider range of mixed signals. This can be achieved by combining the properties of low-pass and high-pass into a single filter. The result is called a band-pass filter.
The series combination of these two filter circuits is a circuit that will only allow passage of those frequencies that are neither too high nor too low. This type of band-pass filter works by relying on either section to block unwanted frequencies, it can be difficult to design such a filter to allow unhindered passage within the desired frequency range. Both the low pass and high-pass will always block signals to some extent, and their combined effort makes for an attenuated signal at best, even at the peak of the “pass-band” frequency range.
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