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Filters within any of the bandpass series or combinations of different series may be used to form the basic networks of diplexers or multiplexers.
One terminal of each filter network is common to the assembly, the other terminals remain separate and are isolated from each other. Thus signals applied to the common terminal are separated in accordance with the passband frequencies of the filter networks; Signals applied to the isolated terminals are combined at the common terminal.
The passband of the individual network may be contiguous or separated by overlapping stopbands.
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