Bridging enhances filter close-in selectivity

Posted on Jul 6, 2012

General filters are bandpass filters that usually employ bridging couplings between nonadjacent interstage couplings (Reference 1). This class of filters also includes bridging coupling across the filter input and output ports. The implementation of input-to-output bridging already exists for a one-pole filter (Reference 2). For a two-pole filter, dielectric resonators help achieve input-to-output bridging coupling (Reference 3).

You can also implement a two-pole LC-bandpass filter using input-to-output bridging (Figure 1). This general filter provides enhanced close-in selectivity by adding a single bridging inductor across the input and output of a conventional bandpass filter.

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