An in-line folded microwave filter comprises a plurality of resonant cavities connected in a series between an input and an output at opposite ends of the filter. The resonant cavities are arranged in two parallel sub-series with the signal path proceeding from the input to a first cavity in one sub-series, then to a first cavity in the second sub-series, then to a second cavity in the second sub-series, then to a second cavity in the first sub-series, and so on through the cavities up to the output.
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