An agile microwave bandpass filter having an input port (12) and an output port (13) and having a plurality of parallel-coupled cylindrical two-mode cavities (1, 2) of adjustable volume that have parallel axes, each cavity having an end face perpendicular to the cylindrical cavity axis at one end of said cavity, one of the cavities being coupled to the other via an iris (19), said input port of said filter being located in said end face on one of said cylindrical cavities and said output port of said filter being located in said end face of another of said cylindrical cavities, to thereby obtain a symmetrical frequency response.
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