High-Q tunable bandstop filters with adaptable bandwidth and pole allocation

Summary form only given, as follows. Tunable bandstop filters are demonstrated with wide tuning ranges, tunable bandwidth, and a variable number of dynamically allocated poles. The number of poles can be dynamically applied at different frequencies to maximize isolation for a given interference scenario. These filters are made with evanescent-mode cavities which use a new loading post geometry that results in greater external coupling for a given physical coupling aperture size.