Design of waveguide bandpass filter based on nonresonating ´T´ junctions

A design method for waveguide bandpass filters based on nonresonating `T` junctions is presented. The wideband characteristics of the nonresonating waveguide `T` junction are fully considered in the design method. As a design example, a four-pole waveguide bandpass filter with about 6` fractional bandwidth has been designed and fabricated. The measured results agree well with the calculated results and it shows good in-band equal ripple performance and sharp rejection performance.