The 19594 from Microwave Filter Company is a Ka-band Band Pass Filter with a passband from 35.7 to 40.3 GHz. The filter has an insertion loss of 1 dB and more than 60 dB of rejection @ 33.5 & 44.7 GHz. It is available in a package that measures 2.5 x 0.75 x 0.75 inches with a WR28 waveguide interface. This bandpass filter has been developed for airborne radiometer applications.