Spacek Labs Model LPF1-U-15C low pass filter has a pass band from 38 to 64 GHz in WR-19 waveguide with 1.85mm coaxial connectors (waveguide I/O available). The filter is 1.3 inches long and has an Insertion loss of 1.5 dB typical and 2.5 dB max. The rejection at 84 GHz is 30 dB minimum. This proprietary filter design rejects frequencies from 85 to 170 GHz by greater than 40 dB. This series of Spacek Labs filters can be customized to your required frequency and bandwidth from 18 to 110 GHz and can be designed with a sharp cut off as close as 5% of the band edge frequency.
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