MIWAVE 410 Series Waveguide to Coax Adapter, Frequency Range: 50-75GHz, Insertion Loss: 0.5dB(Typ), VSWR: 1.3:1(Typ), Configuration: Right Angle Type, Coaxial Port: 1.85mm Female, Waveguide Port: WR-15 Waveguide with UG-385/U Flange, Note: Performance degrades above 67 GHz with 1.85mm F Coaxial