The QOT-15 from QuinStar Technology Inc is a Orthomode Transducer with Frequency 50 to 75 GHz, Insertion Loss 0.8 dB, Isolation 28 dB, Return Loss 13.98 dB, Antenna Waveguide Dimension 0.165 Inches (Diameter). More details for QOT-15 can be seen below.