The QMC-CRYOCOUPLER-40 from Quantum Microwave is a Directional Coupler with Frequency 3.4 to 12.3 GHz, Coupling 40 dB, Directivity 15 dB, Average Power 3 W, Insertion Loss 0.5 dB. Tags: Module with Connectors, Cryogenic. More details for QMC-CRYOCOUPLER-40 can be seen below.