The QMC-CRYOCOUPLER-20NM from Quantum Microwave is a Directional Coupler with Frequency 4 to 12 GHz, Coupling 20 dB, Directivity 15 dB, Average Power 3 W, Insertion Loss 0.5 dB. Tags: Module with Connectors, Cryogenic. More details for QMC-CRYOCOUPLER-20NM can be seen below.