The QMC-CRYOCOUPLER-30 from Quantum Microwave is a Directional Coupler with Frequency 3.4 to 12.3 GHz, Coupling 30 dB, Coupling Variation 1 dB, Directivity 15 dB, Average Power 3 W. Tags: Module with Connectors. More details for QMC-CRYOCOUPLER-30 can be seen below.