The QSDC-18000-40000-20 from Qualwave is a Directional Coupler with Frequency 18 to 40 GHz, Coupling 10 to 30 dB, Directivity 10 dB, Average Power 20 W, Insertion Loss 1.6 dB. Tags: Module with Connectors. More details for QSDC-18000-40000-20 can be seen below.