The QSDC-400-18000-50 from Qualwave is a Directional Coupler with Frequency 0.4 to 18 GHz, Coupling 10 to 20 dB, Directivity 10 dB, Average Power 50 W, Insertion Loss 1.5 dB. Tags: Module with Connectors. More details for QSDC-400-18000-50 can be seen below.