The QSDC-4000-20000-20-20-N from Qualwave is a Directional Coupler with Frequency 4000 to 20000 MHz, Coupling 20±1 dB, Directivity 10 dB, Average Power 20 W, Insertion Loss 0.6 dB. Tags: Module with Connectors. More details for QSDC-4000-20000-20-20-N can be seen below.