The QSDC-2000-4000-K4-40-N from Qualwave is a Directional Coupler with Frequency 2000 to 4000 MHz, Coupling 40±1.5 dB, Directivity 10 dB, Average Power 400 W, Insertion Loss 0.5 dB. Tags: Module with Connectors. More details for QSDC-2000-4000-K4-40-N can be seen below.