The QSDC-2000-4000-K3-20-NS from Qualwave is a Directional Coupler with Frequency 2000 to 4000 MHz, Coupling 20±1 dB, Directivity 18 dB, Average Power 300 W, Insertion Loss 0.4 dB. Tags: Module with Connectors. More details for QSDC-2000-4000-K3-20-NS can be seen below.