The QDDC-2000-18000-20-40-S from Qualwave is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation ±1.5 dB, Frequency 2000 to 18000 MHz, Average Power 20 W, Insertion Loss 2 dB. Tags: Module with Connectors. More details for QDDC-2000-18000-20-40-S can be seen below.