The QDDC-18000-40000-30-20-K from Qualwave is a Dual Directional Coupler with Coupling 20 dB, Coupling Variation ±2 dB, Frequency 18000 to 40000 MHz, Average Power 30 W, Insertion Loss 2.2 dB. Tags: Module with Connectors. More details for QDDC-18000-40000-30-20-K can be seen below.