The QDDC-18000-26500-30 from Qualwave is a Dual Directional Coupler with Coupling 20 to 30 dB, Coupling Variation ±0.5 dB, Frequency 18000 to 26500 MHz, Average Power 30 W, Insertion Loss 0.9 to 1 dB. Tags: Module with Connectors. More details for QDDC-18000-26500-30 can be seen below.