The ZDDC20-K1844 from Mini Circuits is a Dual Directional Coupler with Coupling 20 dB, Coupling Variation ±0.3 to 0.7 dB( Flatness), Frequency 18 to 40 GHz, Power 20 W, Insertion Loss 0.6 to 1.4 dB. Tags: Module with Connectors. More details for ZDDC20-K1844 can be seen below.