The ZDDC20-K0644 from Mini Circuits is a Dual Directional Coupler with Coupling 20 dB, Coupling Variation ±0.4 to 1 dB( Flatness), Frequency 6 to 40 GHz, Power 20 W, Insertion Loss 0.4 to 1.4 dB. Tags: Module with Connectors. More details for ZDDC20-K0644 can be seen below.