The ZDDC20-K0644 from Mini Circuits is a Space Qualified Coupler with Frequency 6 to 40 GHz, Coupling 20 dB, Coupling Variation ±0.4 to 1 dB( Flatness), Power 20 W, Directivity 10 to 29 dB. Tags: Module. More details for ZDDC20-K0644 can be seen below.