The ZDDC30-K1844 from Mini Circuits is a Space Qualified Coupler with Frequency 18 to 40 GHz, Coupling 30 dB, Coupling Variation ±0.4 to 0.7 dB( Flatness), Power 20 W, Directivity 10 to 25 dB. Tags: Module. More details for ZDDC30-K1844 can be seen below.