The ZDC20K-18-40-10A from ZTS Technologies is a Directional Coupler with Frequency 18 to 40 GHz, Coupling 20 dB, Coupling Variation ±1.25 dB, Directivity 8 dB, Average Power 10 Watts. Tags: Module with Connectors. More details for ZDC20K-18-40-10A can be seen below.