The ZDC30S-4-18-50A from ZTS Technologies is a Directional Coupler with Frequency 4 to 18 GHz, Coupling 30 dB, Coupling Variation ±2 dB, Directivity 35 dB, Average Power 50 Watts. Tags: Module with Connectors. More details for ZDC30S-4-18-50A can be seen below.