The ZUDC30-183-S+ from Mini Circuits is a Directional Coupler with Frequency 0.5 to 18 GHz, Coupling 30 dB, Coupling Variation ±3 dB, Directivity 10 to 23 dB, Average Power 50 W. Tags: Module with Connectors. More details for ZUDC30-183-S+ can be seen below.