The ZUDC30-83-S+ from Mini Circuits is a Directional Coupler with Frequency 0.3 to 8 GHZ, Coupling 30 dB, Coupling Variation ±2 dB, Directivity 13 to 31 dB, Average Power 50 W. Tags: Module with Connectors. More details for ZUDC30-83-S+ can be seen below.