The ZCDC30-V18443+ from Mini Circuits is a Directional Coupler with Frequency 18 to 44 GHz, Coupling 30 dB, Coupling Variation ±1.6 dB, Directivity 10.0 to 22.5 dB, Average Power 16 W. Tags: Module with Connectors. More details for ZCDC30-V18443+ can be seen below.