The ZVDC-20-0123+ from Mini Circuits is a Directional Coupler with Frequency 1 to 20 GHz, Coupling 20 dB, Coupling Variation ±1.0 dB, Directivity 14 to 25 dB, Average Power 20 W. Tags: Module with Connectors. More details for ZVDC-20-0123+ can be seen below.