The ZDC20-20403-V+ from Mini Circuits is a Directional Coupler with Frequency 18 to 40 GHz, Coupling 20 dB, Coupling Variation ±1.0 dB, Directivity 7 to 14 dB, Average Power 20 W. Tags: Module with Connectors. More details for ZDC20-20403-V+ can be seen below.