The ZDC10-20403-K+ from Mini Circuits is a Directional Coupler with Frequency 20 to 40 GHz, Coupling 10 dB, Coupling Variation ±1.1 dB, Directivity 7 to 14 dB, Average Power 20 W. Tags: Module with Connectors. More details for ZDC10-20403-K+ can be seen below.