The ZCDC20-5R263-S+ from Mini Circuits is a Directional Coupler with Frequency 0.5 to 26.5 GHz, Coupling 20 dB, Coupling Variation ±1.7 dB, Directivity 13 to 31 dB, Average Power 20 W. Tags: Module with Connectors. More details for ZCDC20-5R263-S+ can be seen below.