The ZCDC16-K1844+ from Mini Circuits is a Directional Coupler with Frequency 18 to 40 GHz, Coupling 16 dB, Coupling Variation ±1.2 dB, Directivity 11 to 25 dB, Average Power 20 W. Tags: Module with Connectors. More details for ZCDC16-K1844+ can be seen below.