The ZDC20N-2-4-20A from ZTS Technologies is a Directional Coupler with Frequency 2 to 4 GHz, Coupling 20 dB, Coupling Variation ±1 dB, Directivity 18 dB, Average Power 20 Watts. Tags: Module with Connectors. More details for ZDC20N-2-4-20A can be seen below.