The RFDC2G4G20S from RF-Lambda is a Directional Coupler with Frequency 2 to 4 GHz, Coupling 18.75 to 21.25 dB, Frequency Sensitivity ±0.6 to ±0.75 dB, Directivity 22 to 25 dB, Average Power 50 W. Tags: Module with Connectors. More details for RFDC2G4G20S can be seen below.