The RFDC2G4G30 from RF-Lambda is a Directional Coupler with Frequency 2 to 4 GHz, Coupling 30 dB, Frequency Sensitivity ±0.5 to ±0.8 dB, Directivity 20 to 22 dB, Average Power 500 W. Tags: Module with Connectors. More details for RFDC2G4G30 can be seen below.