The RFDC1G4G30 from RF-Lambda is a Directional Coupler with Frequency 1 to 4 GHz, Coupling 29 to 31 dB, Frequency Sensitivity ±0.7 dB, Directivity 20 to 21 dB, Average Power 50 W. Tags: Module with Connectors. More details for RFDC1G4G30 can be seen below.