The RFDC1G4G20-RT from RF-Lambda is a Directional Coupler with Frequency 1 to 4 GHz, Coupling 19 to 21 dB, Frequency Sensitivity ±0.5 to ±0.7 dB, Directivity 20 to 25 dB, Average Power 50 W. Tags: Module with Connectors. More details for RFDC1G4G20-RT can be seen below.