The RFDC18G50G20 from RF-Lambda is a Directional Coupler with Frequency 18 to 50 GHz, Coupling 19 to 21.5 dB, Frequency Sensitivity ±0.7 to ±1.0 dB, Directivity 8 to 10 dB, Average Power 20 W. Tags: Module with Connectors. More details for RFDC18G50G20 can be seen below.