The RFDC1G40G20 from RF-Lambda is a Directional Coupler with Frequency 1 to 40 GHz, Coupling 19 to 21.5 dB, Frequency Sensitivity ±0.7 to ±1 dB, Directivity 10 to 14 dB, Average Power 30 W. Tags: Module with Connectors. More details for RFDC1G40G20 can be seen below.