The RFDC8G40G20 from RF-Lambda is a Directional Coupler with Frequency 8 to 40 GHz, Coupling 19 to 21 dB, Frequency Sensitivity ±0.5 to ±0.7 dB, Directivity 10 to 15 dB, Average Power 20 W. Tags: Module with Connectors. More details for RFDC8G40G20 can be seen below.