The RFDC5M40G20 from RF-Lambda is a Directional Coupler with Frequency 0.5 to 40 GHz, Coupling 18.5 to 21.5 dB, Frequency Sensitivity ±0.7 to ±1 dB, Directivity 8 to 14 dB, Average Power 20 W. Tags: Module with Connectors. More details for RFDC5M40G20 can be seen below.