The RFDC5M40G10 from RF-Lambda is a Directional Coupler with Frequency 0.5 to 40 GHz, Coupling 8.5 to 11.5 dB, Frequency Sensitivity ±0.7 to ±1.0 dB, Directivity 8 to 14 dB, Average Power 20 W. Tags: Module with Connectors. More details for RFDC5M40G10 can be seen below.