The RFDC5M40G30 from RF-Lambda is a Directional Coupler with Frequency 0.5 to 40 GHz, Coupling 28.5 to 31.5 dB, Frequency Sensitivity ±0.7 to ±1 dB, Directivity 8 to 12 dB, Average Power 20 W. Tags: Module with Connectors. More details for RFDC5M40G30 can be seen below.