The RFDC4G18G06 from RF-Lambda is a Directional Coupler with Frequency 4 to 18 GHz, Coupling 5.5 to 7 dB, Frequency Sensitivity ±0.5 to ±0.7 dB, Directivity 12 to 17 dB, Average Power 50 W. Tags: Module with Connectors. More details for RFDC4G18G06 can be seen below.