The RFDC8G18G30B from RF-Lambda is a Directional Coupler with Frequency 8 to 18 GHz, Coupling 29 to 31 dB, Frequency Sensitivity ±0.5 to ±0.8 dB, Directivity 10 to 12 dB, Average Power 300 W. Tags: Module with Connectors. More details for RFDC8G18G30B can be seen below.