The RFDC1G18G20 from RF-Lambda is a Directional Coupler with Frequency 1 to 18 GHz, Coupling 19 to 21 dB, Frequency Sensitivity ±0.7 to ±1 dB, Directivity 12 to 20 dB, Average Power 50 W. Tags: Module with Connectors. More details for RFDC1G18G20 can be seen below.