The RFDC4M3G20N from RF-Lambda is a Directional Coupler with Frequency 400 MHz to 3 GHz, Coupling 19 to 21 dB, Frequency Sensitivity ±0.7 to ±1 dB, Directivity 20 to 22 dB, Average Power 100 W. Tags: Module with Connectors. More details for RFDC4M3G20N can be seen below.