The DBDC1003400420A from Qotana is a Directional Coupler with Frequency 3.4 to 4.2 GHz, Coupling 9 to 11 dB, Frequency Sensitivity ±0.5 to 0.7 dB, Directivity 20 to 22 dB, Average Power 50 W. Tags: Module with Connectors. More details for DBDC1003400420A can be seen below.