The DC40-034038SF from Corech Microwave is a Directional Coupler with Frequency 3.4 to 3.8 GHz, Coupling 40 dB, Coupling Variation ±1 dB (Balance), Directivity 18 dB, Average Power 20 W (CW). Tags: Module with Connectors. More details for DC40-034038SF can be seen below.