The DC20-010040SF from Corech Microwave is a Directional Coupler with Frequency 1 to 4 GHz, Coupling 20 dB, Coupling Variation ±1 dB (Balance), Directivity 20 to 22 dB, Average Power 50 W (CW). Tags: Module with Connectors. More details for DC20-010040SF can be seen below.