The DB20-010180SF from Corech Microwave is a Dual Directional Coupler with Coupling 20 dB (Nominal), Coupling Variation ±1.5 dB (Balance), Frequency 1 to 18 GHz, Average Power 50 W (CW), Insertion Loss 1.60 dB. Tags: Module with Connectors, 50 W, 20 dB Dual-Directional Coupler from 1 to 18 GHz. More details for DB20-010180SF can be seen below.