The DB30-105111SF from Corech Microwave is a Dual Directional Coupler with Coupling 30 dB (Nominal), Coupling Variation ±1 dB (Balance), Frequency 10.5 to 11.1 GHz, Peak Power 1 kW, Average Power 30 W (CW). Tags: Module with Connectors, 30 W, 30 dB Dual-Directional Coupler from 10.5 to 11.1 GHz. More details for DB30-105111SF can be seen below.