The DBIS1802000400B from Qotana is a RF & Microwave Isolator with Frequency 2 to 4 GHz, Average Power Forward 50 W, Average Power Reverse 5 W, Insertion Loss 0.4 to 0.5 dB, Isolation 18 to 19 dB. Tags: Module with Connector, Coaxial Isolator. More details for DBIS1802000400B can be seen below.