The IC 1.3 from TKI-Ferrit is a RF & Microwave Isolator with Frequency 1.2 to 1.4 GHz, Average Power Forward 100 W, Insertion Loss 0.3 dB, Isolation 23 dB, Operating Temperature -10 to 70 Degree C. Tags: Module with Connectors, Coaxial Isolator. More details for IC 1.3 can be seen below.