The IC 6.4 aat v.9 from TKI-Ferrit is a RF & Microwave Isolator with Frequency 6.2 to 6.6 GHz, Average Power Forward 1 W, Insertion Loss 0.5 dB, Isolation 21 dB, Operating Temperature -40 to 85 Degree C. Tags: Module with Connectors, Coaxial Isolator. More details for IC 6.4 aat v.9 can be seen below.