The ATc5.9-6.4 from Narda-ATM is a RF & Microwave Circulator with Frequency 5.9 to 6.4 GHz, Average Power Forward 2 W, Peak Power 20 W, Insertion Loss 0.1 to 0.15 dB, Isolation 23 to 26 dB. Tags: Coaxial Circulator. More details for ATc5.9-6.4 can be seen below.