The ATc3-6 from Narda-ATM is a RF & Microwave Circulator with Frequency 3 to 6 GHz, Average Power Forward 2 W, Peak Power 20 W, Insertion Loss 0.35 to 0.4 dB, Isolation 19 to 21 dB. Tags: Coaxial Circulator. More details for ATc3-6 can be seen below.