The ATc6-12 from Narda-ATM is a RF & Microwave Circulator with Frequency 6 to 12.4 GHz, Average Power Forward 2 W, Peak Power 20 W, Insertion Loss 0.5 to 0.6 dB, Isolation 17 to 19 dB. Tags: Coaxial Circulator. More details for ATc6-12 can be seen below.