The ATc12-18 from Narda-ATM is a RF & Microwave Circulator with Frequency 12 to 18 GHz, Average Power Forward 2 W, Peak Power 30 W, Insertion Loss 0.45 to 0.5 dB, Isolation 20 to 22 dB. Tags: Coaxial Circulator. More details for ATc12-18 can be seen below.