The ATc6-18 from Narda-ATM is a RF & Microwave Circulator with Frequency 6 to 18 GHz, Average Power Forward 2 W, Peak Power 20 W, Insertion Loss 0.9 to 1 dB, Isolation 14 to 15 dB. Tags: Coaxial Circulator. More details for ATc6-18 can be seen below.