The ATc1-2 from Narda-ATM is a RF & Microwave Circulator with Frequency 1 to 2 GHz, Average Power Forward 2 W, Peak Power 20 W, Insertion Loss 0.35 to 0.5 dB, Isolation 15 to 20 dB. Tags: Coaxial Circulator. More details for ATc1-2 can be seen below.