The ATc11.7-12.7 from Narda-ATM is a RF & Microwave Circulator with Frequency 11.7 to 12.7 GHz, Average Power Forward 2 W, Peak Power 50 W, Insertion Loss 0.15 to 0.2 dB, Isolation 23 to 26 dB. Tags: Coaxial Circulator. More details for ATc11.7-12.7 can be seen below.