The C-12S43U-30 from Teledyne Microwave Solutions is a RF & Microwave Circulator with Frequency 12.0 to 18.0 GHz, Average Power Forward 50 W, Peak Power 1000 W, Insertion Loss 0.5 dB, Isolation 18 dB. Tags: Coaxial Circulator. More details for C-12S43U-30 can be seen below.