The C-1S13U-40 from Teledyne Microwave Solutions is a RF & Microwave Circulator with Frequency 1.9 to 2.3 GHz, Average Power Forward 50 W, Peak Power 1000 W, Insertion Loss 0.4 dB, Isolation 20 dB. Tags: Coaxial Circulator. More details for C-1S13U-40 can be seen below.