The C-3S63U-20 from Teledyne Microwave Solutions is a RF & Microwave Circulator with Frequency 3.5 to 7.0 GHz, Average Power Forward 50 W, Peak Power 1000 W, Insertion Loss 0.5 dB, Isolation 17 dB. Tags: Coaxial Circulator. More details for C-3S63U-20 can be seen below.