The C-4S63U-70 from Teledyne Microwave Solutions is a RF & Microwave Circulator with Frequency 4.5 to 9.0 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-4S63U-70 can be seen below.