The C-18S33U-20 from Teledyne Microwave Solutions is a RF & Microwave Circulator with Frequency 18.0 to 26.5 GHz, Average Power Forward 50 W, Peak Power 1000 W, Insertion Loss 1 dB, Isolation 17 dB. Tags: Coaxial Circulator. More details for C-18S33U-20 can be seen below.