The RC1220CS-127149 from ZTS Technologies is a RF & Microwave Circulator with Frequency 12.7 to 14.9 GHz, Average Power Forward 30 W, Insertion Loss 0.5 dB, Isolation 19 dB, Operating Temperature -10 to 60 Degree C. Tags: Module with Connectors, Coaxial Circulator. More details for RC1220CS-127149 can be seen below.