The RC1220CS-109122 from ZTS Technologies is a RF & Microwave Circulator with Frequency 10.9 to 12.2 GHz, Average Power Forward 30 W, Insertion Loss 0.6 dB, Isolation 20 dB, Operating Temperature -10 to 60 Degree C. Tags: Module with Connectors, Coaxial Circulator. More details for RC1220CS-109122 can be seen below.