The ESC0220 from Star Microwave is a RF & Microwave Circulator with Frequency 2.1 to 2.3 GHz, Average Power Forward 150 W, Insertion Loss 0.3 dB, Isolation 20 dB, Operating Temperature -20 to 85 Degree C. Tags: Coaxial Circulator. More details for ESC0220 can be seen below.