The ESC0380 from Star Microwave is a RF & Microwave Circulator with Frequency 3.4 to 4.2 GHz, Average Power Forward 50 W, Insertion Loss 0.4 dB, Isolation 20 dB, Operating Temperature -30 to 85 Degree C. Tags: Coaxial Circulator. More details for ESC0380 can be seen below.