The JCC4200T4400N2 from JQL Electronics is a RF & Microwave Circulator with Frequency 4.2 to 4.4 GHz, Average Power Forward 20 W, Insertion Loss 0.3 dB, Isolation 23 dB, Operating Temperature -40 to 75 Degree C. Tags: Coaxial Circulator. More details for JCC4200T4400N2 can be seen below.