The JCC2000T4000N2 from JQL Electronics is a RF & Microwave Circulator with Frequency 2 to 4 GHz, Average Power Forward 20 W, Insertion Loss 0.6 dB, Isolation 16 dB, Operating Temperature -30 to 70 Degree C. Tags: Coaxial Circulator. More details for JCC2000T4000N2 can be seen below.