The JCC0390T0450N20 from JQL Electronics is a RF & Microwave Circulator with Frequency 390 to 450 MHz, Average Power Forward 200 W, Insertion Loss 0.4 dB, Isolation 20 dB, Operating Temperature -15 to 60 Degree C. Tags: Coaxial Circulator. More details for JCC0390T0450N20 can be seen below.