The JCM3500T3700S6R from JQL Electronics is a RF & Microwave Circulator with Frequency 3.5 to 3.7 GHz, Average Power Forward 60 W, Insertion Loss 0.35 dB, Isolation 21 dB, Operating Temperature -40 to 85 Degree C. Tags: Surface Mount Circulator. More details for JCM3500T3700S6R can be seen below.