The JCM2900T3100S6R from JQL Electronics is a RF & Microwave Circulator with Frequency 2.9 to 3.1 GHz, Average Power Forward 60 W, Insertion Loss 0.45 dB, Isolation 20 dB, Operating Temperature -40 to 85 Degree C. Tags: Surface Mount Circulator. More details for JCM2900T3100S6R can be seen below.