The JCD3300T3800M0-II from JQL Electronics is a RF & Microwave Circulator with Frequency 3.3 to 3.8 GHz, Average Power Forward 5 W, Insertion Loss 0.4 dB, Isolation 20 dB, Operating Temperature -35 to 85 Degree C. Tags: Drop-in Circulator. More details for JCD3300T3800M0-II can be seen below.