The JCD1805T1990M10 from JQL Electronics is a RF & Microwave Circulator with Frequency 1.8 to 1.99 GHz, Average Power Forward 100 W, Insertion Loss 0.35 dB, Isolation 21 dB, Operating Temperature -35 to 85 Degree C. Tags: Drop-in Circulator. More details for JCD1805T1990M10 can be seen below.