The SDC-1819 from Sierra Microwave Technology is a RF & Microwave Circulator with Frequency 1.8 to 1.88 GHz, Average Power Forward 100 W, Average Power Reverse 4 W, Peak Power 1000 W, Insertion Loss 0.3 dB. Tags: Drop-in Circulator. More details for SDC-1819 can be seen below.