The SDI-1819 from Sierra Microwave Technology is a RF & Microwave Isolator with Frequency 1.8 to 1.88 GHz, Average Power Forward 4 W, Peak Power Forward 200 W, Insertion Loss 0.3 dB, Isolation 25 dB. Tags: Drop-In, Drop-In Isolator. More details for SDI-1819 can be seen below.