The SDI-1721 from Sierra Microwave Technology is a RF & Microwave Isolator with Frequency 1.7 to 2.1 GHz, Average Power Forward 4 W, Peak Power Forward 200 W, Insertion Loss 0.5 dB, Isolation 18 dB. Tags: Drop-In, Drop-In Isolator. More details for SDI-1721 can be seen below.