The SMI-1721 from Sierra Microwave Technology is a RF & Microwave Isolator with Frequency 1.7 to 2.1 GHz, Average Power Reverse 2 W, Insertion Loss 0.4 dB, Isolation 20 dB, Operating Temperature -54 to 85 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for SMI-1721 can be seen below.