The SMI-3513 from Sierra Microwave Technology is a RF & Microwave Isolator with Frequency 3.5 to 12.8 GHz, Insertion Loss 2.2 dB, Isolation 17 dB, Operating Temperature -20 to 65 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for SMI-3513 can be seen below.