The SMI-3783 from Sierra Microwave Technology is a RF & Microwave Isolator with Frequency 3.7 to 8.3 GHz, Insertion Loss 0.5 dB, Isolation 18 dB, Operating Temperature -30 to 70 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for SMI-3783 can be seen below.