The SMI-1545 from Sierra Microwave Technology is a RF & Microwave Isolator with Frequency 1.5 to 4.5 GHz, Insertion Loss 1 dB, Isolation 14 dB, Operating Temperature -10 to 70 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for SMI-1545 can be seen below.