The SMI-4565 from Sierra Microwave Technology is a RF & Microwave Isolator with Frequency 4.5 to 6.5 GHz, Insertion Loss 0.4 dB, Isolation 20 dB, Operating Temperature -20 to 65 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for SMI-4565 can be seen below.