The SMI-5459H from Sierra Microwave Technology is a RF & Microwave Isolator with Frequency 5.4 to 5.9 GHz, Insertion Loss 0.5 dB, Isolation 46 dB, Operating Temperature -20 to 65 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for SMI-5459H can be seen below.