The SMI-3442H from Sierra Microwave Technology is a RF & Microwave Isolator with Frequency 3.4 to 4.2 GHz, Insertion Loss 1 dB, Isolation 40 dB, Operating Temperature -20 to 65 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for SMI-3442H can be seen below.