The SMI-2531 from Sierra Microwave Technology is a RF & Microwave Isolator with Frequency 25 to 31 GHz, Average Power Reverse 2 W, Insertion Loss 0.7 dB, Isolation 17 dB, Operating Temperature -20 to 65 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for SMI-2531 can be seen below.