The COI27310620D from Cernex Inc is a RF & Microwave Isolator with Frequency 27 to 31 GHz, Average Power Forward 5 W, Insertion Loss 0.6 dB, Isolation 20 dB, Operating Temperature -20 to 65 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for COI27310620D can be seen below.