The COI18402109D from Cernex Inc is a RF & Microwave Isolator with Frequency 18 to 40 GHz, Average Power Forward 5 W, Insertion Loss 2.1 dB, Isolation 9 dB, Operating Temperature -20 to 65 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for COI18402109D can be seen below.