The IS-141 from MCLI is a RF & Microwave Isolator with Frequency 11 to 18 GHz, Average Power Forward 1 W, Insertion Loss 0.35 dB, Isolation 23 dB, Operating Temperature -25 to 80 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for IS-141 can be seen below.