The IS-89 from MCLI is a RF & Microwave Isolator with Frequency 19 to 23.5 GHz, Average Power Forward 25 W, Insertion Loss 0.5 dB, Isolation 23 dB, Operating Temperature -54 to 85 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for IS-89 can be seen below.