The ISDJ-25 from MCLI is a RF & Microwave Isolator with Frequency 19 to 21 GHz, Average Power Forward 5 W, Insertion Loss 0.9 dB, Isolation 45 dB, Operating Temperature -20 to 65 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for ISDJ-25 can be seen below.