The JIC18K0T21K2SMSF1 from JQL Electronics is a RF & Microwave Isolator with Frequency 18 to 21.2 GHz, Average Power Forward 10 W, Average Power Reverse 1 W, Insertion Loss 0.5 dB, Isolation 18 dB. Tags: Module with Connector, Coaxial Isolator. More details for JIC18K0T21K2SMSF1 can be seen below.