The T18G1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 18 to 22 GHz, Average Power 0.5 W, Average Power Forward 0.5 W, Insertion Loss 0.5 dB, Isolation 22 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T18G1 can be seen below.