The T18K1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 18.4 GHz, Average Power 0.5 W, Average Power Forward 0.5 W, Insertion Loss 0.6 dB, Isolation 20 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T18K1 can be seen below.