The T18F1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 18 to 26.5 GHz, Average Power 1 W, Average Power Forward 1 W, Insertion Loss 0.6 dB, Isolation 17 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T18F1 can be seen below.