The T27F1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 27.5 to 29.7 GHz, Average Power 0.01 W, Average Power Forward 0.01 W, Insertion Loss 0.6 dB, Isolation 15 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T27F1 can be seen below.