The T1BF4 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 1.84 to 1.87 GHz, Average Power 100 W, Average Power Forward 100 W, Insertion Loss 0.2 dB, Isolation 30 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T1BF4 can be seen below.