The SFI2731 from Fairview Microwave is a RF & Microwave Isolator with Frequency 27 to 31 GHz, Average Power Forward 5 W, Average Power Reverse 2 W, Peak Power Forward 0.03 kW, Insertion Loss 0.6 dB. Tags: Module with Connector, Coaxial Isolator. More details for SFI2731 can be seen below.