The T-5S03U-20 from Teledyne Microwave Solutions is a RF & Microwave Isolator with Frequency 5.4 to 5.9 GHz, Average Power Forward 50 W, Average Power Reverse 2 W, Insertion Loss 0.3 dB, Isolation 26 dB. Tags: Module with Connector, Coaxial Isolator. More details for T-5S03U-20 can be seen below.