The WVI-19.25G-2.5GBW01 from Wevercomm is a RF & Microwave Isolator with Frequency 18 to 20.5 GHz, Average Power Forward 1 W, Insertion Loss 0.5 dB, Isolation 18 dB, Return Loss 20 dB. Tags: Module with Connectors, Coaxial Isolator. More details for WVI-19.25G-2.5GBW01 can be seen below.