The RMIS20.4200-5500Nf from Response Microwave Inc is a RF & Microwave Isolator with Frequency 4.2 to 5.5 GHz, Insertion Loss 0.5 dB, Isolation 20 dB. Tags: Module with Connector, Coaxial Isolator. More details for RMIS20.4200-5500Nf can be seen below.