The CNA-0555 from Stellant Systems is a RF & Microwave Circulator with Frequency 0.475 to 0.55 GHz, Insertion Loss 0.5 dB, Isolation 20 dB, Operating Temperature -20 to 65 Degree C. Tags: Module with Connector, Coaxial Circulator. More details for CNA-0555 can be seen below.