The UIYCC4550A from UIY Inc. is a RF & Microwave Circulator with Frequency 250 MHz to 1.5 GHz, Average Power Forward 300 W, Average Power Reverse 300 W, Insertion Loss 0.3 dB, Isolation 23 dB. Tags: Coaxial Circulator. More details for UIYCC4550A can be seen below.