The RFCR5552 from RF-CI is a RF & Microwave Circulator with Frequency 1.80 to 1.88 GHz, Average Power Forward 100 W, Average Power Reverse 100 W, Peak Power 500 W, Insertion Loss 0.22 to 0.3 dB. Tags: Surface Mount Circulator. More details for RFCR5552 can be seen below.