The RFCR5553 from RF-CI is a RF & Microwave Circulator with Frequency 1.88 to 1.93 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 RFCR5553 can be seen below.