The RFCR5907 from RF-CI is a RF & Microwave Circulator with Frequency 4.2 to 4.4 GHz, Average Power Forward 30 W, Average Power Reverse 30 W, Peak Power Forward 500 W, Insertion Loss 0.3 dB. Tags: Surface Mount, Surface Mount Circulator. More details for RFCR5907 can be seen below.