The RFCR3913 from RF-CI is a RF & Microwave Circulator with Frequency 5.7 to 6.8 GHz, Average Power Forward 50 W, Average Power Reverse 35 W, Peak Power 500 W, Insertion Loss 0.40 to 0.50 dB. Tags: Coaxial Circulator. More details for RFCR3913 can be seen below.