The RFCR3908 from RF-CI is a RF & Microwave Circulator with Frequency 3.4 to 4.2 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 RFCR3908 can be seen below.