The FMCR1031 from Fairview Microwave is a RF & Microwave Circulator with Frequency 2 to 4 GHz, Average Power Forward 100 W, Average Power Reverse 100 W, Insertion Loss 0.6 dB, Isolation 18 dB. Tags: Coaxial Circulator. More details for FMCR1031 can be seen below.