The RFC27-200 from RF-Lambda is a RF & Microwave Circulator with Frequency 2.98 to 3.72 GHz, Bandwidth 740 MHz, Average Power Forward 200 W, Average Power Reverse 200 W, Insertion Loss 0.2 to 0.5 dB. Tags: Coaxial Circulator. More details for RFC27-200 can be seen below.