The 3G5BG from Renaissance Electronics Corporation is a RF & Microwave Circulator with Frequency 2.3 to 3.8 GHz, Average Power Forward 90 W, Insertion Loss 0.7 dB, Isolation 14 dB, Operating Temperature -20 to 95 Degree C. Tags: Drop-in Circulator. More details for 3G5BG can be seen below.