The AT11B-020040M-AF from Aaren Technology Ltd is a RF & Microwave Circulator with Frequency 2 to 4 GHz, Average Power Forward 100 W, Insertion Loss 0.6 dB, Isolation 17 dB, Operating Temperature 0 to 60 Degree C. Tags: Coaxial Circulator. More details for AT11B-020040M-AF can be seen below.