The D4C4450 from DiTom Microwave is a RF & Microwave Circulator with Frequency 4.4 to 5.0 GHz, Average Power Forward 20 W, Peak Power 50 W, Insertion Loss 0.25 dB, Isolation 23 dB. Tags: Coaxial Circulator. More details for D4C4450 can be seen below.