The DC-1843-158 from RF & Noise Components is a RF & Microwave Circulator with Frequency 1.805 to 1.88 GHz, Average Power Forward 250 W, Insertion Loss 0.2 to 0.25 dB, Isolation 23 to 26 dB, Return Loss 23 to 26 dB. Tags: Drop-in Circulator. More details for DC-1843-158 can be seen below.