The DC-1748-157 from RF & Noise Components is a RF & Microwave Circulator with Frequency 1.71 to 1.785 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-1748-157 can be seen below.