The DNF1900-T0135 from Mercury Systems is a RF & Microwave Circulator with Frequency 1.81 to 1.88 GHz, Bandwidth 71 MHz, Average Power Forward 1 W, Insertion Loss 0.3 dB, Isolation 23 dB. Tags: Drop-in Circulator. More details for DNF1900-T0135 can be seen below.