The D19-M1718C01 from QUEST Microwave is a RF & Microwave Circulator with Frequency 1.71 to 1.85 GHz, Average Power Forward 200 W, Average Power Reverse 10 W, Insertion Loss 0.3 dB, Isolation 23 dB. Tags: Drop-in Circulator. More details for D19-M1718C01 can be seen below.