The QDC1822D from Qualwave is a RF & Microwave Circulator with Frequency 4000 to 5000 MHz, Bandwidth 1000 MHz, Average Power Forward 60 W, Insertion Loss 0.40 dB, Isolation 18 to 23 dB. Tags: Drop-In, Drop-in Circulator. More details for QDC1822D can be seen below.