The QDC3838X from Qualwave is a RF & Microwave Circulator with Frequency 350 to 1850 MHz, Bandwidth 106 MHz, Average Power Forward 300 W, Insertion Loss 0.3 to 0.4 dB, Isolation 20 to 23 dB. Tags: Drop-In, Drop-in Circulator. More details for QDC3838X can be seen below.