The QDC4545X from Qualwave is a RF & Microwave Circulator with Frequency 300 to 1000 MHz, Bandwidth 300 MHz, Average Power Forward 100 to 400 W, Insertion Loss 0.2 to 0.6 dB, Isolation 18 to 30 dB. Tags: Drop-In, Drop-in Circulator. More details for QDC4545X can be seen below.
