The RFCR2511 from RF-CI is a RF & Microwave Circulator with Frequency 1.8 to 1.88 GHz, Average Power Forward 200 W, Average Power Reverse 200 W, Peak Power 1000 W, Insertion Loss 0.2 to 0.3 dB. Tags: Drop-in Circulator. More details for RFCR2511 can be seen below.