The UIYBDC4040B from UIY Inc. is a RF & Microwave Circulator with Frequency 185 MHz to 3.8 GHz, Average Power Forward 200 W, Average Power Reverse 200 W, Insertion Loss 0.7 dB, Isolation 17 dB. Tags: Drop-in Circulator. More details for UIYBDC4040B can be seen below.