The CU4S0506BC-1900-00 from TDK is a RF & Microwave Circulator with Frequency 1.88 to 1.92 GHz, Bandwidth 40 MHz, Average Power Forward 5 W, Insertion Loss 0.7 dB, Isolation 15 dB. Tags: Surface Mount, Surface Mount Circulator. More details for CU4S0506BC-1900-00 can be seen below.