The MMCCC180A from Mesa Microwave is a RF & Microwave Circulator with Frequency 2 to 4 GHz, Bandwidth 200 to 300 MHz, Average Power Forward 100 W, Average Power Reverse 100 W, Insertion Loss 0.3 to 0.35 dB. Tags: Module with Connectors, Coaxial Circulator. More details for MMCCC180A can be seen below.