The MMCCC450A from Mesa Microwave is a RF & Microwave Circulator with Frequency 280 to 1300 MHz, Bandwidth 30 to 850 MHz, Average Power Forward 300 W, Average Power Reverse 300 W, Insertion Loss 0.3 to 0.7 dB. Tags: Module with Connectors, Coaxial Circulator. More details for MMCCC450A can be seen below.