The MMCCC350A from Mesa Microwave is a RF & Microwave Circulator with Frequency 300 to 1900 MHz, Bandwidth 20 to 1200 MHz, Average Power Forward 300 W, Average Power Reverse 300 W, Insertion Loss 0.3 to 0.5 dB. Tags: Module with Connectors, Coaxial Circulator. More details for MMCCC350A can be seen below.