The MMCCC120A from Mesa Microwave is a RF & Microwave Circulator with Frequency 8 to 20 GHz, Bandwidth 500 to 2000 MHz, Average Power Forward 50 W, Average Power Reverse 50 W, Insertion Loss 0.3 to 0.4 dB. Tags: Module with Connectors, Coaxial Circulator. More details for MMCCC120A can be seen below.