The MMCCC120B from Mesa Microwave is a RF & Microwave Circulator with Frequency 12 to 18 GHz, Bandwidth 6000 MHz, Average Power Forward 50 W, Average Power Reverse 50 W, Insertion Loss 0.6 dB. Tags: Module with Connectors, Coaxial Circulator. More details for MMCCC120B can be seen below.