The MMCCC190B from Mesa Microwave is a RF & Microwave Circulator with Frequency 8 to 18 GHz, Bandwidth 10000 MHz, Average Power Forward 60 W, Average Power Reverse 60 W, Insertion Loss 0.8 dB. Tags: Module with Connectors, Coaxial Circulator. More details for MMCCC190B can be seen below.