The MMCCC640A from Mesa Microwave is a RF & Microwave Circulator with Frequency 1 to 2 GHz, Bandwidth 1000 MHz, Average Power Forward 100 W, Average Power Reverse 100 W, Insertion Loss 0.6 dB. Tags: Module with Connectors, Coaxial Circulator. More details for MMCCC640A can be seen below.