The MMCCC500B from Mesa Microwave is a RF & Microwave Circulator with Frequency 1.5 to 3 GHz, Bandwidth 1500 MHz, Average Power Forward 200 W, Average Power Reverse 200 W, Insertion Loss 0.5 dB. Tags: Module with Connectors, Coaxial Circulator. More details for MMCCC500B can be seen below.