The SMC-2531 from Sierra Microwave Technology is a RF & Microwave Circulator with Frequency 25 to 31 GHz, Average Power Reverse 2 to 150 W, Insertion Loss 0.7 dB, Isolation 17 dB, Operating Temperature -20 to 65 Degree C. Tags: Coaxial Circulator. More details for SMC-2531 can be seen below.