The SMC-1215 from Sierra Microwave Technology is a RF & Microwave Circulator with Frequency 12 to 15 GHz, Average Power Reverse 2 to 150 W, Insertion Loss 0.5 dB, Isolation 20 dB, Operating Temperature -54 to 100 Degree C. Tags: Coaxial Circulator. More details for SMC-1215 can be seen below.