The SMC-1822 from Sierra Microwave Technology is a RF & Microwave Circulator with Frequency 18 to 22 GHz, Average Power Reverse 2 to 150 W, Insertion Loss 0.4 dB, Isolation 20 dB, Operating Temperature -54 to 85 Degree C. Tags: Coaxial Circulator. More details for SMC-1822 can be seen below.