The RADI-8-12-Cryo-4-77K-S3-1WR-b from Raditek is a RF & Microwave Circulator with Frequency 8 to 12 GHz, Average Power Forward 1 W, Average Power Reverse 1 W, Insertion Loss 0.6 dB, Isolation 17 dB. Tags: Coaxial Circulator. More details for RADI-8-12-Cryo-4-77K-S3-1WR-b can be seen below.