The RADC-8.2-12.4-Cryo-(4-77K)-WR90-1WR-b from Raditek is a Waveguide Circulator with Frequency 8.2 to 12.4 GHz, Power 1 W, Isolation 18 dB, Insertion Loss 0.5 dB. Tags: Cryogenic. More details for RADC-8.2-12.4-Cryo-(4-77K)-WR90-1WR-b can be seen below.