The RADI-18-26.5-Cryo-(4-77K)-WR42-1WR-b from Raditek is a Waveguide Isolator with Frequency 18 to 27 GHz, Insertion Loss 0.3 to 0.5 dB, Power 1 W, Isolation 18 to 20 dB. Tags: Cryogenic. More details for RADI-18-26.5-Cryo-(4-77K)-WR42-1WR-b can be seen below.