Effects of corrosion on waveguide insertion loss

The proper selection of protective finishes to meet the operational requirements of microwave transmission line is essential for maximum reliability of radar guidance and control systems. This paper discusses changes in insertion loss due to the corrosive effects of acidified hydrogen sulfide gas and salt spray on waveguide surfaces as tested at Sperry. This data indicates that insertion loss is effected by the type and amount of corrosion in the waveguide. The conclusion is drawn that the most efficient protective coating will support a stable microwave signal.