The Effect of Flange Loss on the Reflection Coefficient of Reduced-Height Waveguide Reflection Standards

It is shown that when reflection-coefficient standards are constructed from reduced-height waveguide having the plane of the change in height coincident with that of the flange, the flange loss will reduce the calculated reflection coefficient, and for small reflection-coefficient standards (|rho_s|<0.1) and practical flange losses, the effect is more significant than step capacitance which is usually taken into account.