Abstract: With the general expression for an arbitrarily simple-shaped scatterer's scattering characteristics as a starting point, the RCS varieties during the respective change of each parameter are analyzed. By these we can get the RCS of the prototype scatterer not only after the scaling of the RCS values in model measurement by means of the similarities, but also when the ideal scaling relation are not satisfied because of the limitation of experimental conditions. The latter result has established an academic basis for the extrapolation of the scattering frequency characteristic curves, and provided a new approach to the frequency range expansion of the RCS scaling measurement equipments.

Key words: frequency characteristics, RCS, scaling measurement, electromagnetic similarity