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In this work, scattering fields of the constant impedance sphere is investigated by using series expansion of the incident and the scattering fields for different frequencies and radii of the impedance sphere. Unknown coefficients in the scattering fields are found by using impedance boundary condition. We consider the impedance sphere is illuminated by plane wave that travel along z direction. The general expressions of the scattered fields are obtained and calculated on the z=2.5 m plane (3 m x 3 m) for different frequencies and radii of the impedance sphere.