On-axis Gaussian beam scattering by an object with a chiral inclusion

•Applying the EBCM to the case of an object with a chiral inclusion.•Gaussian beam scattering by an object with a chiral inclusion obtained.•T-matrix relating to the expansion coefficients determined.

A semi-analytical solution to the scattering by an arbitrarily shaped object with a chiral inclusion, for oblique incidence of an on-axis Gaussian beam, is formulated based on the extended boundary condition method. The incident Gaussian beam, scattered fields as well as internal fields are expanded in terms of appropriate spherical vector wave functions, and the unknown expansion coefficients are determined by a system of equations derived from Schelkunoff׳s equivalence theorem and continuous boundary conditions. Numerical results of the normalized differential scattering cross section are presented, and the scattering characteristics are discussed concisely.