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The optimized design for the illusion device is studied based on the genetic algorithm. For an electrically small target, a core-shell illusion device by optimizing the material and geometrical parameters of the covering shell can achieve the equivalent scattering, in which the monopolar and dipolar modes are dominant. With the increase of the device size, more scattering terms become obvious, and the ability of the single-layered shell to manipulate the scattering is very limited. For a targetdoi:10.21203/rs.3.rs-154259/v1 fatcat:qyyzm4jcx5a7ddxku5wqkfklfm