Cylindrical electromagnetic external cloak with only axial material parameter spatially variant

Electromagnetic external cloak is an important device, which can make an object outside its domain invisible, meanwhile the object can exchange information with the outer region. Based on optical transformation method, we design a simplified cylindrical electromagnetic external cloak with only axial material parameter spatially variant in this paper. The general expressions of material parameters are derived, and then the performance of the external cloak is simulated using the full wave simulations. The advantage of this external cloak is that transverse material parameters are constants, which makes it easier to realize with two-dimensional metamaterials. Besides, the effects of loss and perturbations of parameters on the performance of the cloak are also investigated. This work provides a feasible way for the fabrication of the metamaterial-assisted external cloak.

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