The ability to make object invisibility with a cloak that is fitted to all various shape objects is a long-term aim for investigating optical devices. Invisibility cloak with communication ability illustrated so far generally include a conformal elliptical structure hidden an object that has fixed size, so it is inconvenient for the different shape objects. We therefore seek a non-conformal elliptical complementary cloak with arbitrary axial ratio to solve this issue. The complementary cloak is an elliptical structure composed of three regions, which allows for exchange of information with the outside world without "anti-objects" that is difficult to define.

We investigate a three-dimensional (3D) reciprocal invisibility cloak with a multilayered structure based on coordinate transformation theory and complementary media. There has been considerable research on invisibility cloaks such as the external cloak, which requires complex "anti-objects", and closed cloaks of different shapes, in which the object enclosed is blind. Because all these are hard to realize in actual application, we apply a uniform layer to the whole construct into several parts in efforts to replace the ideal cloak with the aim to reduce complexity in actual fabrication. This multilayered cloak allows exchange of information without requiring "anti-objects". All results were simulated and calculated in the Cartesian coordinate system and with the Comsol Multiphysics software. Electrical field simulations verified the efficiency of the designed cloak and the computed radar cross section (RCS) to illustrate the validity of this method and its efficiency in replacing the ideal cloak.

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