Hexagonal shaped reciprocal external cloak with homogeneous material properties

Based on the concept of transformation optics and complementary media, a hexagonal shaped reciprocal external cloak is proposed which hides an object inside it perfectly. The hexagonal shape has been sub-divided into regions of rectangular and triangular shapes. The rectangular sub-regions have diagonal material properties whereas the triangular sub-regions have complete anisotropic tensor properties. The advantage of proposed cloak is that the material properties are homogeneous within all sub-regions. The other advantage is that its cloaked area can be increased without any change in material parameters. Full-wave simulations reveal that the proposed cloak has good performance even for hiding multiple objects of different shapes and sizes inside it.