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Dehbashi, Reza
in Cooperation with on an Cooperation-Score of 37%
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Publications (4/4 displayed)
- 2017Miniaturizing electromagnetic invisibility cloaks using double near zero slabs
- 2017Concealment with near-zero materials and their sensitivity to non-zero material parameters
- 2017Size reduction of electromagnetic devices using double near zero materialscitations
- 2017Half-sized cylindrical invisibility cloaks using double near zero slabs with realistic material size and propertiescitations
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document
Concealment with near-zero materials and their sensitivity to non-zero material parameters
Abstract
Slabs with negative material parameters are used to conceal objects with any shape and material. To conceal an object, it is shown that the size of the object should be large compared to the wavelength, whereas subwavelength objects can be detected. Since a TE_z polarized wave is assumed in this work, both mu-near-zero (MNZ) and epsilon-and-mu-near-zero (EMNZ) slabs are used. For the TM_z waves, the epsilon-near-zero (ENZ) slab should be used. We also investigated how the material parameters should be close to zero so that the slab can still considerably reduce the perturbed waves. We found that for the constitutive parameters of the slab, any value within (-0.01, + 0.01) can considerably reduce the perturbed waves. Finally, we proposed a structure to have that effective material range. Within 8.4-8.45 GHz frequency range, the relative permeability of the structure is in (-0.01,0.01) range, hence it can conceal TE_z waves. Within 10.3-10.33 GHz, the relative permittivity is in the range (-0.01, + 0.01) for the structure therefore it can function as an ENZ slab that can conceal TM_z waves.