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We present here a 3-D E-B linear eigenmode formulation for the analysis of periodic structures, including lossy periodic waveguides, photonic crystals, and metamaterials. The proposed finite-element formulation utilizes proper $H$ (curl) vector basis functions for the electric field and $H$ (div) vector basis functions for magnetic flux density. The resulting eigenmode problem is linear, and it...
The finite-difference time-domain method is herein combined with polynomial-chaos expansions for the study of axially-symmetric structures featuring material uncertainties. By exploiting the problem's periodicity, we reduce the high computational burden of fully 3D simulations, and reliably extract the necessary statistical information from a single simulation.
We present an E-B linear eigenmode formulation for the analysis of periodic structures, including lossy periodic waveguides, photonic crystals and metamaterials. The proposed formulation does not exhibit spurious modes and can provide accurate complex-k dispersion diagrams for both propagating and evanescent modes, including those with oblique propagation.
The propagating modes on a magnetically biased curved graphene microstrip are thoroughly examined in the present work by means of an efficient finite element modal solver. The influence of the anisotropic surface conductivity due to the magnetic bias is carefully addressed and investigated through a multitude of numerical results, including the effective index and the electric field distribution of...
The consistent analysis of complex antenna setups with statistically varying media attributes is performed in this paper through a 3-D curvilinear stochastic finite-difference time-domain technique. The new method generalizes the concept of covariant/contravariant metrics for curved structures and derives the mean value and standard deviation of field components in a single run. Also, for the acceleration...
In the present paper, a simplified human body, stroked by a lightning touch voltage, is implemented via lumped elements and analysed through the finite-difference time-domain (FDTD) method. The results, so extracted, are compared with those of an electronic circuit simulator. Furthermore, the current induced to the human body in the vicinity of a lightning stroked object, is accurately calculated...
A further example of multi-band absorption using ultra-thin, polarization-insensitive, wide-angled metamaterial absorbers that operate in multi-frequency bands within the microwave regime is presented in this work. The basic structure geometry is utilised to create multi-band highly absorbing structures by incorporating the scalability property of the metamaterials. Simulation results verify the structure’s...
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