In this paper, we develop a method to homogenize split-ring arrays in the frequency domain. The expected
resonance and negative permeability are obtained via numerical simulations with the finite elements method.
A subtle modelization of the split-ring with a closed ring pemits us to avoid meshing the small split, while
maintaining the resonant behaviour of this metamaterial. Therefore, our homogenization technique simulates
these metamaterials with a minimal computational cost. Simulations were made for several ring orientations,
dimensions and shapes.
In this paper we explore both theoretically and experimentally the electromagnetic properties of microwave photonic band gap structures formed by several layers of doubly periodic arrays of conducting elements. The experimental results are in good agreement with the theoretical calculations. The method of the analysis of a single doubly-periodic array of conducting strips, based on Floquet theorem and the moments method, is combined with a recursive algorithm suitable to calculate the reflection and transmission operators for a system of several such layers. These structures can find practical applications in high- quality polarization-selective filters.
Numerical and experimental results on the scattering of an electromagnetic plane wave by an array of novel planar chiral particles are presented in this paper. The geometry of the particles are chosen in order to obtain a depolarization of the scattered wave on a broad frequency band. We also present results corresponding to arrays with the chiral particles connected to passive linear electronic loads. By varying the loads, we demonstrate, theoretically and experimentally, that the properties of depolarization can be electronically controlled. These results suggest a potential application of the studied samples in the design of agile polarization transformers.
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