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|Multilayered CRLH metamaterials using magnetic dipole-like resonant dielectric particles and cut-off TE modes in metallic structures|
|Keywords: metamaterials, dielectric resonators, negative refractive index|
|Recently, left-handed (LH) metamaterials using dielectric resonators (DR) in place of conventional metallic patterned resonators, such as split ring resonators, have been proposed and demonstrated in order to reduce conductor loss at higher frequencies. They can be realized based on mainly three different schemes; one is a two-DR scheme producing both electric and magnetic dipole-like resonances. The second is a one-DR scheme using their mutual magnetic coupling, and the third is one-DR scheme in the negative epsilon background. The first two schemes can be realized with all-dielectric metamaterials without metals, but may suffer from tight fabrication tolerance or undesired multimode excitation. In the present work, we will focus on the last scheme in the microwave region that is a hybrid type with a combination of dielectric and metals, but can avoid the above-mentioned problems. The structure under consideration is composed of arrays of DRs inserted in TE cut-off parallel-plate waveguides. Based on the scheme, 3-D composite right/left handed (CRLH) metamaterial structures can also be designed. They are composed of stacked layers including metallic mesh plates with holes and dielectric layers with 2-D array of DRs. Such a multilayered structure is promising for easy fabrication, compared to other 3-D isotropic metamaterial structures reported previously. It supports balanced CRLH propagation not only in the in-plane direction, but also in the direction normal to the layers. The structure in itself has strong uniaxial anisotropy, but the dispersion diagram and Bloch impedance can have almost isotropic characteristics in a specific frequency region by appropriately designing the configuration parameters.|
|Tetsuya Ueda, Assistant Professor
Kyoto Institute of Technology
Kyoto, Kyoto Prefecture