Abstract
Negative refraction has many potential applications in the information and communications technology field. However, the high losses of most negative refraction materials prevent the use of this novel property in the implementation of practical devices in the HF range. In an attempt to overcome this inconvenience, we present two gammadion–fishnet chiral metamaterial structures, constituted by the combination of a lossy chiral metamaterial and different fishnet structures. The electromagnetic characterization of the proposed metamaterials provides a larger bandwidth with negative refraction as well as lower losses when compared with the initial structures. The results were obtained by using both numerical and experimental data, which support our designs.
Highlights
ELECTROMAGNETIC metamaterials (MM) are subwavelength artificial periodic structures engineered to produce effects not present in natural media, such as negative refraction
We propose a way to reduce the losses of a chiral metamaterial structure by adding to the Chiral Metamaterials (CMM) low losses fishnet arrangements [4], [14]
The good agreement reached between measurements and simulations for the Fishnet Chiral Metamaterial (FCMM) case confirms the simulation model
Summary
ELECTROMAGNETIC metamaterials (MM) are subwavelength artificial periodic structures engineered to produce effects not present in natural media, such as negative refraction. We propose a way to reduce the losses of a chiral metamaterial structure (the conjugated gammadion [10]) by adding to the CMM low losses fishnet arrangements [4], [14]. In previous communications [16], [17] two CMM structures were introduced, both showing promising results for reducing losses in the negative refraction region The analysis of this type of gammadion-fishnet chiral structures is taken one step further by a more detailed study of these new designs and a qualitative explanation of the loss reduction mechanism. To support the numerical study, samples of two structures have been manufactured and experimentally characterized Both numerical simulations and experiments data show how the addition of fishnet structures to a conjugated gammadion enlarges the negative refraction bandwidth and decreases the losses compared with the initial structure.
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