Low-Loss Left-Handed Gammadion-Fishnet Chiral Metamaterials

Fernández, Óscar Fernández; Gómez, Ana Almaraz; Vegas, Α.; Molina‐Cuberos, G. J.; Garcia-Collado, A.J.

doi:10.1109/lawp.2019.2936923

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…Chiral Metamaterials (CMM) is an alternative way for achieving a negative refractive index. In such materials, the chirality parameter, κ, is used to quantify the coupling between the electric and magnetic fields needlessly to induce simultaneously negative 𝜇 and 𝜀. Fernández et al [102] combined the conjugated gammadion (CG) structure and fishnet structure to form a fishnet chiral metamaterial (FCMM) structure with low loss. The FCMM was optimized by including a metallic patch that counterbalances the inductive response of the fishnet wires.…”

Section: B Loss Mitigation Based On Geometric Tailoring Of the Metama...mentioning

confidence: 99%

Overview of Approaches for Compensating Inherent Metamaterials Losses

et al. 2022

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Metamaterials are synthetic composite structures with extraordinary electromagnetic properties not readily accessible in ordinary materials. These media attracted massive attention due to their exotic characteristics. However, several issues have been encountered, such as the narrow bandwidth and inherent losses that restrict the spectrum and the variety of their applications. The losses have become the principal limiting factor when employing metamaterials in real-world applications. Consequently, overcoming them is crucially important and of practical necessity. This paper discusses the practical applications of metamaterials in constructing functional devices and the effects of the losses on such devices. In more depth, it reviews the available approaches for reducing the metamaterial losses developed over the last two decades in the light of available literature. These approaches include the utilization of the principles of electromagnetically induced transparency (EIT), geometric tailoring of the metamaterial structures, and embedding gain materials. Further, computational optimization techniques, such as particle swarm optimization (PSO) and genetic algorithm (GA), are also discussed to design low-loss metamaterials. The EIT-like metamaterial and the including of gain materials are systematic and universal approaches exhibiting low loss approaching zero. In contrast, the other two are not systematic and universal approaches.

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Section: B Loss Mitigation Based On Geometric Tailoring Of the Metama...mentioning

confidence: 99%

Overview of Approaches for Compensating Inherent Metamaterials Losses

et al. 2022

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“…Compared with the single-frequency LH structure in [19], the meta-element with dual-frequency characteristics can provide the basis for subsequent implementation to improve microstrip antennas for dual-frequency coverage. And compared with common LH structures such as those in [20], [21], [22], the proposed design has the following advantages: small size, single-sided, multiple adjustable parameters, easier to produce, easier to integrate into application, and complex venation of natural leaf as template to explore further improvements. For microstrip antennas with topologically similar structures, such as the UWB antennas in [23] and [24], it could be possible for researchers and engineers to apply similar transformation methods to increase the bandwidth at different frequency ranges, which is worthy of further study.…”

Section: Homeomorphic Deformation To Ring-ring Coupled Dual Frequency Lh Structurementioning

confidence: 99%

A Double-Veined Leaf-Shaped Bionic Meta-Element and Array Loading Antennas for Radiation Beam Control

You

et al. 2021

IEEE Access

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Based on bionics, we design and analyze the left-handed (LH) characteristics of metaelements with leaf-shaped structure. The double negative (DNG) frequency band of the initial leaf-shaped LH structure is 5.77-6.17 GHz with a fractional bandwidth of 6.7%. Inspired by two overlapping leaves, and based on topology, we evolve the leaf-shaped LH structure into a line-line coupled double-leaf LH structure. The DNG frequency bands of the line-line coupled LH structure are 2.96-3.86 GHz and 4.14-4.18 GHz. This structure not only retains some of the radiation and reflection properties of the initial design, but also gains new electromagnetic characteristics (an additional DNG frequency band). Finally, the line-line coupled LH structure is further evolved, through mostly homeomorphic deformation, into a ring-ring coupled doubleveined leaf-shaped LH structure. The DNG frequency bands are 3.05-3.81 GHz and 5.31-5.41 GHz, and the fractional bandwidth are 22.2% and 1.9%, respectively. The arc-vein branches form parallel ring-ring coupling with the margin, affecting the structure's impedance and capacitance. Similar to the line-line coupling, it can locally stretch the electromagnetic characteristics, expanding the corresponding DNG bandwidth. Through the establishment of electromagnetic topological set, we classify and analyze the topological transformation and the corresponding changes in electromagnetic characteristics. We then use formula to express the process of topological transformation intuitively. Finally, the ring-ring coupled LH structure is loaded on a microstrip antenna in several different ways, improving the antenna's radiation properties, including bandwidth, directivity, and gain. INDEX TERMS Array loading microstrip antennas, bionics, electromagnetic topological set, left-handed materials, radiation beam control, topological transformation.JINGLIN YOU received the B.S. degree in applied physics from Beihang University (BUAA), Beijing, China, in 2013. He is currently working as education and research assistant at

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