On the Benefits of Glide Symmetries for Microwave Devices

Quevedo–Teruel, Oscar; Qiao, Chunming; Mesa, Francisco; Fonseca, Nelson J. G.; Valerio, Guido

doi:10.1109/jmw.2020.3033847

Cited by 66 publications

(34 citation statements)

References 100 publications

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“…In this paper, we investigate the double-mesh twin-wire structure. We demonstrate that the dispersion can be reduced by off-shifting the two wire meshes with half the period in three Cartesian directions, similar to what has been observed in glide-symmetric structures [35][36][37]. We apply this double-mesh twin-wire structure in the design of a fully metallic graded index Luneburg lens.…”

Section: Introductionsupporting

confidence: 69%

“…Similar phenomena are also reported in [33,34], where these disconnected wire meshes are framed into the so-called 'non-Maxwellian' media. As an alternative viewpoint, one may find an analogy to higher symmetries [38][39][40][41], and in particular to glide [37] and 1D twist symmetries [42,43]. When glide symmetries are adequately applied to metasurfaces, they increase the effective refractive index of the unit cells, reduce their dispersion, and increase their isotropy [35,37].…”

Section: Dispersion Analysis Of the Double-mesh Twin-wire Structurementioning

confidence: 99%

“…As an alternative viewpoint, one may find an analogy to higher symmetries [38][39][40][41], and in particular to glide [37] and 1D twist symmetries [42,43]. When glide symmetries are adequately applied to metasurfaces, they increase the effective refractive index of the unit cells, reduce their dispersion, and increase their isotropy [35,37]. These distinctive properties make 2D glide-symmetric structures a suitable candidate for lens applications [20,23,44,45], motivating us to further explore the proposed double-mesh wire medium for 3D meta-lenses.…”

Section: Dispersion Analysis Of the Double-mesh Twin-wire Structurementioning

confidence: 99%

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Three-Dimensional Broadband and Isotropic Double-Mesh Twin-Wire Media for Meta-Lenses

et al. 2021

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Lenses are used for multiple applications, including communications, surveillance and security, and medical instruments. In homogeneous lenses, the contour is used to control the electromagnetic propagation. Differently, graded-index lenses make use of inhomogeneous materials, which is an extra degree of freedom. This extra degree of freedom enables the design of devices with a high performance. For instance, rotationally symmetric lenses without spherical aberrations, e.g., the Luneburg lens, can be designed. However, the manufacturing of such lenses is more complex. One possible approach to implement these lenses is using metamaterials, which are able to produce equivalent refractive indices. Here, we propose a new type of three-dimensional metamaterial formed with two independent sets of wires. The double-mesh twin-wire structure permits the propagation of a first mode without cut-off frequency and with low dispersion and high isotropy. These properties are similar to periodic structures with higher symmetries, such as glide symmetry. The variations of the equivalent refractive index are achieved with the dimension of the meandered wires. The potential of this new metamaterial is demonstrated with simulated results of a Luneburg meta-lens.

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Section: Introductionsupporting

confidence: 69%

Section: Dispersion Analysis Of the Double-mesh Twin-wire Structurementioning

confidence: 99%

Section: Dispersion Analysis Of the Double-mesh Twin-wire Structurementioning

confidence: 99%

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Three-Dimensional Broadband and Isotropic Double-Mesh Twin-Wire Media for Meta-Lenses

et al. 2021

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“…The structures are simulated using the multimodal transfer matrix technique described in [5], [32]- [34]. With this technique, the phase constant, effective refractive index, and dielectric losses can be obtained.…”

Section: D Dielectric Unit Cellmentioning

confidence: 99%

“…The properties of these periodic structures were first studied for onedimensional configurations in the 1960s and 1970s [3], [4]. Recently, the electromagnetic properties of two-dimensional (2D) glide-symmetric structures have been investigated and a number of benefits have been discovered [5]. For example, it has been demonstrated that glide symmetry broadens the bandwidth of the electromagnetic band gaps (EBGs) in holey periodic structures [6].…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Glide-Symmetric Dielectric Structures for Planar Graded-Index Lens Antennas

Poyanco

Zetterström

Castillo‐Tapia

et al. 2021

Antennas Wirel. Propag. Lett.

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In this letter, we propose and study a twodimensional glide-symmetric dielectric periodic structure. We demonstrate that glide symmetry broadens the bandwidth of operation and achieves lower effective refractive indices when compared to non-glide configurations. These two properties are beneficial for producing graded-index lens antennas. To demonstrate the potential of the proposed unit cell, we designed a Luneburg lens operating in the K-and Ka-bands. The lens was manufactured with conventional additive manufacturing and it has a potential use for future wireless communications given its low-cost and low-profile.

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Mode‐Matching Methods

Arndt

2024

Encyclopedia of RF and Microwave Engineering

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The article presents an overview of the state of the art of mode‐matching (MM) methods applied for the rigorous, fast CAD and optimization of waveguide components and describes some recent advances. The great technical importance of the MM technique is its extremely high computational efficiency, achieving complete full‐wave analyses of typical waveguide components orders of magnitude faster than electromagnetics (EM)‐based methods applying space discretization techniques. Hence, the MM technique allows advantageously the direct EM‐based optimization of waveguides components toward given specifications within shortest response times. Hybrid combinations with other EM methods, such as the finite‐element (FE) method and method of moments (MoM), provide extended flexibility. Typical application examples will illustrate the versatility of the MM methods.

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On the Benefits of Glide Symmetries for Microwave Devices

Cited by 66 publications

References 100 publications

Three-Dimensional Broadband and Isotropic Double-Mesh Twin-Wire Media for Meta-Lenses

Three-Dimensional Broadband and Isotropic Double-Mesh Twin-Wire Media for Meta-Lenses

Two-Dimensional Glide-Symmetric Dielectric Structures for Planar Graded-Index Lens Antennas

Mode‐Matching Methods

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