Surface Wave Scattering Reduction Using Beam Shifters

Quarfoth, Ryan; Sievenpiper, Daniel F.

doi:10.1109/lawp.2014.2323361

Cited by 35 publications

(23 citation statements)

References 13 publications

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“…As an example, we have designed a beam shifting structure. Such structures have been designed previously using anisotropic metasurfaces [3]. However, previous work involved homogeneous impedance surfaces because of the difficulty of patterning inhomogeneous anisotropic surfaces.…”

Section: Beam Shifting Patterningmentioning

confidence: 99%

“…It has been used for various applications including control of surface waves [1], [2], scattering [3], conformal antennas [4], and waveguides [5]- [7]. Their electromagnetic properties are defined by the thickness of the substrate, and the capacitance between patches, which together determine the effective surface impedance.…”

Section: Introductionmentioning

confidence: 99%

“…The challenge is how to pattern elongated unit cells which allow high anisotropy, but to also create arbitrary and smoothly varying impedance patterns. All previous work in this area used discrete regions of different impedance values or directions [3], [5].…”

Section: Introductionmentioning

confidence: 99%

“…Fig. 2(d) shows that elongated unit cells [3] can provide a high range of anisotropy, however, these require a rectangular grid. Any design that reduces symmetry of the lattice itself cannot be patterned to include an arbitrarily varying angle of anisotropy.…”

Section: Introductionmentioning

confidence: 99%

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Patterning Technique for Generating Arbitrary Anisotropic Impedance Surfaces

Lee

Sievenpiper

2016

IEEE Trans. Antennas Propagat.

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Abstract-Anisotropic impedance surfaces have been demonstrated to be useful for a variety of applications ranging from antennas, to surface wave guiding, to control of scattering. To increase their anisotropy requires elongated unit cells which have reduced symmetry and thus are not easily arranged into arbitrary patterns. We discuss the limitations of existing patterning techniques, and explore options for generating anisotropic impedance surfaces with arbitrary spatial variation. We present an approach that allows a wide range of anisotropic impedance profiles, based on a point-shifting method combined with a Voronoi cell generation technique. This approach can be used to produce patterns which include highly elongated cells with varying orientation, and cells which can smoothly transition between square, rectangular, hexagonal, and other shapes with a wide range of aspect ratios. We demonstrate a practical implementation of this technique which allows us to define gaps between the cells to generate impedance surfaces, and we use it to implement a simple example of a structure which requires smoothly varying impedance, in the form of a planar Luneberg lens. Simulations of the lens are verified by measurements, validating our pattern generation technique.

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Section: Beam Shifting Patterningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Patterning Technique for Generating Arbitrary Anisotropic Impedance Surfaces

Lee

Sievenpiper

2016

IEEE Trans. Antennas Propagat.

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“…On the other hand, moulding boundary conditions appears technologically simpler in a microwave regime and can be used for controlling SW propagation and shaping the relevant wavefronts, with the objective of constructing engineering devices [8,9]. Luneburg [10,11] and Maxwell fish-eye lenses [9], beam shifters [12,13] and beam splitters [13] have been recently presented. TO quasi-flat devices can be also constructed by using non-uniform thickness grounded dielectric [14,15].…”

Section: Introductionmentioning

confidence: 99%

Metasurface transformation for surface wave control

Martini

Mencagli

Maci

2015

Phil. Trans. R. Soc. A.

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Metasurfaces (MTSs) constitute a class of thin metamaterials used for controlling plane waves and surface waves (SWs). At microwave frequencies, they are constituted by a metallic texture with elements of sub-wavelength size printed on thin grounded dielectric substrates. These structures support the propagation of SWs. By averaging the tangential fields, the MTSs can be characterized through homogenized isotropic or anisotropic boundary conditions, which can be described through a homogeneous equivalent impedance. This impedance can be spatially modulated by locally changing the size/orientation of the texture elements. This allows for a deformation of the SW wavefront which addresses the local wavevector along not-rectilinear paths. The effect of the MTS modulation can be analysed in the framework of transformation optics. This article reviews theory and implementation of this MTS transformation and shows some examples at microwave frequencies.

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Improved Numerical Estimation Method for Surface Wave Attenuation on Metasurfaces

Suzuki,

Dang,

Homma

et al. 2024

Advcd Theory and Sims

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Comprehensive numerical tools to investigate and analyze the surface wave attenuation on a metasurface waveguide that consists of periodic patches deposited on a dielectric substrate are presented. The surface wave attenuation is evaluated in both waveguide and open‐space environments at high frequencies around the 28‐GHz band. Two approaches including a driven modal approach and an integrated eigenmode approach for investigating the attenuation behaviors in a metasurface waveguide operating in transverse electromagnetic (TEM) mode are employed. These results show different attenuation values depending on the waveguide height due to an unavoidable coupling issue despite the same metasurface design. Thus, an alternative method for more accurately evaluating the frequency‐dependent attenuation characteristics through field distribution in open space with a customized horn antenna is proposed. A relationship between the surface wave attenuation and the propagation distance by analyzing the analytical electric field distribution at different points on the propagation path in the open space is established. Thus, this study provides an improved method for assessing surface wave attenuation characteristics, which contributes to designing surface wave control for wireless communications, wireless power transfer, signal processing, and electromagnetic compatibility.

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Surface Wave Scattering Reduction Using Beam Shifters

Cited by 35 publications

References 13 publications

Patterning Technique for Generating Arbitrary Anisotropic Impedance Surfaces

Patterning Technique for Generating Arbitrary Anisotropic Impedance Surfaces

Metasurface transformation for surface wave control

Improved Numerical Estimation Method for Surface Wave Attenuation on Metasurfaces

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