Metasurface transformation for surface wave control

Martini, Enrica; Mencagli, Mario Junior; Maci, S.

doi:10.1098/rsta.2014.0355

Cited by 64 publications

(28 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5a) is introduced. This cell presents only one axe of symmetry, however in contrast with what is stated in [26] its equivalent tensor is a purely imaginary symmetric tensor. This property is a direct consequence of the absence of losses and of the reciprocity of the used media [23].…”

Section: Metasurface and Aperture Field Antenna Designmentioning

confidence: 88%

Implementation of Radiating Aperture Field Distribution Using Tensorial Metasurfaces

Teniou

Roussel

Capet

et al. 2017

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

Abstract-This paper deals with the design of tensorial modulated metasurfaces able to implement a general radiating aperture field distribution. A new aperture synthesis approach is introduced, based on local holography and variable impedance modulation. In particular, it is shown that tensorial metasurfaces can be used to generate general radiating distribution (phase and amplitude). In addition, a step by step algorithm is presented. In order to validate the method, several solutions are presented at 20 GHz which implement aperture distributions able to radiate different beams with general polarization.Index Terms-Metasurface antenna, leaky-waves, periodic surface, surface-waves. I. INTRODUCTIONn recent years, metamaterials have become an appealing subject of research. They are synthetic materials that have exotic properties that cannot be found in nature: double negative materials, negative index materials, left-handed materials… Metasurfaces are the equivalent of metamaterials in the case of 2D structures. The properties of these surfaces are described in terms of tensorial or scalar surface impedances (analogous to the constitutive parameters for volumetric metamaterials). Metasurfaces [9], orbital angular momentum communication [10] or transformation optics [11]-[12].All these works are based on the propagation properties of waves over a sinusoidally modulated impedance [13]. By choosing an appropriate modulated surface impedance, it is possible to control the propagation of SW along a surface or to obtain the transition from SW to leaky wave (LW) modes in order to realize antennas [16], [17].Surfaces composed of sub-wavelength printed elements over grounded dielectric slabs were largely used in order to obtain modulated scalar impedances by locally changing the dimensions of the elements [1]- [15]. Symmetric elements are used to produce scalar impedances [1] [19]. However, the direction of the radiating aperture field (or the equivalent surface current) is dictated by the source [19]. This latter aspect limits the number of possible aperture field distributions that can be implemented.Recently, tensorial metasurfaces were successfully used in antenna design that can radiate CP waves [1], [20] and isoflux shaped beam antennas for space applications [20], [21].The additional degrees of freedom offered by tensorial metasurfaces could be used to overcome the limits of scalar solution by generalizing the procedure presented in [19].Our objective is to propose a systematic procedure for the design of metasurface antennas capable of implementing a general aperture field distribution (amplitude, phase and direction). The principal novelty of this approach is the independent control of the generated aperture field components. This important aspect (critical for general aperture implementation), is achieved by introducing independent modulations of the impedance tensorial components and a new exact holographic formulation. Moreover, average impedance variation along the propagation direction is introduced in ord...

show abstract

Section: Metasurface and Aperture Field Antenna Designmentioning

confidence: 88%

Implementation of Radiating Aperture Field Distribution Using Tensorial Metasurfaces

Teniou

Roussel

Capet

et al. 2017

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

show abstract

“…On the other, twodimensional waves (such as waves propagating on a surface) can be controlled by metasurfaces to perform a variety of functions, including beam splitting, wavefront transformations and conversion between surface (two-dimensional) and space (three-dimensional) waves, described by Martini et al [19]. The design of metasurfaces to achieve such functionality is a similar challenge to designing three-dimensional metamaterials, in many respects, but the methodologies described in this issue demonstrate convincingly how this may be achieved at both radio and optical frequencies [19][20][21].…”

Section: Discussionmentioning

confidence: 99%

“…waves tangential to the metasurface). The development and analysis of metasurfaces are discussed first, with an emphasis on the use of an equivalent surface impedance for describing the metasurface [19]. A number of unit cells are described, together with ways of controlling the effective metasurface properties by modifying the unit cells.…”

Section: Currently Available (Including Optical)mentioning

confidence: 99%

Spatial transformations: from fundamentals to applications

Foster

Grant

Hao

et al. 2015

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

show abstract

“…Bounded slow surface waves (SWs) can be guided on these structures with engineered dispersion properties. This is the case for the near-field plates, planar lenses and cloaking structures found in the literature [4][5][6][7]. Based on the transverse resonance condition, such structures have been characterized by means of scalar or tensor surface impedances [1].…”

Section: Introductionmentioning

confidence: 99%

Dispersion Properties of an Elliptical Patch with Cross-Shaped Aperture for Synchronized Propagation of Transverse Magnetic and Electric Surface Waves

et al. 2018

View full text Add to dashboard Cite

This paper presents a novel pixel geometry for the implementation of metasurfaces requiring synchronized phase propagation of transverse magnetic (TM) and transverse electric (TE) modes. The pixel is composed by an elliptical metallic patch with an asymmetric cross-shaped aperture in the center, printed on a grounded slab. A practical implementation of a metasurface was carried out employing such a pixel geometry. Simulation results show similar frequency dispersion properties for both modes within the working frequency band, in agreement with the theoretical basis.

show abstract

Metasurface transformation for surface wave control

Cited by 64 publications

References 35 publications

Implementation of Radiating Aperture Field Distribution Using Tensorial Metasurfaces

Implementation of Radiating Aperture Field Distribution Using Tensorial Metasurfaces

Spatial transformations: from fundamentals to applications

Dispersion Properties of an Elliptical Patch with Cross-Shaped Aperture for Synchronized Propagation of Transverse Magnetic and Electric Surface Waves

Contact Info

Product

Resources

About