Analytically Expressed Dispersion Diagram of Unit Cells for a Novel Type of Holographic Surface

Matekovits, Ladislau

doi:10.1109/lawp.2011.2105854

Cited by 32 publications

(9 citation statements)

References 8 publications

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“…The unit cell of dimension D u =D v =4 mm contains a modulated microstrip line whose width varies between w min =0.2 and w max =3.8 mm. The variation has been chosen in such a way, that for the flat case it guarantees a sinusoidal variation of the effective dielectric constant [6].…”

Section: Resultsmentioning

confidence: 99%

Experimental 2D characterization of the electromagnetic field distribution scattered by an EBG cylinder

Matekovits

Dassano

Orefice

2012

Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation

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Experimental characterization of the electromagnetic field behind a cylindrical obstacle covered with an Electromagnetic Band-Gap (EBG) structure consisting of a width-modulated microstrip line on a flexible dielectric substrate is described. Such a characterization is carried out by a semiautomatic set-up, which allows a 2D scanning over an area of several wavelengths in the Ku band. The effect of the novel type of cloaking configuration is characterized, by comparing the field distribution behind the object with respect to the uncloaked configuration.

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Section: Resultsmentioning

confidence: 99%

Experimental 2D characterization of the electromagnetic field distribution scattered by an EBG cylinder

Matekovits

Dassano

Orefice

2012

Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation

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“…In the Cartesian coordinate system all unit cells have the same rectangular shape with edges of length of D u = 4.5 mm, D v = 4 mm. The shape of the metallic conductors has been designed according to the procedure described in [6], [8], where the effective dielectric constant within the unit cell varies according to the expression:…”

Section: A the Geometrymentioning

confidence: 99%

Anisotropic cloaking of a metallic cylinder

Matekovits

Ranga

Bird

et al. 2014

2014 International Workshop on Antenna Technology: Small Antennas, Novel EM Structures and Materials, and Applications (iWAT)

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Electromagnetic footprint reduction for a metallic cylinder wrapped in a printed meta-surface is discussed. The meta-surface consists of a quasi-periodic pattern arrangement printed on a homogeneous dielectric layer of constant thickness, which is conformal to the cylinder, giving rise to an anisotropic cloak. Numerical analysis of the radar cross section (RCS) and field topography around the cloaked cylinder for different polarizations of the incident plane wave are considered, and it is demonstrated that the proposed solution reduces the RCS of the cylinder differently for variable incidence.

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“…For antenna applications, metasurfaces are used to convert an incident surface wave (SW), launched by a feeder, into a leaky wave (LW) mode, using a locally-periodic modulation [1]- [3], [14]- [21].…”

Section: Introductionmentioning

confidence: 99%

Implementation of Radiating Aperture Field Distribution Using Tensorial Metasurfaces

Teniou

Roussel

Capet

et al. 2017

IEEE Trans. Antennas Propagat.

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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...

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Analytically Expressed Dispersion Diagram of Unit Cells for a Novel Type of Holographic Surface

Cited by 32 publications

References 8 publications

Experimental 2D characterization of the electromagnetic field distribution scattered by an EBG cylinder

Experimental 2D characterization of the electromagnetic field distribution scattered by an EBG cylinder

Anisotropic cloaking of a metallic cylinder

Implementation of Radiating Aperture Field Distribution Using Tensorial Metasurfaces

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