Non-Uniform Metasurface Luneburg Lens Antenna Design

Bosiljevac, Marko; Casaletti, Massimiliano; Caminita, F.; Šipuš, Zvonimir; Maci, S.

doi:10.1109/tap.2012.2207047

Cited by 204 publications

(93 citation statements)

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“…However, there is no corresponding study on the effects of finite sample size on the propagation of surface waves themselves. At microwave frequencies, these surface modes have been explored particularly using metasurfaces [19], subwavelengthstructured metallic surfaces that yield novel properties such as negative refraction [20], band gaps [21], and dispersive behavior leading to the design of surface wave lenses and antennas [22][23][24][25]. With the development of miniaturization * mc586@exeter.ac.uk techniques, some of these applications have also been extended to optical frequencies [26,27].…”

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Theoretical and experimental exploration of finite sample size effects on the propagation of surface waves supported by slot arrays

et al. 2017

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The propagation of surface waves supported by a finite array of slots perforated on a zero thickness perfect electrically conducting screen is studied both experimentally and theoretically. To generate numerical results, the integral equation satisfied by the electric field in the slots is efficiently solved by means of Galerkin's method, treating the metal as perfectly conducting. The finite size of the array along the direction of propagation creates a family of states of higher momentum and lower amplitude than the single mode for the corresponding infinite array. These modes are spaced in momentum with a periodicity inversely proportional to the length of the array. In addition, the finite width in the transverse direction produces a set of higher frequency modes due to this additional quantization. Both effects arising from finite sample length and width are explained by the theoretical model and validated experimentally. DOI: 10.1103/PhysRevB.95.245425 The existence of strongly localized surface modes supported by corrugated metallic surfaces at frequencies varying from terahertz [1] to microwaves [2] is well established. At optical frequencies, due to the Drude-like properties of the metal, these exist even on flat surfaces, being labeled surface plasmons polaritons (SPPs) [3,4]. However, following the discovery of extraordinary optical transmission (EOT) [5] and the later theoretical calculations, these surface waves were linked to a massively enhanced transmission through subwavelength holes [6,7] due to the diffractive coupling of radiative modes with the SPPs. This theory was, however, essentially developed for optical frequencies relying on the presence of SPPs. The subsequent discovery of EOT at frequencies at which metals behave as near perfect electric conductors (PEC), such as microwaves [8,9], launched the search for a more general theory. Many workers in the field made analogies of the surface waves supported on a patterned PEC with the aforementioned SPP, and due to the similarities with the SPP dispersion, the modes became commonly known as the "spoof surface plasmons" [10][11][12]. It should be noted, however, that there has been a wealth of studies of surface waves on metals at low frequencies, dating back to the 1940s [13,14]. This connection between the surface waves supported by hole arrays and the transmission through them has given rise to much research [15,16] in which the transmission through both infinite and finite arrays of holes and slits has been studied often using a modal matching approach [17,18]. However, there is no corresponding study on the effects of finite sample size on the propagation of surface waves themselves. At microwave frequencies, these surface modes have been explored particularly using metasurfaces [19], subwavelengthstructured metallic surfaces that yield novel properties such as negative refraction [20], band gaps [21], and dispersive behavior leading to the design of surface wave lenses and antennas [22][23][24][25]. With the development of miniaturiza...

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Theoretical and experimental exploration of finite sample size effects on the propagation of surface waves supported by slot arrays

et al. 2017

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“…A Luneburg lens is a non-uniform lens that transforms a spherical wave into a plane wave (and vice versa) [46,47].…”

Section: B Two Spatially Distinct Luneburg Lens Antennasmentioning

confidence: 99%

A hybrid Boundary Element Unstructured Transmission-line (BEUT) method for accurate 2D electromagnetic simulation

Simmons

Cools

Sewell

2016

Journal of Computational Physics

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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].…”

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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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Non-Uniform Metasurface Luneburg Lens Antenna Design

Cited by 204 publications

References 14 publications

Theoretical and experimental exploration of finite sample size effects on the propagation of surface waves supported by slot arrays

Theoretical and experimental exploration of finite sample size effects on the propagation of surface waves supported by slot arrays

A hybrid Boundary Element Unstructured Transmission-line (BEUT) method for accurate 2D electromagnetic simulation

Metasurface transformation for surface wave control

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