Spiral Leaky-Wave Antennas Based on Modulated Surface Impedance

Minatti, G.; Caminita, F.; Casaletti, Massimiliano; Maci, S.

doi:10.1109/tap.2011.2165691

Cited by 262 publications

(137 citation statements)

References 15 publications

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“…We finally note that the form of (6), whose coefficients in the TM/TE bases are functions of k ρ = |k t | only, exactly reflects the assumed rotational invariance of the homogenized metasurface. Furthermore, the non-local nature of the surface impedance dyadic is fully taken into account by its dependence with k ρ , in contrast to different approaches where the spatial dispersion is considered approximately by evaluating the impedance at a specific average wavenumber [34]. Let us now consider an omnidirectional (i.e., φ-independent) cylindrical wave with radial wavenumber k ρ propagating along the considered structure.…”

Section: Omnidirectional Homogenized Equivalent-network Modelmentioning

confidence: 99%

“…Typical examples are Fabry-Pérot cavity antennas in which a simple source excites a parallel-plate waveguide whose upper plate is a partially-reflecting surface (PRS) [28][29][30][31]. The PRS may be a uniform dielectric medium or a periodic screen, e.g., a printed metasurface, which can be represented, in the low-frequency regime, as an equivalent uniform homogenized surface [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Omnidirectional Radiation in the Presence of Homogenized Metasurfaces

Ruscio¹,

Burghignoli²,

Baccarelli³

et al. 2015

PIER

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Abstract-Analytical and numerical approaches are presented for modeling the interaction of azimuthally symmetric fields with omnidirectional metasurfaces, based on the use of locally homogenized equivalent sheet impedances. Radially uniform metasurfaces on layered dielectric media are described in terms of a spectral impedance dyadic, thus allowing for the derivation of the field excited by omnidirectional sources through a simple transmission-line model. In a first approximation, the effect of circular edges in laterally truncated structures is taken into account through an efficient physicaloptics method. Then, truncated and radially non-uniform homogenized layered structures are treated numerically with the method of moments, by suitably extending a recently developed spectral-domain formulation. Numerical results are presented for planar radiating structures based on omnidirectional metasurfaces, comparing the radiation patterns obtained through the proposed homogenized models with those calculated by means of full-wave simulations. The discussion emphasizes the validity of the proposed approaches and their usefulness in the analysis of two-dimensional leaky-wave antennas based on printed omnidirectional metasurfaces.

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Section: Omnidirectional Homogenized Equivalent-network Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Omnidirectional Radiation in the Presence of Homogenized Metasurfaces

Ruscio¹,

Burghignoli²,

Baccarelli³

et al. 2015

PIER

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“…Since the elements are subwavelength in dimension, they can be used to approximate continuous hologram solutions, such as that considered early on by Oliner and Hessel [18]. The surface-wave metasurface antenna has proven to be an attractive platform for electrically large and conformal apertures [19], with many antenna variations now demonstrated [20][21][22][23][24][25]. The concept of slot arrays has also gained traction as a means of enabling beam synthesis for different applications [26,27].…”

Section: Introductionmentioning

confidence: 99%

“…The surface impedance is a continuous function in [18], so that there is no reduction to implementation in this work. That reduction to realizable structures occurred later [17,19,20] in the context of launching a surface mode that would then radiate as a collimated beam. This is an inherently different type of analysis and structure, and one that depending on a discrete surface impedance that would closely approximate a smooth, continuous function.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Waveguide-Fed Metasurface Antenna

et al. 2017

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The metasurface concept has emerged as an advantageous reconfigurable antenna architecture for beam forming and wavefront shaping, with applications that include satellite and terrestrial communications, radar, imaging, and wireless power transfer. The metasurface antenna consists of an array of metamaterial elements distributed over an electrically large structure, each subwavelength in dimension and with subwavelength separation between elements. In the antenna configuration we consider here, the metasurface is excited by the fields from an attached waveguide. Each metamaterial element can be modeled as a polarizable dipole that couples the waveguide mode to radiation modes. Distinct from the phased array and electronically scanned antenna (ESA) architectures, a dynamic metasurface antenna does not require active phase shifters and amplifiers, but rather achieves reconfigurability by shifting the resonance frequency of each individual metamaterial element. Here we derive the basic properties of a one-dimensional waveguide-fed metasurface antenna in the approximation that the metamaterial elements do not perturb the waveguide mode and are non-interacting. We derive analytical approximations for the array factors of the 1D antenna, including the effective polarizabilities needed for amplitude-only, phase-only, and binary constraints. Using full-wave numerical simulations, we confirm the analysis, modeling waveguides with slots or complementary metamaterial elements patterned into one of the surfaces.

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“…MTSs have also been successfully used to design and manufacture high-gain holographic antennas [6,7]. In [8], multi-layered MTSs with sub-wavelength profile were used as partial reflective surfaces to design a high-gain antenna with an enhanced bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Dipole‐slot‐dipole metasurfaces

Bukhari

Whittow

Vardaxoglou

et al. 2016

IET Microwaves, Antennas & Propagation

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A complementary frequency selective surface (CFSS) can be formed on the basis of Babinet's principle. It consists of an array of slots separated from an array of dipoles by a thin dielectric substrate. This study shows that by adding an extra layer of dipoles to a CFSS capacitance can be added to the structure, which leads to a decrease in its resonant frequency. This new structure is called a dipole-slot-dipole metasurface (MTS) and it has unit-cell dimensions of l/10 × l/10 × l/333, where l is representing the free space wavelength. The dipole-slot-dipole MTS has been fabricated and measured. The study also reports on its equivalent circuit; and the effects of the length of the dipoles on the added layer and their alignment on the pass band resonant frequency of the dipole-slot-dipole MTS.

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Spiral Leaky-Wave Antennas Based on Modulated Surface Impedance

Cited by 262 publications

References 15 publications

Omnidirectional Radiation in the Presence of Homogenized Metasurfaces

Omnidirectional Radiation in the Presence of Homogenized Metasurfaces

Analysis of a Waveguide-Fed Metasurface Antenna

Dipole‐slot‐dipole metasurfaces

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