Novel Terahertz Antenna Based on a Silicon Lens Fed by a Leaky Wave Enhanced Waveguide

Llombart, Nuria; Chattopadhyay, Goutam; Skalare, A.; Mehdi, Imran

doi:10.1109/tap.2011.2143663

Cited by 121 publications

(98 citation statements)

References 15 publications

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“…3(c), where the maxima are at 54 GHz and 54.75 GHz. When comparing the reflectance of the zoned fishnet metamaterial lens with a zoned lens made of Silicon (dashed grey line), a material widely used for lenses at millimeter-waves and terahertz [23,24], it is evident that the lens introduced here outperforms the Silicon counterpart in terms of Fresnel reflection losses for ~54 -55. 5 GHz.…”

Section: Simulation Resultsmentioning

confidence: 99%

Exploiting the dispersion of the double-negative-index fishnet metamaterial to create a broadband low-profile metallic lens

Orazbayev¹,

Pacheco‐Peña²,

Beruete³

et al. 2015

Opt. Express

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Metamaterial lenses with close values of permittivity and permeability usually display low reflection losses at the expense of narrow single frequency operation. Here, a broadband low-profile lens is designed by exploiting the dispersion of a fishnet metamaterial together with the zoning technique. The lens operates in a broadband regime from 54 GHz to 58 GHz, representing a fractional bandwidth ∼7%, and outperforms Silicon lenses between 54 and 55.5 GHz. This broadband operation is demonstrated by a systematic analysis comprising Huygens-Fresnel analytical method, full-wave numerical simulations and experimental measurements at millimeter waves. For demonstrative purposes, a detailed study of the lens operation at two frequencies is done for the most important lens parameters (focal length, depth of focus, resolution, radiation diagram). Experimental results demonstrate diffraction-limited ~0.5λ transverse resolution, in agreement with analytical and numerical calculations. In a lens antenna configuration, a directivity as high as 16.6 dBi is achieved. The different focal lengths implemented into a single lens could be potentially used for realizing the front end of a non-mechanical zoom millimeter-wave imaging system.

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Section: Simulation Resultsmentioning

confidence: 99%

Exploiting the dispersion of the double-negative-index fishnet metamaterial to create a broadband low-profile metallic lens

Orazbayev¹,

Pacheco‐Peña²,

Beruete³

et al. 2015

Opt. Express

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show abstract

“…137 A 2D implementation for fast-wave LWAs exists in the form of Fabry-Pérot cavity resonator antennas. 160 In this case, the LWA was defined by a planar gap between a ground plane and the base of a hemispherical lens made of silicon and was fed by a slot-terminated rectangular waveguide attached to the ground plane. This leaky-wave structure on its own did not perform beamforming directly but was used as a directive primary feed for the lens.…”

Section: B Fast-wave Implementationsmentioning

confidence: 99%

Tutorial: Terahertz beamforming, from concepts to realizations

et al. 2018

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The terahertz range possesses significant untapped potential for applications including high-volume wireless communications, noninvasive medical imaging, sensing, and safe security screening. However, due to the unique characteristics and constraints of terahertz waves, the vast majority of these applications are entirely dependent upon the availability of beam control techniques. Thus, the development of advanced terahertz-range beam control techniques yields a range of useful and unparalleled applications. This article provides an overview and tutorial on terahertz beam control. The underlying principles of wavefront engineering include array antenna theory and diffraction optics, which are drawn from the neighboring microwave and optical regimes, respectively. As both principles are applicable across the electromagnetic spectrum, they are reconciled in this overview. This provides a useful foundation for investigations into beam control in the terahertz range, which lies between microwaves and infrared light. Thereafter, noteworthy experimental demonstrations of beam control in the terahertz range are discussed, and these include geometric optics, phased array devices, leaky-wave antennas, reflectarrays, and transmitarrays. These techniques are compared and contrasted for their suitability in applications of terahertz waves.

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“…The approximate reflection coefficient |Γ| = 0.3 is obtained using the expression with A max and A min as the maximum and minimum values of the field amplitude [21]. The impedance matching is quite good compared with typical dielectric lenses at terahertz frequencies [27,28], generally made of silicon whose relative permittivity (ε r ) is 11.9, leading to a reflection coefficient of 0.55. It is also possible to find commercial dielectric lenses for terahertz applications [29,30] made of Teflon (ε r = 1.9) or Tsurupica (ε r = 2.31) whose reflection coefficient would be lower than 0.3, assuming lossless dielectrics.…”

Section: Two-dimensional Lensmentioning

confidence: 99%

Terahertz epsilon-near-zero graded-index lens

Torres¹,

Pacheco‐Peña²,

Rodríguez-Ulibarri³

et al. 2013

Opt. Express

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An epsilon-near-zero graded-index converging lens with planar faces is proposed and analyzed. Each perfectly-electric conducting (PEC) waveguide comprising the lens operates slightly above its cut-off frequency and has the same length but different cross-sectional dimensions. This allows controlling individually the propagation constant and the normalized characteristic impedance of each waveguide for the desired phase front at the lens output while Fresnel reflection losses are minimized. A complete theoretical analysis based on the waveguide theory and Fermat's principle is provided. This is complemented with numerical simulation results of two-dimensional and three-dimensional lenses, made of PEC and aluminum, respectively, and working in the terahertz regime, which show good agreement with the analytical work.

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Novel Terahertz Antenna Based on a Silicon Lens Fed by a Leaky Wave Enhanced Waveguide

Cited by 121 publications

References 15 publications

Exploiting the dispersion of the double-negative-index fishnet metamaterial to create a broadband low-profile metallic lens

Exploiting the dispersion of the double-negative-index fishnet metamaterial to create a broadband low-profile metallic lens

Tutorial: Terahertz beamforming, from concepts to realizations

Terahertz epsilon-near-zero graded-index lens

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