Design and characterization of a tunable DNG metamaterial superstrate for small beam steering antennas

Griguer, Hafid; Drissi, M'Hamed; Marzolf, Eric; Lalj, Hicham; Riouch, Fatima

doi:10.1007/s00339-011-6252-0

Cited by 11 publications

(8 citation statements)

References 4 publications

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“…However, in the proposed configuration, the superstrate is placed at approximately one‐tenth of the free space wavelength above the antenna and does not require resonant thickness. We note that the beam steering that was demonstrated earlier in the contemporary superstrate‐covered antennas takes place due to the secondary radiation by the metallic unit cells forming the superstrate layer [4]. The configuration proposed here, however, utilizes the dual‐aperture radiation mechanism of the microstrip antenna, and the superstrate acts only as a way to introduce a phase difference.…”

Section: Introductionmentioning

confidence: 96%

Beam tilting of single microstrip antenna using high permittivity superstrate

Attia

Siddiqui

Ramahi

2013

Micro & Optical Tech Letters

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Antenna beam tilting or steering requires multiple antenna elements to be phase shifted and arranged in the form of an array. This article presents a novel method to tilt the main beam of a microstrip patch by partially covering it with a high dielectric‐constant superstrate. The beam tilting is possible because of the dual‐slot radiation mechanism of the microstrip antenna. In effect, the electromagnetic radiation from the covered radiating slot reaches the far‐field with an additional phase with respect to the uncovered slot, resulting in an inclined beam whose angle depends on the superstrate's refractive index. Experimentally and numerically, a beam deflection of 25° is achieved when a microstrip patch is partially covered with a superstrate having a dielectric constant of 10. Moreover, the proposed structure provides gain enhancement of about 3 dB. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1657–1661, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27659

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Section: Introductionmentioning

confidence: 96%

Beam tilting of single microstrip antenna using high permittivity superstrate

Attia

Siddiqui

Ramahi

2013

Micro & Optical Tech Letters

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“…Material properties can be regulated using methods such as mechanical deformation and electrical control (e.g., varactors, switches), which tend to be the preferred approach [ 16 ]. Besides being low cost, varactor diodes are popular instead of expensive phase-shifting devices in beam steering applications [ 17 ]. These electrically driven components (e.g., varactors) can be regulated using external voltages or currents.…”

Section: Introductionmentioning

confidence: 99%

“…The varactor is substituted with an equivalent capacitance, thus, a full DC biasing circuit to practically tune the MTM is not available. Another work with a similar lack of DC biasing information is presented in [ 17 ], where a varactor diode was also used to tune the refractive index of the MTM unit cells. Despite this, practical DC biasing circuits were not fully implemented in both previous works.…”

Section: Introductionmentioning

confidence: 99%

Electrically Tunable Left-Handed Textile Metamaterial for Microwave Applications

et al. 2021

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An electrically tunable, textile-based metamaterial (MTM) is presented in this work. The proposed MTM unit cell consists of a decagonal-shaped split-ring resonator and a slotted ground plane integrated with RF varactor diodes. The characteristics of the proposed MTM were first studied independently using a single unit cell, prior to different array combinations consisting of 1 × 2, 2 × 1, and 2 × 2 unit cells. Experimental validation was conducted for the fabricated 2 × 2 unit cell array format. The proposed tunable MTM array exhibits tunable left-handed characteristics for both simulation and measurement from 2.71 to 5.51 GHz and provides a tunable transmission coefficient of the MTM. Besides the left-handed properties within the frequency of interest (from 1 to 15 GHz), the proposed MTM also exhibits negative permittivity and permeability from 8.54 to 10.82 GHz and from 10.6 to 13.78 GHz, respectively. The proposed tunable MTM could operate in a dynamic mode using a feedback system for different microwave wearable applications.

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“…For this operation the thickness of the superstrate should be half of the wavelength [17]. The multi-layer antenna structure is analyzed using the transverse equivalent model [18], when the source is a Hertzian dipole. The transverse equivalent network model was modified to arbitrarily orient multi-layer dielectric structure, with respect to the arbitrary feeding source.…”

Section: Introductionmentioning

confidence: 99%

Beam Diversity Analysis of Compact Microstrip Antenna with Suspended Superstrate: An Experimental Study

Barad

Behera

2017

AEM

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A multi-functional microstrip compact antenna capable of steering the main beam to eight different directions in the elevation plane is conferred in this study. The compact antenna consists of a driven patch of to bring in the resonance to , for achieving enormous application in european radar service under Wi-MAX band. The conductive layer on the superstrate deflect the beam with an angle corresponding to the position of superstrate on parasitic layer, without considering complex phase shifters and associated circuits. Proper alignment of superstrate results maximum scanning angle of with of deflection angle. The directivity of the antenna is enhanced by manipulating the parameters of the superstrate. The gain of the antenna was improved up to and the efficiency is improved up to using engineered superstrate. The full-wave simulation as well as analytical study was done using the IE3D EM simulator.

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Design and characterization of a tunable DNG metamaterial superstrate for small beam steering antennas

Cited by 11 publications

References 4 publications

Beam tilting of single microstrip antenna using high permittivity superstrate

Beam tilting of single microstrip antenna using high permittivity superstrate

Electrically Tunable Left-Handed Textile Metamaterial for Microwave Applications

Beam Diversity Analysis of Compact Microstrip Antenna with Suspended Superstrate: An Experimental Study

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