On the performance of the 2D planar metamaterial structure

Elwi, Taha A.; Hamed, Marwa Maki; Abbas, Zulkifly; Elwi, Mohammed

doi:10.1016/j.aeue.2014.03.013

Cited by 27 publications

(28 citation statements)

References 6 publications

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“…The main objective of the cloaking is to reconstruct the phase front of the incident electromagnetic waves after passing the object to be cloaked . To achieve that, the incident wave has to spend an equal time inside the cloak as it takes to pass an object in the free space . Consequently, if the reflective index of the proposed unit cell is less than unity, the phase velocity would be greater than the speed of light in the free space.…”

Section: Rbf Performance and Discussionmentioning

confidence: 99%

“…24 To achieve that, the incident wave has to spend an equal time inside the cloak as it takes to pass an object in the free space. 25 Consequently, if the reflective index of the proposed unit cell is less than unity, the phase velocity would be greater than the speed of light in the free space. It is found that the proposed RBF based on a single unit cell shows a zero refractive index at 4 GHz.…”

Section: Rbf Performance and Discussionmentioning

confidence: 99%

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On the design of a reject band filter for antennas mutual coupling reduction

Ahmed

Elwi

2019

Int J RF Microw Comput Aided Eng

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In this article, a novel concept for mutual coupling reduction between antenna elements is proposed at 2.45 GHz for Wi‐Fi applications. A reject band filter (RBF) is used in order to reduce the mutual coupling between two monopoles for multi‐input multi‐output (MIMO) systems. The proposed RBF inclusions are developed to have zero refractive index response over a specific frequency band. The inclusions considered here are composed of open‐loop resonators; each one with the same iteration level of Minkowski‐like pre‐fractal structures coupled with an open‐stub transmission line to increase the band selectivity. The inclusions are inserted between λ/2‐spaced monopole elements at 2.45 GHz. A significant mutual coupling reduction is realized by incorporating only two RBF cells. Such effective response is attributed to the electromagnetic wave cloaking at 2.45 GHz using the developed RBF inclusions. An extensive theoretical study using both numerical and analytical methods is invoked to obtain the best performance of the proposed MIMO antenna structure. Finally, the experimental and numerical results are agreed excellently.

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Section: Rbf Performance and Discussionmentioning

confidence: 99%

Section: Rbf Performance and Discussionmentioning

confidence: 99%

On the design of a reject band filter for antennas mutual coupling reduction

Ahmed

Elwi

2019

Int J RF Microw Comput Aided Eng

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“…The proposed EBG structures exhibit a capacitive behavior [22], so work as a high-pass filter that allows passing the high frequencies and prevent lower bands. On the other hand, each unit cell can be considered unbalanced circuit because of the inductive absence where the influence of capacitive reactance on the EBG width is higher than its length for the surface current.…”

Section: Ebg Analysis and Performance Studymentioning

confidence: 99%

A Miniaturized Lotus Shaped Microstrip Antenna Loaded With Ebg Structures for High Gain-Bandwidth Product Applications

Elwi¹,

Imran²,

Alnaiemy³

2015

PIER C

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Abstract-In this paper, the design of a printed circuit antenna based on lotus flower patch of a miniaturized profile is proposed. The antenna consists of three layers including a patch and a ground plane of a thin copper layer separated by a Roger RT/duroid R 5880 substrate for high gain-bandwidth product applications including microwave imaging systems. The patch structure is patterned with triangular defects to provide a fractal structure. Nevertheless, the ground plane is defected with Electromagnetic Band Gap (EBG) structures. The antenna is found to show a first resonant mode around 3 GHz, while the other frequency modes are obtained around 4.2 GHz and 6 GHz which are below −10 dB. Moreover, the antenna operates over the frequency range from 7.8 GHz up to 15 GHz with a bore-sight gain varing from 4 dBi up to 6 dBi when operates in free-space environments. The antenna size is reduced to a 32 mm × 28 mm × 0.5 mm using shorting plates on the substrate edges. The antenna performance characteristics are examined using CST and HFSS commercial software packages, which are based on the Finite Integration Technique (FIT) and the Finite Element Method (FEM), respectively. Finally, the antenna performance is tested experimentally for both S 11 spectrum and radiation patterns to show an excellent matching with the obtained numerical results.

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“…While, metamaterials (MTMs) possess several attractive features such as surface wave reduction and unique stopbands . However, resonant MTM structures suffer from two fundamental limitations: narrow bandwidth over which the desired properties occur and losses due to the conducting inclusions . Miniaturized antennas made from fractal‐shaped space filling MTM curves were proposed in Elwi with enhanced bandwidths.…”

Section: Introductionmentioning

confidence: 99%

Novel miniaturized folded UWB microstrip antenna‐based metamaterial for RF energy harvesting

Elwi

Jassim

Mohammed

2020

Int J Communication

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Summary This paper presents a design of an ultra‐wideband (UWB) cylindrical metamaterial (MTM) antenna for radio frequency (RF) energy harvesting to suit the fields of Internet of Things (IoT) applications. The patch circuitry is based on 3×5 Hilbert‐shaped MTM unit cells array to enhance the antenna bandwidth. While, the antenna ground plane is defected with an electromagnetic band gap structure to enhance the gain. The antenna is mounted on a polytetrafluoroethylene cylindrical substrate of an outer diameter of 15 mm and length of 32 mm with 1 mm in thickness. The substrate relative permittivity is 2.04, and the loss tangent is 0.0002. The antenna patch and the ground plane structures are printed with silver nanoparticles ink using a 2.5D CNC plotter machine. The fabricated prototype provides an UWB over the frequency range from 3.77 up to 13.89 GHz with a first separate resonant mode at 3 GHz. The antenna performance is tested numerically using two different software packages of CST MWS and HFSS. Then, an experimental validation is conducted to realize the performance of the proposed antenna in harvesting the RF energy. Excellent conversion efficiency, about 90%, is achieved at 5.8 GHz. Finally, the antenna radiation patterns and S11 spectrum are measured and compared against their simulated results to achieve good agreements.

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On the performance of the 2D planar metamaterial structure

Cited by 27 publications

References 6 publications

On the design of a reject band filter for antennas mutual coupling reduction

On the design of a reject band filter for antennas mutual coupling reduction

A Miniaturized Lotus Shaped Microstrip Antenna Loaded With Ebg Structures for High Gain-Bandwidth Product Applications

Novel miniaturized folded UWB microstrip antenna‐based metamaterial for RF energy harvesting

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