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Special Issue "Antennas and Wireless Propagation Implementing Metamaterial Structures"

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A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Applied Physics".

Deadline for manuscript submissions: closed (15 January 2022) | Viewed by 12224

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Special Issue Editors

Dr. Shah Nawaz Burokur

E-Mail Website1 Website2
Guest Editor

LEME, UPL, Université Paris Nanterre, F92410 Ville d’Avray, France
Interests: metamaterials; metasurfaces; transformation optics; antennas; lenses; orbital angular momentum; holographic imaging; 3D printing; materials characterization
Special Issues, Collections and Topics in MDPI journals

Prof. Kuang Zhang

E-Mail Website
Guest Editor

Microwave Engineering, Harbin Institute of Technology, Harbin 150001, China
Interests: metamaterials; metasurfaces; antennas; microwave.

Special Issue Information

Dear Colleagues,

While antennas and electromagnetic waves have been applied in modern wireless communications, the development of novel techniques for the manipulation of electromagnetic beams through the reconsideration of the fundamental physics is becoming increasingly interesting. Metasurfaces, the two-dimensional subwavelength artificial electromagnetic structures, offer new opportunities for controlling amplitudes, phases, and polarizations of electromagnetic waves at the interface. Such a concept has shown the prospect of generating and manipulating electromagnetic beams of various forms within a deeply subwavelength scale, which is especially useful in novel antennas designs and compact RF devices or systems.

In this Special Issue, we invite researchers to contribute original and cutting-edge research works that will stimulate continuing efforts to understand electromagnetic metasurfaces and explore their applications in various aspects, particularly in the field of wireless propagation

Potential topics include, but are not limited to the following:

(1) Theory, modeling, and fabrication techniques of metasurface-based antennas

(2) Wavefront manipulation with active/passive metasurfaces

(3) Tunable and/or programmable metasurfaces for antennas

(4) Meta-lenses and meta-mirrors

(5) Metasurfaces for wireless communication systems

Prof. Shah Nawaz Burokur
Prof. Kuang Zhang
Guest Editors

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Keywords

metamaterials
metasurfaces
antennas
wireless communication

Published Papers (6 papers)

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Research

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Open AccessArticle

Designed Circularly Polarized Two-Port Microstrip MIMO Antenna for WLAN Applications

and

Appl. Sci. 2022, 12(3), 1068; https://doi.org/10.3390/app12031068 - 20 Jan 2022

Cited by 11 | Viewed by 1734

Abstract

The proposed work describes a corner square-cut square-patch multiple-input multiple-output (MIMO) antenna with reduced mutual coupling for circular polarization (CP). A two-port MIMO-CP antenna was designed and operated at 5.6 GHz for wireless local area network (WLAN) applications. The dimensions of the MIMO-CP [...] Read more.

22.5 \times 50 {mm}^{2}

(0.43 λ_{0} \times 0.933 λ_{0})

and the FR4 substrate height was 1.6 mm. Between the two-elements, the edge-to-edge distance was 12.2 mm (0.227

λ_{0}

), where

λ_{0}

was the free space wavelength at 5.6 GHz. A slot was created in the middle of the ground in the proposed MIMO antenna to reduce mutual coupling and improve CP. The ground slot improves impedance matching and provides a better S-parameter and axial ratio (AR), according to the antenna results. According to the simulated results, the proposed antenna bandwidth of 5.23–6.42 GHz (21.4%) for S11 were <

- 10

dB, isolation was −37 dB with a peak gain of 6 dB and AR

\leq 3

dB from 5.37 to 5.72 GHz (6.25%). The proposed antennas are simple to fabricate, have low profiles, are inexpensive, have good isolation, and are CP. The diversity gain (DG) and envelop correlation coefficient (ECC) results are better in the simulated frequency band. A MIMO-CP antenna geometry prototype is built and measured for comparison, yielding good results when compared to the simulated and measured results. The MIMO-CP antenna, as designed, is suitable for WLAN applications. Full article

(This article belongs to the Special Issue Antennas and Wireless Propagation Implementing Metamaterial Structures)

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Open AccessArticle

A Compact Wideband Active Two-Dipole HF Phased Array

Antonios Constantinides

and

Haris Haralambous

Appl. Sci. 2021, 11(19), 8952; https://doi.org/10.3390/app11198952 - 26 Sep 2021

Cited by 3 | Viewed by 1212

Abstract

The design and construction of an upgraded HF quarter-wavelength two-dipole active array with 90° difference feed was implemented in the course of a research project to perform a directional (azimuthal) investigation of interference at HF. The lack of affordable compact antennas to meet the project requirements was the incentive to develop a compact unidirectional antenna, with the maximum possible front-to-back ratio at frequencies of 20–30 MHz, where the dimensions of traditional passive antennas are enormous. By installing a low-noise very-high-input impedance amplifier in each dipole of the array, the effect of the mutual coupling between the two dipoles was reduced, improving the front-to-back (F/B) ratio over a wide frequency range. Electronic steering, easy polarization adjustment, and fast and easy deployment were the key requirements for the construction of the antenna. Therefore, a light and compact design was of the utmost importance to meet the space limitations at the monitoring site, which did not allow the deployment of a traditional HF directional antenna that employs a very long boom and elements. Full article

(This article belongs to the Special Issue Antennas and Wireless Propagation Implementing Metamaterial Structures)

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Figure 1

Open AccessFeature PaperArticle

Three-Dimensional Broadband and Isotropic Double-Mesh Twin-Wire Media for Meta-Lenses

and

Appl. Sci. 2021, 11(15), 7153; https://doi.org/10.3390/app11157153 - 03 Aug 2021

Cited by 5 | Viewed by 1564

Abstract

Lenses are used for multiple applications, including communications, surveillance and security, and medical instruments. In homogeneous lenses, the contour is used to control the electromagnetic propagation. Differently, graded-index lenses make use of inhomogeneous materials, which is an extra degree of freedom. This extra degree of freedom enables the design of devices with a high performance. For instance, rotationally symmetric lenses without spherical aberrations, e.g., the Luneburg lens, can be designed. However, the manufacturing of such lenses is more complex. One possible approach to implement these lenses is using metamaterials, which are able to produce equivalent refractive indices. Here, we propose a new type of three-dimensional metamaterial formed with two independent sets of wires. The double-mesh twin-wire structure permits the propagation of a first mode without cut-off frequency and with low dispersion and high isotropy. These properties are similar to periodic structures with higher symmetries, such as glide symmetry. The variations of the equivalent refractive index are achieved with the dimension of the meandered wires. The potential of this new metamaterial is demonstrated with simulated results of a Luneburg meta-lens. Full article

(This article belongs to the Special Issue Antennas and Wireless Propagation Implementing Metamaterial Structures)

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Figure 1

Open AccessArticle

A Phased Array Antenna with New Elements Designed Using Source Transformations

and

Appl. Sci. 2021, 11(7), 3162; https://doi.org/10.3390/app11073162 - 01 Apr 2021

Cited by 1 | Viewed by 1554

Abstract

Transformation electromagnetics/optics (TE/TO) has been shown to be a useful technique in designing electromagnetic devices with very unique properties. Here, the concepts of transformation optics for single elements is extended to an array of “pinwheel” shaped elements for the first time. Through full-wave finite element analysis (FEA), it is shown that a transformed “pinwheel” linear array can be designed to operate identically to a uniformly spaced linear dipole array. Thus, the “pinwheel” antenna array will maintain all the advantages of array processing of a simple dipole antenna array. The proposed method has applications in structurally integrated and conformal phased arrays for wireless communications, radars, and sensing where structural and mechanical constrains do not align with antenna performance. Full article

(This article belongs to the Special Issue Antennas and Wireless Propagation Implementing Metamaterial Structures)

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Figure 1

Open AccessArticle

Wideband Circularly Polarized Antenna Based on a Non-Uniform Metasurface

Tuan Tu Le

Huy Hung Tran

and

Ayman Abdulhadi Althuwayb

Appl. Sci. 2020, 10(23), 8652; https://doi.org/10.3390/app10238652 - 03 Dec 2020

Cited by 12 | Viewed by 2500

Abstract

This paper presents a non-uniform metasurface (MS)-based circularly polarized (CP) antenna that is able to perform with a wideband operation characteristic. A squared patch with truncated corners was chosen as a radiating CP source. Then, unlike the conventional CP MS antennas with a uniform MS, the proposed design employed a non-uniform MS placed above the driven patch. Apart from increasing the impedance bandwidth, the non-uniform MS was also capable of generating two additional CP bands in the high-frequency region, which contributed to significantly increasing the antenna’s overall performance. For demonstration, an antenna prototype was fabricated and experimentally tested. The measured operating bandwidth of the fabricated antenna was about 30% and the broadside gain within this band was around 6.6 dBic. Compared to the other reported CP MS antennas in the open literature, the proposed design has the advantages of very wideband operation with a comparable size and gain. Full article

(This article belongs to the Special Issue Antennas and Wireless Propagation Implementing Metamaterial Structures)

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Review

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Open AccessFeature PaperReview

Mechanically Reconfigurable, Beam-Scanning Reflectarray and Transmitarray Antennas: A Review

Mohammad Mahdi Honari

John H. Booske

and

Nader Behdad

Appl. Sci. 2021, 11(15), 6890; https://doi.org/10.3390/app11156890 - 27 Jul 2021

Cited by 7 | Viewed by 2669

Abstract

We review mechanically reconfigurable reflectarray (RA) and transmitarray (TA) antennas. We categorize the proposed approaches into three major groups followed by a hybrid category that is made up of a combination of the three major approaches. We discuss the examples in each category and compare their performance metrics including aperture efficiency, gain, bandwidth and scanning range and resolution. We also identify opportunities to build upon or extend these demonstrated approaches to realize further advances in antenna performance. Full article

(This article belongs to the Special Issue Antennas and Wireless Propagation Implementing Metamaterial Structures)

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