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Crystals
Special Issues
Metamaterials and Metasurfaces for Microwave and THz Applications
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Metamaterials and Metasurfaces for Microwave and THz Applications

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Hybrid and Composite Crystalline Materials".

Deadline for manuscript submissions: closed (31 August 2023) | Viewed by 5727

Special Issue Editors

Dr. Kerlos Atia Abdalmalak

E-Mail Website
Guest Editor
Signal Theory and Communication Department, University Carlos III of Madrid, Madrid, Spain
Interests: ultra-wideband (UWB)/multiband antennas; radio astronomy receivers; satellite remote sensing; 5G MIMO communications; metasurfaces antennas; RF circuit design; microwave/optical measurements; mm wave/THz technologies; whispering gallery mode resonators
Prof. Dr. Raed Shubair

E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering, New York University - Abu Dhabi Campus, Abu Dhabi, United Arab Emirates
Interests: RF/microwave technologies; smart integrated antennas and radio systems; mm-wave/terahertz integrated technologies; metamaterialnano-EM and photonics; EM in health science and biomedicine; bioelectromagnetics; medical sensing; new EM materials; wireless sensors and networks wireless communications
Dr. Ayman Althuwayb

E-Mail Website
Guest Editor
Department of Electrical Engineering, College of Engineering, Jouf University, Sakaka 72388, Saudi Arabia
Interests: metamaterial and metasurface principles; antenna design; antenna arrays; sensors filters
Prof. Dr. Bal S. Virdee

E-Mail Website
Guest Editor
Center for Communications Technology, School of Computing & Digital Media, London Metropolitan University, London N7 8DB, UK
Interests: reconfigurable devices; techniques to suppress spurii in filters for electromagnetic compatible (EMC) systems; photonic band-gap (PBG) miniaturisation; Novel microstrip resonators for frequency selective applications using fractals and metamaterial phenomena; efficient high-power RF amplifiers; ultra-broadband amplifiers; novel RF high power amplifier design technique for cellular base-stations; ultra-low noise tuneable reference oscillators with low phase noise; broad tuning low noise voltage controlled oscillators (VCO); efficient low-noise oscillators; linear broadband highly efficient power amplifiers; multimode filters; ultra-broadband frequency discriminating devices; low-profile miniature antennas; UWB communications

Special Issue Information

Dear Colleagues,

With the rapid development of devices working at microwave and THz ranges, metamaterials and metasurfaces have attracted increasing attention. For instance, in wireless systems (such as communication, sensing, and wireless power transfer applications), metamaterials play an essential role in antenna design, where sub-wavelength unit cells are combined with standard antenna topologies to enhance their performance in terms of bandwidth, gain, polarization conversion, reconfigurability, and many other aspects.

Even in the aforementioned applications, devolvement is not restricted to antenna design but includes other system perspectives, such as suppressing mutual coupling in antenna arrays, which is crucial for MIMO systems, and other system components, such as guided wave components and filters, which can be made more efficient and compact via the use of metamaterials. Although early research on metamaterials was largely oriented towards systems in the microwave and optical regions, recently it has been extended to millimeter-wave and THz frequencies as candidates for fulfilling the THz gap where efficient modulators, switches, and other components can be designed.

This Special Issue is dedicated to recent advances in the development of systems based on metamaterials in the microwave and THz ranges. Topics of interest include, but are not limited to, the following:

  • Metasurface antennas;
  • Millimeter-wave and THz metamaterials;
  • Metasurface-inspired MIMO systems;
  • Characteristic mode analysis (CMA) of metasurfaces;
  • 3D printing metamaterials;
  • Energy harvesting and wireless power transfer using metamaterials;
  • Numerical modelling of metamaterials;
  • Metamaterial polarization converters;
  • Metamaterial waveguides and filters;
  • Low-cost metamaterial structures;
  • Metamaterials for physics applications;
  • Non-uniform metasurfaces.

Dr. Kerlos Atia Abdalmalak
Prof. Dr. Raed Shubair
Dr. Ayman Althuwayb
Prof. Dr. Bal S. Virdee
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • metamaterials and metasurfaces
  • artificial composite materials
  • split-ring resonator (SRR)
  • sensors
  • microwave circuits
  • terahertz applications
  • antennas and propagation
  • multiple-input multiple-output (MIMO)
  • wireless power transfer (WPT)
  • wireless communication systems
  • reconfigurable intelligent surfaces (RIS)

Published Papers (5 papers)

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Research

12 pages, 3596 KiB  
Article
Layered Structure Based on PANi and SiO2 to Absorb HPM to Protect Systems and Devices
by Essameldin M. Sheta and Adrian T. Sutinjo
Crystals 2024, 14(5), 391; https://doi.org/10.3390/cryst14050391 - 23 Apr 2024
Viewed by 300
Abstract
A layered structure composed of polyaniline (PANI) and silicon dioxide (SiO2) is proposed in this article. It was developed to obtain ultra-wideband and high-power microwave absorption. Due to the high thermal stability of PANi and SiO2 above 400 °C, the [...] Read more.
A layered structure composed of polyaniline (PANI) and silicon dioxide (SiO2) is proposed in this article. It was developed to obtain ultra-wideband and high-power microwave absorption. Due to the high thermal stability of PANi and SiO2 above 400 °C, the proposed structure is able to absorb high amounts of power. The electromagnetic behavior of the structure is examined by full-wave simulation to investigate its ability to absorb microwave frequencies ranging from 1 to 20 GHz under both normal and oblique incidences of electromagnetic waves. Recent studies have produced results with a limited absorption range and a less consistent angular incidence than the structure presently being examined. Also, the layer-by-layer deposition of thin film facilitates the manufacturing procedure. Furthermore, owing to the high thermal stability of the proposed structure, the absorption of high-power microwaves is superior to that of alternative methodologies. Full article
(This article belongs to the Special Issue Metamaterials and Metasurfaces for Microwave and THz Applications)
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13 pages, 4296 KiB  
Article
Ultra-Wideband Terahertz Wave Absorber Using Vertically Structured IGIGIM Metasurface
by Muhammad Asif, Qiong Wang, Zhengbiao Ouyang, Mi Lin and Zixian Liang
Crystals 2024, 14(1), 22; https://doi.org/10.3390/cryst14010022 - 25 Dec 2023
Cited by 3 | Viewed by 915
Abstract
Achieving perfect absorption of electromagnetic waves across a wide range of frequencies is crucial for various applications, including sensing, imaging, and energy capture. In this study, we introduced a new concept for metasurfaces and proposed a six-layer vertically structured IGIGIM metasurface consisting of [...] Read more.
Achieving perfect absorption of electromagnetic waves across a wide range of frequencies is crucial for various applications, including sensing, imaging, and energy capture. In this study, we introduced a new concept for metasurfaces and proposed a six-layer vertically structured IGIGIM metasurface consisting of gold (Au), silicon (Si), graphene (G1), silica (SiO2), a second layer of graphene (G2), and polymethyl methacrylate (PMMA), which demonstrates ultra-wideband absorptance in the terahertz (THz) region. Through theoretical analysis and numerical simulations, we obtained broadband absorptance over 80% with the average absorptance of 92.6% and a bandwidth of 8.22 THz, from 1.78 to 10.0 THz. Whereas, dual broadband absorptance was obtained for above 90% with the bandwidth of 5.63 THz in the two sub-bands of 2.09–3.5 THz and 5.78–10 THz and above 95% with the bandwidth of 3.63 THz in the two sub-bands of 2.32–3.12 THz and 6.35–9.9 THz. Moreover, the proposed structure exhibits a polarization-independent absorption property. Also, it demonstrates a tolerance for the incident angle of 40 degrees, maintaining a wide absorption band. This remarkable feature is attributed to the multiple Fabry–Pérot resonance absorptions in the structure. Our study presents a convenient method for designing high-quality terahertz wave absorbers with outstanding broadband absorptance. Full article
(This article belongs to the Special Issue Metamaterials and Metasurfaces for Microwave and THz Applications)
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10 pages, 3154 KiB  
Article
Improved Huygens’ Principle for Metamaterial
by Wei Huang, Dan Liu, Xiaowei Qu, Shan Yin, Song Ye and Wentao Zhang
Crystals 2023, 13(12), 1619; https://doi.org/10.3390/cryst13121619 - 22 Nov 2023
Viewed by 767
Abstract
In this paper, we propose a new method based on Huygens’ principle for calculations of transmission spectra with weak coupling and we call this method an improved Huygens’ principle. The original Huygens’ principle for metamaterial can only deal with transmission spectra without coupling [...] Read more.
In this paper, we propose a new method based on Huygens’ principle for calculations of transmission spectra with weak coupling and we call this method an improved Huygens’ principle. The original Huygens’ principle for metamaterial can only deal with transmission spectra without coupling between metamaterial structures. Our improved Huygens’ principle can give the approximate calculations of transmission spectra while considering coupling by employing the original Huygens’ principle. We demonstrate our method by employing full-wave simulations and experimental results. Full article
(This article belongs to the Special Issue Metamaterials and Metasurfaces for Microwave and THz Applications)
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10 pages, 5484 KiB  
Communication
Linear-to-Dual-Circular Polarization Decomposition Metasurface Based on Rotated Trimming-Stub-Loaded Circular Patch
by Tao Zhang, Haoran Wang, Chongmei Peng and Zhaohui Chen
Crystals 2023, 13(5), 831; https://doi.org/10.3390/cryst13050831 - 17 May 2023
Cited by 1 | Viewed by 1134
Abstract
This paper presents a linear-to-dual-circular polarization metasurface decomposer, which decomposes a linearly polarized (LP) planar incident wave into a pair of circular polarized (CP) waves, namely, a right-handed circular polarized (RHCP) wave and a left-handed circular polarized (LHCP) wave, and scatters them into [...] Read more.
This paper presents a linear-to-dual-circular polarization metasurface decomposer, which decomposes a linearly polarized (LP) planar incident wave into a pair of circular polarized (CP) waves, namely, a right-handed circular polarized (RHCP) wave and a left-handed circular polarized (LHCP) wave, and scatters them into different directions. The proposed metasurface polarization decomposer is composed of a series of rotated trimming stub loaded circular patches. The two CP components are excited due to the perturbation introduced by the trimming stubs, and the different phase gradients added to the RHCP and LHCP components are realized by rotating the circular patches with different angles. A 12×12 metasurface polarization decomposer is designed, fabricated, and measured, which scatters the RHCP and LHCP into −30∘ and 30∘, respectively. The simulated and measured results agree well with each other, which demonstrates the proposed design. Full article
(This article belongs to the Special Issue Metamaterials and Metasurfaces for Microwave and THz Applications)
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18 pages, 6741 KiB  
Article
Highly Efficient and Multiband Metamaterial Microstrip-Based Radiating Structure Design Showing High Gain Performance for Wireless Communication Devices
by Ammar Armghan, Sunil Lavadiya, Meshari Alsharari, Khaled Aliqab, Malek G. Daher and Shobhit K. Patel
Crystals 2023, 13(4), 674; https://doi.org/10.3390/cryst13040674 - 14 Apr 2023
Cited by 4 | Viewed by 1796
Abstract
High-speed wireless communication devices need antennas to operate at multiple frequencies with high gain. The need for such antennas is increasing day by day. The proposed metamaterial superstrate antenna gives a high gain and multiband performance, which is required in high-speed wireless communication [...] Read more.
High-speed wireless communication devices need antennas to operate at multiple frequencies with high gain. The need for such antennas is increasing day by day. The proposed metamaterial superstrate antenna gives a high gain and multiband performance, which is required in high-speed wireless communication devices. The designed antenna is also applicable for C- and X-band communication devices. The structure consists of a simple patch and multiple split-ring resonator metamaterials on the superstrate region. The performance optimization is achieved by adjusting the feed position, varying the height of the superstrate layer and changing the thickness of metamaterial rings. The proposed design is analyzed for 4 GHz to 12 GHz. The performance analysis regarding the reflection coefficient, directivity, gain and electric field is observed. FR4 is used as a dielectric material that makes the design low-cost. The proposed design represents a minimum reflection coefficient response of −49 dB, a bandwidth of 490 MHz, a maximum electric field of 1.29 × 104 v/m, good directivity and a broader radiation pattern. The comparison between the simulated and the measured results is incorporated in the manuscript. A comparison of the presented design with other articles is included to check the novelty of the design. The proposed method helps to target applications such as WiFi, Earth observation and microwave links. Full article
(This article belongs to the Special Issue Metamaterials and Metasurfaces for Microwave and THz Applications)
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