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Dr. William Whittow

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Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough LE11 3TU, UK
Interests: 3D printing; antennas; artificial dielectrics; dielectric property measurements; embroidered antennas; energy harvesting; heterogeneous substrates; implanted antennas; inkjet printing; metamaterials; metasurfaces; RFID tags; specific absorption rates (SAR); wearable antennas
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Dr. Syed Bukhari

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Department of Materials, University of Oxford, Wellington Square, Oxford OX1 2JD, UK
Interests: metasurfaces; metamaterials; 3D printing; dielectric characterisation

Special Issue Information

Dear Colleagues,

Electromagnetics is an area of rapid growth, with applications ranging from the internet of things to sensing and imaging. Wireless communication is an area that affects everyone’s lives without their noticing. The science and engineering behind this technology goes over the heads of many, but some of us stop and think “How could we make this better?”

This Special Issue of the journal Applied Sciences “Frequency Selective Surfaces” aims to cover recent advances in the development of FSS. This includes topics such as 3D-printing and new manufacturing techniques; conformal FSS; reconfigurable FSS; novel applications of FSS; numerical analysis; FSS at high mm-wave and low THz frequencies; and polarization-dependent FSS.

Dr. William Whittow
Dr. Syed Bukhari
Guest Editors

Manuscript Submission Information

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Keywords

Frequency selective surfaces
FSS
metasurfaces
metamaterials

Published Papers (3 papers)

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Research

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28 pages, 1892 KiB

Open AccessArticle

Generalized Boundary Conditions in Surface Electromagnetics: Fundamental Theorems and Surface Characterizations

by Xiao Liu, Fan Yang, Maokun Li and Shenheng Xu

Appl. Sci. 2019, 9(9), 1891; https://doi.org/10.3390/app9091891 - 08 May 2019

Cited by 41 | Viewed by 4191

Abstract

Generalized boundary conditions (GBCs) for electromagnetic surfaces are investigated in this paper, which can be used to analytically characterize field discontinuities across two-dimensional surfaces. First, five representative features are described to categorize various surface problems which require proper GBC-based characterization procedures. Next, the generalized boundary conditions are discussed in details, in association with impedance boundary conditions, generalized sheet transition conditions, and surface scattering coefficients. Then an extraction method for surface susceptibilities, the characteristic parameters of surfaces in GBCs, are proposed and validated. Finally, to illustrate the applications of GBCs, two representative surface problems are demonstrated, namely, isolated-aperture surface analysis and surface-wave mode characterization. For the isolated-aperture surface, a characterization procedure is derived based on GBCs and Babinet’s principle, and the accuracy is validated through comparison with full-wave simulations. For surface wave analysis, a characterization procedure is also developed from GBCs, and the feasibility is verified by numerical examples as well. Full article

(This article belongs to the Special Issue State-of-the-Art Frequency Selective Surfaces (FSSs))

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Graphical abstract

12 pages, 5371 KiB

Open AccessArticle

A 60-GHz Ultra-Thin and Flexible Metasurface for Frequency-Selective Wireless Applications

by Syeda Fizzah Jilani, Oluyemi P. Falade, Tom Wildsmith, Paul Reip and Akram Alomainy

Appl. Sci. 2019, 9(5), 945; https://doi.org/10.3390/app9050945 - 06 Mar 2019

Cited by 14 | Viewed by 4066

Abstract

This paper demonstrates a design, fabrication and performance evaluation of a frequency selective 60-GHz flexible metasurface in order to facilitate an unobstructed, secure, and low-loss high-frequency signal propagation. The high-attenuation 60 GHz millimeter-wave (MMW) band is selected for the design of a broadband metasurface. The symmetric metasurface unit-cell structure comprises of an assembly of a circular metallic ring embedded with a square-shaped ring. The screen printing process is deployed to perform fabrication of the metasurface on flexible films by means of highly-conductive nanoparticle copper pastes. Electromagnetic (EM) characteristics of the proposed structure are examined by using the quasi-optic bench testing facility in order to validate its potential contribution in the high data-rate communication links. The proposed ultra-thin and flexible metasurface can be integrated on walls and windows as wallpaper to enhance the wireless signal propagation in highly-dense indoor scenarios. Full article

(This article belongs to the Special Issue State-of-the-Art Frequency Selective Surfaces (FSSs))

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Figure 1

Review

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14 pages, 430 KiB

Open AccessReview

A Metasurfaces Review: Definitions and Applications

by Syed S. Bukhari, J (Yiannis) Vardaxoglou and William Whittow

Appl. Sci. 2019, 9(13), 2727; https://doi.org/10.3390/app9132727 - 05 Jul 2019

Cited by 163 | Viewed by 11423

Abstract

This paper is a critical review of metasurfaces, which are planar metamaterials. Metamaterials offer bespoke electromagnetic applications and novel properties which are not found in naturally occurring materials. However, owing to their 3D-nature and resonant characteristics, they suffer from manufacturing complexity, losses and are highly dispersive. The 2-dimensional nature of metasurfaces allows ease of fabrication and integration into devices. The phase discontinuity across the metasurface offers anomalous refraction, thereby conserving the good metamaterial properties while still offering the low-loss characteristics. The paper discusses salient features and applications of metasurfaces; wavefront shaping; phase jumps; non-linear metasurfaces; and their use as frequency selective surfaces (FSS). Full article

(This article belongs to the Special Issue State-of-the-Art Frequency Selective Surfaces (FSSs))

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