Advances in Applications of Metamaterials and Metasurfaces

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

Deadline for manuscript submissions: closed (30 December 2023) | Viewed by 937

Special Issue Editor

Lecturer in Electrical and Electronic Engineering, School of Engineering and the Built Environment, Edinburgh Napier University, 10 Colinton Rd, Edinburgh EH10 5DT, UK
Interests: metamaterials; metasurfaces; near-zero index materials; sensors; medical diagnostics; electromagnetics; sound waves; heat waves; fluid dynamics; classical mechanics
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Special Issue Information

Dear Colleagues,

Metamaterials and metasurfaces have garnered widespread attention in recent times due to their exceptional and highly adjustable properties. These materials are artificially designed structures constituted of bulk metallic and/or dielectric elements that exhibit remarkable electromagnetic responses, breaking the boundaries of natural materials. As a result, they exhibit vastly different electromagnetic behavior compared to traditional materials. Metamaterials are applied to a broad range of fields in physics and engineering, including electromagnetics, acoustics, mechanics, and thermodynamics.

Metasurfaces, on the other hand, are two-dimensional functional structures constituted of multiple subwavelength unit structures. It is possible to create new physical phenomena, including negative refraction, negative reflection, polarization rotation, convergent imaging, complex beams, and the conversion of propagating waves to surface waves.

Both metamaterials and metasurfaces have led to remarkable advancements in several fields, including optical imaging, molecular sensing, catalysis, manufacturing, data storage, medical therapy, and energy conversion. Despite such achievements, there are still some practical challenges to overcome to achieve their full potential. You are invited to submit your work for consideration in our Special Issue.

Dr. Luigi La Spada
Guest Editor

Manuscript Submission Information

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Published Papers (1 paper)

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Research

12 pages, 5348 KiB  
Article
Subwavelength-Cavity High-Gain Circularly Polarized Antenna with Planar Metamaterials
Appl. Sci. 2023, 13(13), 7665; https://doi.org/10.3390/app13137665 - 28 Jun 2023
Viewed by 795
Abstract
We present a specific subwavelength-cavity high-gain circularly polarized ultra-thin antenna made of planar metamaterials. The antenna is designed to operate at 2.80 GHz with a fixed thickness of approximately 1/6 of the operating wavelength in free space. The asymmetric unit cells of the [...] Read more.
We present a specific subwavelength-cavity high-gain circularly polarized ultra-thin antenna made of planar metamaterials. The antenna is designed to operate at 2.80 GHz with a fixed thickness of approximately 1/6 of the operating wavelength in free space. The asymmetric unit cells of the metamaterial antenna exhibit two characteristics, namely, negative permeability and polarization selection. A linear-polarization micro-strip patch, which can realize circular polarization without a complicated feeding network, is embedded in the cavity as a feed. The circular polarization mode of the antenna can be changed by simply rotating the planar metamaterial horizontally. Simulations and experiments conducted on this antenna yielded results that are in good agreement with each other. This new subwavelength planar antenna can have potentially important applications in communication, early warning systems, and radio observation. Full article
(This article belongs to the Special Issue Advances in Applications of Metamaterials and Metasurfaces)
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