Nature-Inspired Mechanical Metamaterials

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 3069

Special Issue Editors

Department Applied Science and Technology, Politecnico di Torino, 10138 Torino TO, Italy
Interests: bioinspiration; metamaterials; elasticity
Institut d'électronique de microélectronique et de nanotechnologie (IEMN, UMR 8520) CNRS, France
Interests: phononic crystals; metamaterials; topological protection; nondestructive evaluation; bio-inspiration; seismic engineering
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent years, phononic crystals and elastic metamaterials have provided new opportunities for wave control and a wealth of applications have been proposed in acoustics and vibration control. In parallel, the development of elastic metamaterials has also lead to lightweight microstructured designs exhibiting exceptional quasistatic mechanical properties.

However, no universally valid criteria exist for the design of efficient metamaterial structures, both in the quasistatic and the dynamic domains. A promising new approach in the development of advanced architectures for new materials consists in drawing inspiration from Nature, which has developed complex designs with advanced properties and functionalities through evolution, over thousands or millions of years.

Bioinspiration has already enabled the design of structures with optimized mechanical properties such as strength or toughness. Since metamaterials derive their unconventional behaviour from structure rather than from material properties, biological systems are ideal candidates as a source of inspiration.

This Special Issues welcomes contributions related to the mechanics of Bioinspired metamaterials, both for the control of wave propagation and for the achievement of unconventional quasistatic properties, at various size scales and in various engineering fields. Submissions are expected related to investigations on analytical and numerical approaches for novel optimized bioinspired designs, as well as their fabrication and experimental verification.

Prof. Dr. Federico Bosia
Dr. Marco Miniaci
Guest Editors

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Keywords

  • Bioinspiration
  • Phononic Crystals and Metamaterials
  • Elasticity
  • Wave dynamics
  • Acoustics
  • Vibration Control

Published Papers (1 paper)

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Research

13 pages, 6587 KiB  
Article
Dual Band Electrically Small Complementary Double Negative Structure Loaded Metamaterial Inspired Circular Microstrip Patch Antenna for WLAN Applications
by Shiney Thankachan and Binu Paul
Appl. Sci. 2022, 12(6), 3035; https://0-doi-org.brum.beds.ac.uk/10.3390/app12063035 - 16 Mar 2022
Viewed by 2265
Abstract
In this article, a compact dual band metamaterial inspired circular microstrip patch antenna for WLAN applications is presented. The antenna consists of a circular patch loaded with a complementary double negative metamaterial structure which produces a percentage miniaturisation of 60.7%. The circular microstrip [...] Read more.
In this article, a compact dual band metamaterial inspired circular microstrip patch antenna for WLAN applications is presented. The antenna consists of a circular patch loaded with a complementary double negative metamaterial structure which produces a percentage miniaturisation of 60.7%. The circular microstrip patch antenna used for developing the proposed antenna has a resonant frequency of 6.2 GHz with an impedance bandwidth of 3.5% before the metamaterial structure is applied upon it. The loading of the proposed metamaterial structure inspires the antenna to lower its resonant frequency with enhanced bandwidth and generate one additional resonance. The designed antenna can be tuned throughout the C-band by simply altering the size of the metamaterial structure loaded upon it. However, the prototype of the antenna is designed for the most commonly used wireless communication bands at 2.4 GHz and 5.2 GHz. The 10 dB impedance bandwidth of 1.63% at 2.4 GHz and 13.15% at 5.2 GHz are achieved by this design. The electrical parameters of the proposed antenna are ka = 0.72 and QChu = 4.07 rendering it electrically small. This electrical compactness and bandwidth enhancement are caused by the loading of metamaterial structure. The proposed antenna is fabricated on low cost FR4 substrate and has an overall compact electrical size of 0.164 λ0 × 0.164 λ0 × 0.013 λ0 and physical dimensions 20 × 20 × 1.6 mm3, with peak gain 3.8 dBi and 2.9 dBi at 2.4 GHz and 5.2 GHz respectively. Full article
(This article belongs to the Special Issue Nature-Inspired Mechanical Metamaterials)
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