Symmetry in Antenna Theory and Design

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: 31 October 2024 | Viewed by 3581

Special Issue Editors


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Guest Editor
Department of Electromagnetic Field, Faculty of Electrical Engineering, Czech Technical University in Prague, 16636 Prague, Czech Republic
Interests: antenna theory and design; electromagnetic field; small antennas; feeds for reflector antennas; fractals
Department of Electromagnetic Field, Faculty of Electrical Engineering, Czech Technical University in Prague, 16636 Prague, Czech Republic
Interests: electromagnetic field theory; antenna theory; antenna arrays; wireless power transfer; RFID technology
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Special Issue Information

Dear Colleagues,

We are pleased to invite you to participate in the Special Issue of the MDPI Symmetry journal with the title Symmetry in Antenna Theory and Design.

Symmetry plays a crucial role in natural sciences, and, consequently, increasing interest in utilizing symmetry has appeared in the area of antenna theory and design. In the case of modal approaches of antenna theory, consideration of symmetry can enable the design of uncorrelated channels and orthogonal radiation states for antennas, tracking of modes by sweeping of design parameters, and investigation of fundamental electromagnetic bounds. The introduction of higher symmetry, e.g., glide or twist symmetry, into periodic structures described by a unit cell is expected to yield improvement in their properties, such as increase of bandwidth, reduction of losses, or resistance to defects.

Therefore, seeing the potential in utilization of symmetry in antennas and, generally, in electromagnetics, we would like to present the current advances in this topical field through this Special Issue. Original research articles and reviews are welcome. Research areas related to the topic of symmetry in antennas and electromagnetics may include, but are not limited to, the following:

  • Channel correlation;
  • Characteristic modes;
  • Fundamental bounds;
  • Group theory;
  • Higher symmetry;
  • Metamaterials, artificial materials, and frequency selective surfaces;
  • MIMO, multimode, and multiport antennas;
  • Modal decomposition;
  • Mutual coupling;
  • Unit cell approaches to radiation and scattering;
  • Other topics.

Dr. Pavel Hazdra
Dr. Jan Kracek
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. Symmetry 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 2400 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

  • antenna theory
  • antenna design
  • electromagnetics
  • channel correlation
  • characteristic modes
  • fundamental bounds
  • group theory
  • higher symmetry
  • metamaterials
  • artificial materials
  • frequency selective surfaces
  • MIMO antennas
  • multimode antennas
  • multiport antennas
  • modal decomposition
  • mutual coupling
  • unit cell
  • radiation
  • scattering

Published Papers (2 papers)

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Research

15 pages, 1698 KiB  
Article
Deep Learning-Based Cross-Layer Power Allocation for Downlink Cell-Free Massive Multiple-Input–Multiple-Output Video Communication Systems
by Wen-Yen Lin, Tin-Hao Chang and Shu-Ming Tseng
Symmetry 2023, 15(11), 1968; https://doi.org/10.3390/sym15111968 - 24 Oct 2023
Cited by 2 | Viewed by 1087
Abstract
We propose a deep learning-based cross-layer power allocation method for asymmetric cell-free massive MIMO video communication systems. The proposed cross-layer approach considers physical layer channel state information (CSI) and the application layer rate distortion (RD) function, and it aims to enhance video quality [...] Read more.
We propose a deep learning-based cross-layer power allocation method for asymmetric cell-free massive MIMO video communication systems. The proposed cross-layer approach considers physical layer channel state information (CSI) and the application layer rate distortion (RD) function, and it aims to enhance video quality in terms of peak signal-to-noise ratio (PSNR). Our study develops a decentralized deep neural network (DNN) model to capture intricate system patterns, enabling accurate and efficient power allocation decisions. The proposed cross-layer approach includes unsupervised and hybrid (supervised/unsupervised) learning models. The numerical results show that the hybrid method achieves convergence with just 50% of the iterations required by the unsupervised learning model and that it achieves a 1 dB gain in PSNR over the baseline physical layer scheme. Full article
(This article belongs to the Special Issue Symmetry in Antenna Theory and Design)
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28 pages, 3426 KiB  
Article
Reciprocity and Representations for Wave Fields in 3D Inhomogeneous Parity-Time Symmetric Materials
by Kees Wapenaar and Evert Slob
Symmetry 2022, 14(11), 2236; https://doi.org/10.3390/sym14112236 - 25 Oct 2022
Viewed by 1249
Abstract
Inspired by recent developments in wave propagation and scattering experiments with parity-time (PT) symmetric materials, we discuss reciprocity and representation theorems for 3D inhomogeneous PT-symmetric materials and indicate some applications. We start with a unified matrix-vector wave equation which accounts [...] Read more.
Inspired by recent developments in wave propagation and scattering experiments with parity-time (PT) symmetric materials, we discuss reciprocity and representation theorems for 3D inhomogeneous PT-symmetric materials and indicate some applications. We start with a unified matrix-vector wave equation which accounts for acoustic, quantum-mechanical, electromagnetic, elastodynamic, poroelastodynamic, piezoelectric and seismoelectric waves. Based on the symmetry properties of the operator matrix in this equation, we derive unified reciprocity theorems for wave fields in 3D arbitrary inhomogeneous media and 3D inhomogeneous media with PT-symmetry. These theorems form the basis for deriving unified wave field representations and relations between reflection and transmission responses in such media. Among the potential applications are interferometric Green’s matrix retrieval and Marchenko-type Green’s matrix retrieval in PT-symmetric materials. Full article
(This article belongs to the Special Issue Symmetry in Antenna Theory and Design)
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