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Electronics
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Flexible Antenna for Microwave Application
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Flexible Antenna for Microwave Application

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Networks".

Deadline for manuscript submissions: closed (15 April 2024) | Viewed by 2130

Special Issue Editors

Prof. Dr. Dalia Nashaat

E-Mail Website
Guest Editor
Microstrip Department, Electronics Research Institute, Nozha, Cairo 11843, Egypt
Interests: antennas; biosensors; microstrips; passive microwave elements; microwave sensing; electromagnetic waves; microstrip planar components
Dr. Angie Reda Eldamak

E-Mail Website
Guest Editor
Electronics & Communications Engineering Department, Faculty of Engineering, Ain Shams University, Cairo, 11517, Egypt
Interests: antennas; biosensors; microwave sensing; electromagnetic waves; passive microwave elements and systems; microstrips; planar structures

Special Issue Information

Dear Colleagues,

Flexible antennas are growing exponentially due to the demand for wearable technologies, Internet of Things (IoT) frameworks, point-of-care devices, custom medical platforms, 5G technology, wireless sensor networks, and small-form factor communications devices. to name a few, field. The choice of a non-rigid antenna is application-specific and depends on the type of substrate, materials used, processing methods, antenna performance and environmental factors. Numerous design advancements, novel materials and their qualities, innovative production techniques, and specialized applications exist. The demand for wearable and implantable devices for health monitoring systems and everyday wireless devices is one of the factors driving the rapid growth of the flexible wireless device market (e.g., cell phones, laptop computers, wearables, etc.). This has led to an upsurge in the development of flexible antennas in recent years, particularly for biomedical applications. This Special Issue will focus on flexible antennas and microwave components, materials, fabrication technologies, performance validation, and design requirements. This Special Issue will concentrate on the inherent difficulties and novel applications of flexible microwave components in future wireless technologies.

Prof. Dr. Dalia Nashaat
Dr. Angie Reda Eldamak
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. Electronics is an international peer-reviewed open access semimonthly 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

  • antennas
  • imaging
  • head
  • antenna measurements
  • microwave antennas
  • impedance
  • antenna arrays
  • millimeter wave technology
  • apertures
  • microwave communication
  • microwave filters
  • biomedical monitoring

Published Papers (2 papers)

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Research

23 pages, 856 KiB  
Article
Post-Cancellation-Based LLR Refining for MIMO Multiple ARQ Systems
by Sangjoon Park
Electronics 2024, 13(1), 200; https://doi.org/10.3390/electronics13010200 - 02 Jan 2024
Viewed by 503
Abstract
In multiple-input multiple-output (MIMO) multiple automatic repeat request (ARQ) systems, multiple streams with independent hybrid ARQ (HARQ) processes can be simultaneously sent. Thus, the interference from other streams can affect future retransmissions of a packet as well as the current transmission, and proper [...] Read more.
In multiple-input multiple-output (MIMO) multiple automatic repeat request (ARQ) systems, multiple streams with independent hybrid ARQ (HARQ) processes can be simultaneously sent. Thus, the interference from other streams can affect future retransmissions of a packet as well as the current transmission, and proper management of interference at the receiver is required. Therefore, in this paper, a post-cancellation-based log-likelihood ratio (LLR) refining scheme is proposed for MIMO multiple ARQ (MMARQ) systems. In the proposed scheme, after the end of the entire conventional reception procedure for packet decoding, LLR refining is performed for the non-terminated packets that will be sent during the next transmission time interval. For LLR refining, the packet cancellation is performed to cancel only the successfully decoded packets. Thus, the LLRs of the non-terminated packets are refined without any error propagation, including the inter-transmission error propagation. Consequently, the proposed scheme can compensate for the interference problem in MMARQ systems and improve system performance. In order to utilize the error detection results of decoded codewords, the proposed scheme should be performed after the end of the entire reception procedure for packet decoding. Therefore, as the post-processing scheme, the proposed scheme can be employed to any existing LLR-level combining-based MMARQ receiver without changing the original procedure. Simulation results verify that the proposed scheme can significantly improve the error performance and throughput of MMARQ systems, especially for hard-decision interference cancellation-based receivers and high-order modulation. In addition, compared with the conventional reception procedure, the proposed scheme requires a smaller computational complexity in most of the simulated SNR region. Therefore, the proposed LLR refining scheme can be considered as an effective and practical post-processing scheme for an MMARQ receiver. Full article
(This article belongs to the Special Issue Flexible Antenna for Microwave Application)
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15 pages, 14777 KiB  
Article
A Miniaturized Thin-Film UWB Monopole Antenna Implemented with High-Dk Adhesive
by Duc Nguyen Dao and Jae-Young Chung
Electronics 2023, 12(16), 3445; https://doi.org/10.3390/electronics12163445 - 15 Aug 2023
Cited by 2 | Viewed by 1285
Abstract
This paper presents the design of a miniaturized polyimide-based antenna for ultra-wideband (UWB) communication. Miniaturization is achieved through the utilization of adhesive material with a high dielectric constant (high-Dk). The goal of this work is to investigate the impact of such material on [...] Read more.
This paper presents the design of a miniaturized polyimide-based antenna for ultra-wideband (UWB) communication. Miniaturization is achieved through the utilization of adhesive material with a high dielectric constant (high-Dk). The goal of this work is to investigate the impact of such material on the antenna performance and to optimize its design for UWB operation. The manufacturing of the antenna using the proposed structure is developed, and the prototype of an antenna for the UWB high band (6–9 GHz) is measured and analyzed. By leveraging the high Dk of the adhesive material, the simulation and measurement results show that the proposed antenna with a high-Dk adhesive film can achieve compact dimensions with good performance in terms of the gain and time domain characteristics. The results of this study show the potential of exhibiting a reduction in the size of the antenna and will contribute to the advancement of miniaturized UWB antenna technology. Full article
(This article belongs to the Special Issue Flexible Antenna for Microwave Application)
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