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Technologies
Special Issues
Microwave/Millimeter-Wave Future Trends and Technologies
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Microwave/Millimeter-Wave Future Trends and Technologies

A special issue of Technologies (ISSN 2227-7080). This special issue belongs to the section "Information and Communication Technologies".

Deadline for manuscript submissions: 30 November 2025 | Viewed by 692

Special Issue Editors

Dr. Yasir I. A. Al-Yasir

E-Mail Website
Guest Editor
School of Electronic Engineering and Computer Science, Queen Mary University of London, London E1 4NS, UK
Interests: radio frequency design；communication systems; microwave antennas; microwave filters; 5G
Special Issues, Collections and Topics in MDPI journals
Dr. Sunday Ekpo

E-Mail Website
Guest Editor
Department of Engineering, Manchester Metropolitan University, Manchester M1 5GD, UK
Interests: antenna and propagation engineering; artificial intelligence; beamforming; RF biosensors; Internet of Things; radio communication; satellite broadcast solutions; space systems engineering

Special Issue Information

Dear Colleagues,

The next generation of microwave/millimeter-wave applications, such as 6G, WiFi 7, and WiFi 8, are emerging key trends that will drive the future RF electronics markets starting in 2025. They will dominate not only the RF and microwave components but also various important applications in the health, telecom, space, and defense sectors. As the commercial deployment of 5G technology progresses in many countries, researchers are now focusing on what comes next. Thus, it is reasonable to expect the release of “6G” at some point in the future.

This Special Issue invites researchers and RnD engineers to contribute original research articles and review papers that address the challenges, future trends, and new technologies in the design and application of new microwave/millimeter-wave circuits for 5G and 6G systems to support the significant demands of this fast-evolving era. The sub-systems include but are not limited to antennas, filters, power amplifiers, phase shifters, power dividers, mixers, multiplexers, ceramics, and integrated systems. These components could incorporate recent RF technologies such as reconfigurable intelligent surfaces (RISs), metasurfaces, MMICs, beamforming, and massive MIMOs, which significantly affect the overall performance of 5G and 6G front-end transceivers.

Dr. Yasir I. A. Al-Yasir
Dr. Sunday Ekpo
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. Technologies 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 1600 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

  • microwave
  • millimeter-wave
  • 6G
  • 5G

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Published Papers (1 paper)

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26 pages, 2568 KiB  
Article
Unified Framework for RIS-Enhanced Wireless Communication and Ambient RF Energy Harvesting: Performance and Sustainability Analysis
by Sunday Enahoro, Sunday Ekpo, Yasir Al-Yasir, Mfonobong Uko, Fanuel Elias, Rahul Unnikrishnan and Stephen Alabi
Technologies 2025, 13(6), 244; https://doi.org/10.3390/technologies13060244 - 12 Jun 2025
Viewed by 470
Abstract
The increasing demand for high-capacity, energy-efficient wireless networks poses significant challenges in maintaining spectral efficiency, minimizing interference, and ensuring sustainability. Traditional direct-link communication suffers from signal degradation due to path loss, multipath fading, and interference, limiting overall performance. To mitigate these challenges, this [...] Read more.
The increasing demand for high-capacity, energy-efficient wireless networks poses significant challenges in maintaining spectral efficiency, minimizing interference, and ensuring sustainability. Traditional direct-link communication suffers from signal degradation due to path loss, multipath fading, and interference, limiting overall performance. To mitigate these challenges, this paper proposes a unified RIS framework that integrates passive and active Reconfigurable Intelligent Surfaces (RISs) for enhanced communication and ambient RF energy harvesting. Our methodology optimizes RIS-assisted beamforming using successive convex approximation (SCA) and adaptive phase shift tuning, maximizing desired signal reception while reducing interference. Passive RIS efficiently reflects signals without external power, whereas active RIS employs amplification-assisted reflection for superior performance. Evaluations using realistic urban macrocell and mmWave channel models reveal that, compared to direct links, passive RIS boosts SNR from 3.0 dB to 7.1 dB, and throughput from 2.6 Gbps to 4.6 Gbps, while active RIS further enhances the SNR to 10.0 dB and throughput to 6.8 Gbps. Energy efficiency increases from 0.44 to 0.67 (passive) and 0.82 (active), with latency reduced from 80 ms to 35 ms. These performance metrics validate the proposed approach and highlight its potential applications in urban 5G networks, IoT systems, high-mobility scenarios, and other next-generation wireless environments. Full article
(This article belongs to the Special Issue Microwave/Millimeter-Wave Future Trends and Technologies)
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