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Telecom
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Advances in Microwave, Antenna, and Radio Frequency Technology and Its...
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Advances in Microwave, Antenna, and Radio Frequency Technology and Its Applications

A special issue of Telecom (ISSN 2673-4001).

Deadline for manuscript submissions: 30 November 2026 | Viewed by 1261

Editor

Dr. Valdemir Praxedes Da Silva Neto

E-Mail Website
Guest Editor
Department of Communication Engineering, Federal University of Rio Grande Do Norte, Natal 59078-900, Brazil
Interests: microwave sensors; planar antennas and implantable microwave devices; WPT in the microwave range; planar antennas and devices; frequency selective surfaces; antennas for millimeter waves; MIMO and smart antennas; antennas for satellite communications

Special Issue Information

Dear Colleagues,

Recent advances in microwave technologies, antenna systems, and electromagnetic wave propagation are key enablers of modern and next-generation telecommunication systems. This Special Issue of Telecom aims to provide a platform for the dissemination of high-quality research addressing the technology behind and application of microwaves, antennas and propagation, with an emphasis on both theoretical developments and practical implementations.

The scope of this Special Issue includes, but is not limited to, microwave and millimeter-wave devices and circuits, compact, broadband, and reconfigurable antennas, propagation and channel modeling, electromagnetic compatibility, and measurement techniques in complex environments. Contributions focusing on emerging applications such as 5G/6G wireless communications, Internet of Things (IoT), vehicular and satellite communications, radar and sensing systems, remote sensing, and biomedical applications are particularly encouraged for submission.

We invite original research articles and comprehensive review papers that integrate electromagnetic theory, numerical modeling, simulation, optimization, prototyping, and experimental validation. This Special Issue seeks to foster collaboration between academia and industry and to highlight innovative solutions that advance the state of the art in microwave, antenna, and propagation technologies for telecommunications.

Dr. Valdemir Praxedes Da Silva Neto
Guest Editor

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 250 words) can be sent to the Editorial Office for assessment.

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-anonymized peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Telecom 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 1400 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

  • 5G/6G wireless communications
  • Internet of Things (IoT)
  • vehicular and satellite communications
  • radar and sensing systems
  • remote sensing

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  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
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  • External promotion: Articles in Special Issues are often promoted through the journal's social media, increasing their visibility.
  • Reprint: MDPI Books provides the opportunity to republish successful Special Issues in book format, both online and in print.

Further information on MDPI's Special Issue policies can be found here.

Published Papers (3 papers)

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Research

21 pages, 2853 KB  
Article
Optimal Control-Based Beamforming for Phased Antenna Arrays in 5G and Radar Applications
by Moubarek Traii, Zied Harouni, Mohamed Glaoui, Said Ghnimi and Ali Gharsallah
Telecom 2026, 7(4), 88; https://doi.org/10.3390/telecom7040088 - 4 Jul 2026
Viewed by 201
Abstract
This paper presents a novel optimal control-based beamforming framework for phased antenna arrays, targeting advanced wireless communication and radar applications, including 5G systems. Unlike conventional beamforming techniques, such as Fourier-based methods and adaptive algorithms (e.g., LMS and RLS), the proposed approach formulates the [...] Read more.
This paper presents a novel optimal control-based beamforming framework for phased antenna arrays, targeting advanced wireless communication and radar applications, including 5G systems. Unlike conventional beamforming techniques, such as Fourier-based methods and adaptive algorithms (e.g., LMS and RLS), the proposed approach formulates the beam synthesis problem as a discrete-time optimal control problem. The antenna array is modeled using a state-space representation, and a quadratic cost function is introduced to jointly minimize the deviation from a desired radiation pattern and the excitation power. The optimal excitation weights are derived using the Linear Quadratic Regulator (LQR) framework by solving the discrete-time algebraic Riccati equation. This formulation enables an effective trade-off between sidelobe suppression, main lobe accuracy, and power efficiency. Simulation results demonstrate that the proposed method achieves a well-focused main beam, significantly reduced sidelobe levels, and improved directivity compared to conventional approaches. Furthermore, the framework offers robustness and computational efficiency, making it a promising candidate for future FPGA and embedded implementations. Overall, the proposed optimal control-based beamforming approach provides a flexible, robust, and computationally efficient solution for next-generation antenna systems in 5G, beyond-5G (B5G), and radar applications. Full article
(This article belongs to the Special Issue Advances in Microwave, Antenna, and Radio Frequency Technology and Its Applications)
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23 pages, 4189 KB  
Article
A Fixed Air-Core Beam Wireless Power Transfer for Drones: Theory, Design, and Experimental Insights
by Takayuki Matsumuro, Satoru Shimizu, Susumu Ano and Takashi Tomura
Telecom 2026, 7(4), 79; https://doi.org/10.3390/telecom7040079 - 1 Jul 2026
Viewed by 268
Abstract
Air-core (donut-shaped) microwave beams are attractive for wireless power transfer (WPT) for drones because their central intensity null can reduce field concentration near mission equipment mounted near the drone center. This paper proposes a fixed air-core beam WPT architecture in which the transmitting [...] Read more.
Air-core (donut-shaped) microwave beams are attractive for wireless power transfer (WPT) for drones because their central intensity null can reduce field concentration near mission equipment mounted near the drone center. This paper proposes a fixed air-core beam WPT architecture in which the transmitting beam is not electronically steered; instead, the drone maintains its position near an efficient receiving region using onboard control based on relative beam-position information inferred from received signals. To support this architecture, we present a theoretical analysis of captured power and spillover for a circular receiving aperture illuminated by a Laguerre–Gaussian (LG) beam. Rather than claiming a direct extension of the modified Friis formula to LG beams, we derive a closed-form expression corresponding to the edge-based efficiency/spillover interpretation used in Gaussian-beam WPT discussions. We then report staged experimental validation using a 24 GHz radial line slot antenna (RLSA)-based air-core beam transmitter with a 25 W class feed circuit, a horn-antenna-based reference receiver for principal validation, and a panel rectenna prototype for implementation-oriented evaluation. The results clarify practical operating conditions and implementation limitations, including distance-dependent position-detection behavior and compact-receiver sensitivity degradation under air-core beam illumination. Full article
(This article belongs to the Special Issue Advances in Microwave, Antenna, and Radio Frequency Technology and Its Applications)
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13 pages, 5893 KB  
Article
A Graded Partial Dielectric Transformer for Bandwidth Enhancement in an Ultrawideband High-Power Combined TEM Antenna
by Alexander D. Dowell, Mohamed Z. M. Hamdalla and Kalyan C. Durbhakula
Telecom 2026, 7(3), 54; https://doi.org/10.3390/telecom7030054 - 11 May 2026
Viewed by 355
Abstract
Designing an ultrashort, fast-rising high-power microwave (HPM) system requires an antenna that simultaneously provides ultrawideband (UWB) operation, high gain, and megawatt-level power handling under strict size, weight, and power (SWaP) constraints. To meet these requirements, this paper proposes an improved UWB HPM antenna [...] Read more.
Designing an ultrashort, fast-rising high-power microwave (HPM) system requires an antenna that simultaneously provides ultrawideband (UWB) operation, high gain, and megawatt-level power handling under strict size, weight, and power (SWaP) constraints. To meet these requirements, this paper proposes an improved UWB HPM antenna that integrates a graded partial dielectric transformer (PDT) with a Koshelev-type combined antenna. The graded PDT improves impedance matching and field continuity by smoothing the dielectric-to-free-space transition, thereby alleviating a key bandwidth limitation of conventional combined antennas. Through iterative simulation, low-cost fabrication, and experimental validation, the proposed design achieves a 2.8x bandwidth enhancement, increasing the measured fractional bandwidth from 53% to 148%, with S11 < −10 dB from 0.5 to 3.0 GHz and with an additional −10 dB operating band from 3.5 to 4.4 GHz. Simulations predict a peak gain value of 15 dBi at 2.1 GHz. High-voltage pulsed tests (9–10 kV, 500 ps rise time) confirm robust operation, with radiated electric fields exceeding 10 kV/m at 1 m and no observable breakdown. The lightweight 3D-printed PLA structure (197 g) provides a scalable solution for directed-energy and electromagnetic-pulse applications. Full article
(This article belongs to the Special Issue Advances in Microwave, Antenna, and Radio Frequency Technology and Its Applications)
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