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Applied Sciences
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RF/Millimeter-Wave/Sub-THz Antennas, Integrated Circuits and Systems for 5G and Beyond
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RF/Millimeter-Wave/Sub-THz Antennas, Integrated Circuits and Systems for 5G and Beyond

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Electrical, Electronics and Communications Engineering".

Deadline for manuscript submissions: 30 April 2026 | Viewed by 1946

Special Issue Editor

Dr. Chul Woo Byeon

E-Mail Website
Guest Editor
School of Electronics and Electrical Engineering, College of Engineering, Dankook University, Yongin-si 16890, Republic of Korea
Interests: CMOS RF/millimeter-wave/THz integrated circuits; antenna and system designs for wireless communications; radar and wireless power transmission

Special Issue Information

Dear Colleagues,

The 5G and 6G wireless communications are extending the area of communication into various systems, such as satellite communications and automotive radar systems. Recently, there has been strong interest in techniques used to extend systems from RF through millimeter-wave to sub-THz. Examples of these include antenna, circuits, and systems for CMOS-, SiGe-, GaAs-, and GaN-based transceivers, phased arrays, reflected impedance surfaces, automotive imaging radars, military/commercial radars and communications, RF wireless power transfer, built-in self-test, and calibration. Advanced systems also include advanced 3D packaging.

In this Special Issue, original research articles and reviews are welcome to be submitted. Research areas may include, but are not limited to, the following:

  1. RF, millimeter-wave, and sub-THz antenna and circuits;
  2. RF, millimeter-wave, and sub-THz front-end circuits, transmitters, receivers, and transceivers;
  3. RF, millimeter-wave, and sub-THz devices, packaging, modeling, and testing technologies;
  4. 5G/6G, satellite, radar, imager, and sensor applications.

I look forward to receiving your contributions.

Sincerely,

Dr. Chul Woo Byeon
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 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. Applied Sciences 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

  • RF
  • millimeter-wave
  • 5G/6G
  • satellite
  • radar

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Published Papers (3 papers)

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Research

28 pages, 6296 KB  
Article
Calculation and Simulation of a Radar Antenna with Reflector and a cosec2·cos Pattern Beam
by Petru Mazăre, Anton Muraru, Camelia Mazăre, Sorin Lazăr, Simona Halunga, Octavian Fratu and Maria Sîrbu-Drăgan
Appl. Sci. 2025, 15(17), 9515; https://doi.org/10.3390/app15179515 - 29 Aug 2025
Viewed by 273
Abstract
This study presents a new approach for generating the symmetrical plan curve of a double-curved antenna reflector’s radiation pattern as an alternative to optimizing it when the primary radiation source has a given pattern. The results obtained are compared with those achieved using [...] Read more.
This study presents a new approach for generating the symmetrical plan curve of a double-curved antenna reflector’s radiation pattern as an alternative to optimizing it when the primary radiation source has a given pattern. The results obtained are compared with those achieved using a source with a different characteristic, clearly indicating the potential to minimize the reflector surface area through illumination with a specific characteristic. Moreover, diffraction calculations for an antenna including a reflector that employs the calculated vertical profile derived from a primary radiation source characterized by a given beam pattern are presented. This analysis considers two cases: one with horizontal polarization and the other with vertical polarization. Simulation results are provided for the diffraction calculation of a reflector with radiation characteristics that employs a sectorial horn antenna with directivity characteristics. In this setup, the angular limits of the reflected beam are sequentially adjusted, allowing the changes in the directivity characteristic to be observed and discussed to determine the optimal configuration for the intended application. Full article
(This article belongs to the Special Issue RF/Millimeter-Wave/Sub-THz Antennas, Integrated Circuits and Systems for 5G and Beyond)
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30 pages, 1166 KB  
Article
A Novel DRL-Transformer Framework for Maximizing the Sum Rate in Reconfigurable Intelligent Surface-Assisted THz Communication Systems
by Pardis Sadatian Moghaddam, Sarvenaz Sadat Khatami, Francisco Hernando-Gallego and Diego Martín
Appl. Sci. 2025, 15(17), 9435; https://doi.org/10.3390/app15179435 - 28 Aug 2025
Viewed by 396
Abstract
Terahertz (THz) communication is a key technology for sixth-generation (6G) networks, offering ultra-high data rates, low latency, and massive connectivity. However, the THz band faces significant propagation challenges, including high path loss, molecular absorption, and susceptibility to blockage. Reconfigurable intelligent surfaces (RISs) have [...] Read more.
Terahertz (THz) communication is a key technology for sixth-generation (6G) networks, offering ultra-high data rates, low latency, and massive connectivity. However, the THz band faces significant propagation challenges, including high path loss, molecular absorption, and susceptibility to blockage. Reconfigurable intelligent surfaces (RISs) have emerged as an effective solution to overcome these limitations by reconfiguring the wireless environment through passive beam steering. In this work, we propose a novel framework, namely the optimized deep reinforcement learning transformer (ODRL-Transformer), to maximize the sum rate in RIS-assisted THz systems. The framework integrates a Transformer encoder for extracting temporal and contextual features from sequential channel observations, a DRL agent for adaptive beamforming and phase shift control, and a hybrid biogeography-based optimization (HBBO) algorithm for tuning the hyperparameters of both modules. This design enables efficient long-term decisionmaking and improved convergence. Extensive simulations of dynamic THz channel models demonstrate that ODRL-Transformer outperforms other optimization baselines in terms of the sum rate, convergence speed, stability, and generalization. The proposed model achieved an error rate of 0.03, strong robustness, and fast convergence, highlighting its potential for intelligent resource allocation in next-generation RIS-assisted THz networks. Full article
(This article belongs to the Special Issue RF/Millimeter-Wave/Sub-THz Antennas, Integrated Circuits and Systems for 5G and Beyond)
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16 pages, 860 KB  
Article
Adaptive Pre-Distortion Compensation for LED Nonlinear Distortion in VLC-OFDM Systems Using Frequency Symbol Spreading
by Koichi Seimiya, Ren Oshima, Geonuk Kang and Chang-Jun Ahn
Appl. Sci. 2025, 15(8), 4221; https://doi.org/10.3390/app15084221 - 11 Apr 2025
Viewed by 731
Abstract
This paper proposes an adaptive pre-distortion method for mitigating LED nonlinear distortion in Visible Light Communication (VLC)-OFDM systems. The inherent nonlinear characteristics of LEDs disrupt the orthogonality among OFDM subcarriers, causing signal distortion and performance degradation. To overcome this issue while minimizing computational [...] Read more.
This paper proposes an adaptive pre-distortion method for mitigating LED nonlinear distortion in Visible Light Communication (VLC)-OFDM systems. The inherent nonlinear characteristics of LEDs disrupt the orthogonality among OFDM subcarriers, causing signal distortion and performance degradation. To overcome this issue while minimizing computational complexity at the transmitter, we introduce a feedback-based nonlinear parameter estimation approach using the Least Squares Method (LSM) and Median Based Method (MBM). These estimated parameters are then fed back to the transmitter, enabling efficient adaptive pre-distortion based on the inverse function of the estimated nonlinear characteristics. This approach reduces computational costs at the transmitter compared to conventional methods requiring high-performance processing. Additionally, we incorporate Frequency Symbol Spreading (FSS) to further enhance robustness against channel impairments such as Rician fading by equalizing the Signal-to-Noise Ratio (SNR) across subcarriers. Simulation results under various channel conditions, including AWGN, Rician fading, and realistic multi-LED lighting scenarios, demonstrate a significant improvement in Bit Error Rate (BER) performance, validating both the effectiveness and practical advantages of the proposed approach. Full article
(This article belongs to the Special Issue RF/Millimeter-Wave/Sub-THz Antennas, Integrated Circuits and Systems for 5G and Beyond)
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