RF/Microwave Circuits for 5G and Beyond, Volume II

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Microwave and Wireless Communications".

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 2446

Special Issue Editors


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Guest Editor
Biomedical and Electronics Engineering, Faculty of Engineering and Informatics, University of Bradford, Bradford BD7 1DP, UK
Interests: reconfigurable antennas; microwave filters; tunable filters; linear and nonlinear circuits; MIMO/diversity antennas; differentially fed structures; balanced antennas; 5G/6G antennas; RFID antennas; power amplifiers; applied electromagnetics; RF/microwave sensors
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Faculty of Engineering and Informatics, University of Bradford, Bradford BD7 1DP, UK
Interests: energy-efficient front-end design; radio frequency; energy harvesting; communications systems; 5G communications; sensor design; localisation-based services; signal processing; optimisation process; MIMO system design; health hazards; propagations, antennas and electromagnetic computational techniques
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The progress from fourth-generation (4G) networks to fifth-generation (5G) technology has transformed industry and society by enabling an unprecedented level of innovation on the radiofrequency (RF), microwave, and millimeter wave (mmWave) components. 5G is widely seen as the generation of wireless communications that will enable RF/microwave applications to expand into a completely new set of use, case, and vertical markets. Given that 5G is still in its initial stages commercially, much work still needs to be done on channel modeling, radio link performance, and, finally, chipset development before the first realistic applications can be deployed. As the commercial deployment of the 5G technology is well underway in many countries of the world, academic as well as industrial research groups have turned their consideration to what comes next. Thus, one might reasonably expect a “6G” release to arrive at some point in the future.

It is clear that future front and systems must be multi-standard radio, supported by identical RF transceivers within the infrastructures and on the user terminal, and they must also take advantage of new technology models, such as reconfigurability and software‐defined radio (SDR). RF/microwave circuits and their applications, such as antennas, filters, power amplifiers, phase shifters, power dividers, mixers, multiplexers, ceramics, and integrated systems, represent essential elements in such devices, which significantly affect the whole performance of the 5G/6G front end transceivers.

This Special Issue invites academic and industrial scholars and researchers to contribute original research articles, as well as review articles that seek to address the issues, trends, and challenges of design and application of RF/microwave components for 5G and beyond systems to support multi-standard radio flexibility both at the base station and at the user terminal, whilst being energy-efficient in an energy‐conscious world.

Dr. Yasir Al-Yasir
Prof. Dr. Raed A. Abd-Alhameed
Guest Editors

Manuscript Submission Information

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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 transceivers
  • antennas and propagation
  • microwave filters
  • power amplifiers
  • multiplexers
  • power dividers
  • MIMO systems
  • phased array and beamforming
  • metamaterial
  • 5G/6G

Published Papers (2 papers)

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Research

16 pages, 6177 KiB  
Article
Design and Analysis of a Quad-Band Antenna for IoT and Wearable RFID Applications
by Waqas Ali, N. Nizam-Uddin, Wazie M. Abdulkawi, Asad Masood, Ali Hassan, Jamal Abdul Nasir and Munezza Ata Khan
Electronics 2024, 13(4), 700; https://doi.org/10.3390/electronics13040700 - 08 Feb 2024
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Abstract
The role of antennas in wireless communication is critical for enabling efficient signal transmission and reception across various frequency bands, including those associated with IoT (Internet of Things), X-band, S-band, and RFID (radio-frequency identification) systems. This paper presents a small quadruple-band antenna with [...] Read more.
The role of antennas in wireless communication is critical for enabling efficient signal transmission and reception across various frequency bands, including those associated with IoT (Internet of Things), X-band, S-band, and RFID (radio-frequency identification) systems. This paper presents a small quadruple-band antenna with 25 × 40 × 1.5 mm3 dimensions designed for diverse wireless applications. It is adept at operating in the S-band (2.2 GHz), wireless local area network (WLAN) (5.7 GHz), microwave RFID frequency band (5.8 GHz), and X-band (7.7 GHz and 8.3 GHz). While the majority of existing research focuses on antennas covering two or three bands, our work stands out by achieving quad-band operation in the proposed antenna design. This antenna is constructed on a semiflexible Rogers RT5880 substrate, making it well-suited for wearable applications. Computer Simulation Technology (CST) Microwave studio (2019) simulation package software is chosen for design and analysis. The antenna design features a comb-shaped radiating structure, where each “tooth” is responsible for resonating at a distinct frequency with an appropriate bandwidth. The antenna retains stability in both free space and on-body wearability scenarios. It achieves a low specific absorption rate (SAR), meeting wearable criteria with SAR values below 1.6 W/Kg for all resonating frequencies. The proposed antenna demonstrates suitable radiation efficiency, reaching a maximum of 82.6% and a peak gain of 6.3 dBi. It exhibits a bidirectional pattern in the elevation plane and omnidirectional behavior in the azimuth plane. The antenna finds applications across multiple frequencies and shows close agreement between simulated and measured results, validating its effectiveness. Full article
(This article belongs to the Special Issue RF/Microwave Circuits for 5G and Beyond, Volume II)
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16 pages, 7425 KiB  
Article
A Broadband Analog Predistortion Linearizer Based on GaAs MMIC for Ka-Band TWTAs
by Ting Liu, Xiaobao Su, Gang Wang, Bin Zhao, Rui Fu and Dan Zhu
Electronics 2023, 12(6), 1503; https://doi.org/10.3390/electronics12061503 - 22 Mar 2023
Viewed by 1393
Abstract
In this article, a Ka-band broadband analog predistortion (APD) microwave monolithic integrated circuit (MMIC) with independent tunability based on a 0.15 μm GaAs pHEMT process is proposed, which can be cascaded in front of traveling wave tube amplifiers (TWTAs) to improve their linearity. [...] Read more.
In this article, a Ka-band broadband analog predistortion (APD) microwave monolithic integrated circuit (MMIC) with independent tunability based on a 0.15 μm GaAs pHEMT process is proposed, which can be cascaded in front of traveling wave tube amplifiers (TWTAs) to improve their linearity. The influence of different diode sizes on the parameters of Schottky diodes is analyzed and used to design the gain and phase nonlinear branches. The broadband APD MMIC is realized based on a dual-branch vector synthesis design and nonlinear frequency adjust module (NFAM). The independent tunability and broadband characteristics of the APD MMIC are verified by simulated and measured results with an error of less than 5%. Furthermore, a Ka-band 60 W TWTA is linearized by the APD MMIC, and the gain and phase compressions are reduced from 8 dB and 50° to within 3 dB and 12°, respectively. The third-order intermodulation (C/IM3) is greater than 28 dBc and noise power ratio (NPR) is greater than 15.7 dBc at 3 dB output power backoff (OPBO) over the operating band of 25.1~27.5 GHz, indicating that the APD MMIC can improve the nonlinearity of TWTA effectively under broadband signals. Full article
(This article belongs to the Special Issue RF/Microwave Circuits for 5G and Beyond, Volume II)
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