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Electronics
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State-of-the-Art of Smart MIMO Antennas
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State-of-the-Art of Smart MIMO Antennas

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

Deadline for manuscript submissions: closed (30 April 2024) | Viewed by 5142

Special Issue Editors

Dr. Merih Palandoken

E-Mail Website
Guest Editor
Electrical and Electronics Engineering Department, Izmir Katip Celebi University, Izmir, Turkey
Interests: analytical/numerical design and modeling of active/passive wireless components in the micro/millimeter wave frequencies especially in the field of RF energy harvesting systems; machine learning based smart RF components and IoT compatible microwave sensors
Prof. Dr. Francisco Falcone

E-Mail Website
Guest Editor
1. Department of Electrical, Electronic and Communication Engineering & Institute for Smart Cities (ISC), Public University of Navarre, 31006 Pamplona, Spain
2. School of Engineering and Science, Tecnologico de Monterrey, Monterrey 64849, Mexico
Interests: wireless networks; performance evaluation; distributed systems; context-aware environments; IoT; next-generation wireless systems
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

After the technological implementation  of the first version of the fifth-generation (5G) new radio (NR) standard through massive multiple-input multiple-output (MIMO) systems, there are still many challenges remaining to overcome in 6G and beyond with the target performance improvements in terms of  higher data rates, lower latencies, better energy efficiency, and improved robustness. Multiple antenna technologies are, therefore, important key components to addressing the technical challenges in almost all recent wireless generations. Alternative to the conventional phased antenna arrays employed for diversity enhancement to improve the sensitivity to one signal, MIMO systems are composed of antenna arrays jointly at both transmiting and receiving sides in a communication link to spatially multiplex signals over multipath or near-field channels.

MIMO systems are continuously evolving with the novel antenna design strategies as a research topic in addition to the enhanced massive MIMO techniques and array architectures with high potential solution for the system requirements in 6G and beyond. This Special Issue aims to highlight recent research on multiple antenna technologies.

Potential research topics include, but are not limited to:

  • MIMO channel modeling theory;
  • Artifical material based compact MIMO antenna design;
  • Multi-band/wideband MIMO antenna design;
  • Machine learning assisted MIMO antenna design;
  • Smart reconfigurable MIMO antennas;
  • Implantable/Wearable MIMO antennas;
  • Optimum MIMO antenna selection;
  • Antenna mutual coupling improvement techniques;
  • Lens antenna array and intelligent reflecting surface design for mmwave massive MIMO systems.

Dr. Merih Palandoken
Prof. Dr. Francisco Falcone
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

  • metamaterials based MIMO antennas
  • reconfigurable MIMO antennas
  • smart MIMO antennas
  • MIMO channel modelling
  • massive MIMO
  • surrogate modelling of MIMO antennas
  • implantable MIMO antennas

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Published Papers (3 papers)

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Research

10 pages, 25972 KiB  
Article
Circularly Polarized 4 × 4 Array Antenna with a Wide Axial Ratio Bandwidth
by Tae-Hak Lee, Jinwoo Jung and Seongmin Pyo
Electronics 2024, 13(11), 2076; https://doi.org/10.3390/electronics13112076 - 27 May 2024
Viewed by 621
Abstract
In this manuscript, we propose a circularly polarized (CP) antenna design that can achieve broadband axial ratio (AR) bandwidth in the X-band. A sequentially rotated serial feeding network is applied to achieve the broadband requirement. The proposed antenna consists of two substrates, one [...] Read more.
In this manuscript, we propose a circularly polarized (CP) antenna design that can achieve broadband axial ratio (AR) bandwidth in the X-band. A sequentially rotated serial feeding network is applied to achieve the broadband requirement. The proposed antenna consists of two substrates, one is for feeding elements and the other is for radiating elements. The 16 radiating elements located on an upper substrate are fed through cross-shaped slots located in a ground plane between two substrates. The feed network is based on a 1:4 power divider design and consists of a serial connection of the power dividers resulting in the proper power splitting to the 16 radiating elements. The proposed antenna is designed to exhibit an optimal radiation characteristic of around 8.2 GHz with a CP antenna gain greater than 16 dB and similarly wide impedance and AR bandwidths. Experiments with the fabricated CP antenna were performed to support the proposed CP antenna design theory and are in good agreement with the simulation results. Full article
(This article belongs to the Special Issue State-of-the-Art of Smart MIMO Antennas)
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15 pages, 10849 KiB  
Article
Wideband Millimeter-Wave MIMO Antenna with a Loaded Dielectric Cover for High-Gain Broadside Radiation
by Zhijiao Chen, Wei Song and Wensong Wang
Electronics 2023, 12(21), 4384; https://doi.org/10.3390/electronics12214384 - 24 Oct 2023
Cited by 2 | Viewed by 1056
Abstract
In a millimeter-wave terminal device, the use of a radome degrades the radiating performance of the broadside antenna, especially for the MIMO antenna system. In this study, a dielectric cover is de-signed and investigated to enhance the broadside gain of a millimeter-wave MIMO [...] Read more.
In a millimeter-wave terminal device, the use of a radome degrades the radiating performance of the broadside antenna, especially for the MIMO antenna system. In this study, a dielectric cover is de-signed and investigated to enhance the broadside gain of a millimeter-wave MIMO antenna, while keeping its wideband and high isolation performance. Firstly, a compact wideband ladder-shaped slot antenna is proposed with 21.9% bandwidth. The effectiveness of the dielectric cover design criteria over the wideband antenna is investigated. Then, this wideband antenna element is expanded to a 2 × 2 MIMO antenna by forming a center-symmetric structure and isolating it via the inserted metal vias. By loading the dielectric cover, this millimeter-wave MIMO antenna is verified with enhanced broadside gain for more than 2.1 dB. With the measured impedance bandwidth of 21.9% (57.0–71.0 GHz), peak broadside gain of 12.3 dBi, and high isolation over 15 dB, the proposed MIMO antenna is suitable for wireless gigabit terminal devices. Full article
(This article belongs to the Special Issue State-of-the-Art of Smart MIMO Antennas)
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15 pages, 3466 KiB  
Article
A New Generation of Fast and Low-Memory Smart Digital/Geometrical Beamforming MIMO Antenna
by Kandasamy Pirapaharan, W. H. Sasinda C. Prabhashana, S. P. Pramuka Medaranga, Paul R. P. Hoole and Xavier Fernando
Electronics 2023, 12(7), 1733; https://doi.org/10.3390/electronics12071733 - 5 Apr 2023
Cited by 6 | Viewed by 2114
Abstract
Smart multiple-input multiple-output (MIMO) antennas with advanced signal processing algorithms are necessary in future wireless networks, such as 6G and beyond, for accurate space division multiplexing and beamforming. Such a MIMO antenna will yield better network coverage and tracking. This paper presents a [...] Read more.
Smart multiple-input multiple-output (MIMO) antennas with advanced signal processing algorithms are necessary in future wireless networks, such as 6G and beyond, for accurate space division multiplexing and beamforming. Such a MIMO antenna will yield better network coverage and tracking. This paper presents a smart MIMO antenna configuration with a highly innovative beamforming technique using several nonlinear configurations of dipole arrays. Phase delay factors are optimized at the transmitter to form a single beam and then to steer the beam towards a particular direction. A number of phase shifters are added in order to obtain maximum directional gain. This configuration also significantly increases the power gain of the MIMO antenna at a low cost and with operational simplicity. The paper also demonstrates how the beam width and beamsteering can be effectively controlled. Wolfram Mathematica software was used to generate the three-dimensional radiated beam patterns of the transmitter antenna. There are two approaches to configure the receiver antenna. In the first approach, the received signal magnitude is maximized by aligning the contribution of all elements of the receiver antenna to the same phase. With this approach, the field gain of the proposed system is 25.52 (14.07 dBi). The signal processing gain at the receiver is 64 (18.06 dBi). Therefore, the overall power gain for this proposed new digital/geometrical smart MIMO system is 32.13 dBi. In the second approach, the receiver beam is directed towards the transmitter by optimizing the phase delay coefficients of the receiver. Here, the overall gain of the system is found to be 134.56 (21.28 dBi). Even though the system gain in the second approach is lower, it has the advantage of low interference at the receiver side. Full article
(This article belongs to the Special Issue State-of-the-Art of Smart MIMO Antennas)
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