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: 30 April 2024 | Viewed by 3199

Special Issue Editors

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
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
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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

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Keywords

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

Published Papers (2 papers)

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Research

15 pages, 10849 KiB  
Article
Wideband Millimeter-Wave MIMO Antenna with a Loaded Dielectric Cover for High-Gain Broadside Radiation
Electronics 2023, 12(21), 4384; https://doi.org/10.3390/electronics12214384 - 24 Oct 2023
Cited by 2 | Viewed by 668
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
Electronics 2023, 12(7), 1733; https://doi.org/10.3390/electronics12071733 - 05 Apr 2023
Cited by 3 | Viewed by 1546
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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