Dual-band MIMO Antenna Research Articles

A twelve element dual-band MIMO antenna for 5G smartphones.

In this paper, a 12x12 dual-band MIMO antenna for 5G smartphones is proposed. It operates in the sub 6 GHz (2.4GHz and 3.5GHz) frequency bands. The MIMO antenna elements are printed on an FR4 epoxy substrate that has a thickness of 0.8mm. The main substrate measures 150 × 75 × 0.8 mm3, while the side substrates have dimensions of 75 × 6 × 0.8mm3. The twelve dual-band antenna elements are compact in size. Each antenna element size is reduced significantly, which is 11.20 × 5.98 mm2(0.0896λ × 0.04784λ). These antenna elments are arranged in such a way that the MIMO antenna not only provides polarization diversity but also helps in achieving good performance in terms of isolation, which is more than 13.5 dB between two adjacent antenna elements. Another significance of the proposed antenna is that both the frequency bands can be tuned independently by varying the corresponding length of each arm. The performance parameters like efficiency is around 40-56% for the lower band and it is 48-62% for the upper band. The envelope correlation coefficient (ECC) is below 0.04 in both frequency bands for the proposed dual band MIMO antenna.

Design and optimization of a deep learning algorithm assisted stub-loaded dual band four-port MIMO antenna for Sub-6 GHz 5G and X band satellite communication applications

In this article, C-type stubs loaded hexagonal shaped four-element MIMO antenna is proposed with improved isolation for sub-6 GHz 5G and X-band satellite wireless communication applications. Initially, the design and simulation studies of the MIMO antenna are performed using Computer Simulation Software (CST) software but its design parameter estimation and optimization consume higher time using conventional EM simulation tools. In order to solve this issue, Deep Learning algorithm-based approach has been proposed to determine the optimal physical parameters along with best possible performance characteristics. This suggested DL based approach is resource and time efficient for parameter estimation and optimization during the design process. To reduce design space and generation of an effective dataset, the feature reduction method (FRM) is implied during the design process. The S-parameters are predicted through Dual-Channel (DC-DNN) Deep Neural Network model. The dual-band MIMO antenna operates with −10 dB impedance Bandwidths of 40 % (2.8 GHz – 4.2 GHz), 38.41 % (6.1 GHz – 9.0 GHz) and shows excellent diversity performance. The proposed MIMO antenna is suitable for Sub-6 GHz n77 (3.3–4.2 GHz), n78 (3.3–3.8 GHz) 5G NR bands and also supports X band satellite (7.25–7.75 GHz and 7.9–8.4 GHz) communication applications.

A Novel High-Isolation Dual-Band Monocone Antenna Array for Wi-Fi 6 Application

This paper presents a novel high isolation monocone antenna array for Wi-Fi 6 applications. Conical radiator, top patch and shorting pins are combined to obtain an ultra-wide operating bandwidth, which covers the full Wi-Fi 6 frequency bands. The decoupling structure consists of two parts: higher-frequency decoupling element (HDE) and lower-frequency decoupling element (LDE). LDE consists of a pair of C-shaped rings, a metal strip and three shorting pins. HDE is composed of two T-shaped metal strips placed vertically on the ground. For further investigation, the equivalent circuit model of the proposed antennas is adopted to explain the decoupling principles. And design formulas are rigorously derived to facilitate the construction of decoupling structures. For verification, a dual-band monocone MIMO antenna with edge-to-edge spacing of 0.1388 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> (evaluated at lower frequency) is prototyped and characterized. The measured results reveal that proposed antenna can offer enhanced port isolation (23dB/40dB), increased antenna efficiency (>80%) and improved pattern diversity.

Low-loss MIMO antenna wireless communication system for 5G cardiac pacemakers

Cardiovascular diseases (CVDs) are one of the leading causes of death globally. The Internet of things (IoT) enabled with industrial, scientific, and medical (ISM) bands (2.45 and 5.8 GHz) facilitates pacemakers to remotely share heart health data to medical professionals. For the first time, communication between a compact dual-band two-port multiple-input-multiple-output (MIMO) antenna (integrated inside the leadless pacemaker) and an outside-body dual-band two-port MIMO antenna in the ISM 2.45 and 5.8 GHz frequency bands is demonstrated in this work. The proposed communication system offers an attractive solution for cardiac pacemakers as it can operate on a 5G IoT platform while also being compatible with existing 4G standards. The experimental verification of the proposed MIMO antenna low-loss communication capability is also presented by comparing it to the existing single–input–single–output communication between the leadless pacemaker and outside body monitoring device.

Compact Dual-Band MIMO Antenna With Shared Decoupling Structure for 5G Mobile Terminals

In this letter, a compact dual-band MIMO antenna, consisting of four antenna pairs, is presented for 5G mobile terminal applications. Each pair includes two tightly-arranged monopoles. By folding the L-shaped monopoles into U-shaped structures, both the 3.5 GHz band and 4.9 GHz band can share the same decoupling inductor. By adding stop-band filter on the monopole, dual-band operation can be provided by a single branch. The size of the dual-band antenna pair is merely 19×4 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . The measured -6 dB bandwidth can cover 3.4-3.6 GHz and 4.8-5.0 GHz, with port isolation higher than 12 dB. The measured radiation efficiency varies from 41% to 59% in the lower band, and varies from 38% to 62% in the upper band.

A High Isolation Dual-band WiFi MIMO Antenna Design

In this paper, a dual-band WiFi MIMO antenna with high isolation is designed. The antenna is F-Type structure, and the resonant points of high frequency and low frequency are mainly controlled by two branches of ‘F’. In order to improve the isolation between antennas, multiple symmetrically distributed slots are introduced on the ground, by adjusting the size and spacing of each group of slots, the effect of 2.4GHz & 5G dual-band decoupling is realized. Through HFSS simulation and optimization, antenna in frequency of 2.4-2.5GHz & 5.2-5.825GHz, S11 meet-10db bandwidth requirements, the isolation between the two ports is higher than 25dB, meet the design requirements.

Isolation enhancement technique in a dual-band THz MIMO antenna with single radiator

Isolation enhancement technique in a dual-band THz MIMO antenna with single radiator

A Novel SRR Metamaterial Inspired CPW-Fed Dual Band MIMO Antenna for Sub-6 GHz 5G Application

A Novel SRR Metamaterial Inspired CPW-Fed Dual Band MIMO Antenna for Sub-6 GHz 5G Application

A design of dual band wearable MIMO antenna using Organza fabric for medical applications

A novel wearable dual-band MIMO antenna featuring good conformal characteristics under bending conditions is presented. The dielectric part of the antenna is built on a flexible substrate using layered lightweight plain weave fabric Organza with a relative permittivity of 1.63 to achieve a low-light and flabby textile. A defected ground structure (DGS) is employed for improving diverse parameters such as narrow bandwidth and resonant adjusting. The DGS part of the antenna is a resonant slot in the ground layer, placed directly under the patches. The electromagnetic energy is transmitted to the radiating slots using a recessed microstrip line feed along with semi co-planar waveguide (CPW) structure with defective ground metal in the bottom layer. It is worthwhile to point out that using the highly flexible Organza fabric with the ability to change the substrate thickness provided acceptable antenna characteristics under the bending condition in different directions. To validate the design, a prototype antenna is fabricated and experimentally investigated. The effect of substrate thickness on antenna performance is investigated by changing the number of Organza layers in both simulation and experiments. A good agreement is attained between the simulation results and the measurement results. The antenna properties such as scattering parameters, radiation patterns, and SAR values are investigated under bending conditions. Results show that the maximum measured gain is 7.8 dB at 2.4 GHz and 7.3 dB at 5 GHz. The simulated specific absorption rate (SAR) values are less than 0.336 W/Kg and 0.468 W/Kg at 2.4 GHz and 5 GHz for 1 g human body tissue, respectively. The SAR values for the bent antenna are less than 0.302 W/Kg and 0.458 W/Kg at 2.4 GHz and 5 GHz for 1 g human body tissue, respectively.

Design of Dual-Band MIMO antenna for 5G applications

MIMO antenna are widely used in many areas for the great reception of signals. In transport industry for the development of automation and for the advancement they required efficient and high gain antenna transceivers. In this paper, single-element dual band antenna is used for 5G Vehicle to Everything (5G-V2X) application but the design will be enhanced to six-element for full coverage, on analysing single element. Three antennas of same structure as specified in this paper are arranged in a single substrate as a shape of triangle of combining all three, and similar structure is made in another substrate such that both are separated by a strip like structure and arranging both substrates that both triangularly arranged substrate forming a hexagonal structure from the top view. These will increase the coverage over 360° surrounds these will increase the gain over 9dB at mm-Wave range.

Dual-band open-loop monopole (2 × 1) printed MIMO antenna for 4G and 5G applications

Abstract This paper presents a compact dual-band open-loop monopole MIMO antenna to serve 4G/5G applications. This antenna consists of two printed monopole antennas with very high isolation. Two enhancement techniques are utilized to improve the isolation between ports. Since each technique can provide high isolation of a single band, a combination of λ/4 slot and T-shape techniques are used to achieve high isolation of −19 dB and −35 dB at 2.4 GHz and 3.5 GHz, respectively. The proposed design has high efficiency, a low envelope correlation coefficient, and an acceptable level of realized gain (2.7 dBi and 2.2 dBi) at low and high bands. This design has been fabricated using low-profile printed circuit technology with a compact patch size of 50 × 25 mm2 based on an FR-4 substrate. Moreover, the simulation and measurement results are in good agreement.

Dual and wideband 6-port MIMO antenna for WiFi, LTE and carrier aggregation systems applications

This article describes a novel dual-band 6-port MIMO antenna for WiFi, LTE, and carrier aggregation system applications. The proposed antenna consists of a defected annular ring, slots, an array structure, a neutralization block, and a novel isolation structure (GP-3) for enhancement of bandwidth, coupling, isolation, gain, and efficiency. After systematic investigation of the reference antenna (A-0; 0.65λ0×0.48λ0mm2) at the design frequency of 2.4 GHz, an optimized antenna (A-4) with ground plane GP-3 is selected among the antennas (A-1 to A-4). The proposed antenna resonates in dual-band, with a lower band (1.6–2.45 GHz (simulated), 1.57–2.39 GHz (measured)) due to ports P5 and P6, and a higher band (2.3–2.6 GHz (simulated), 2.3–2.58 GHz (measured)) due to ports P1, P2, P3 and P4. A peak realized gain of 2.2 dB and 3.34 dB at resonance frequencies of 1.7 GHz and 2.45 GHz is obtained, respectively. The proposed antenna exhibits a maximum isolation and total efficiency of 45.6 dB and 88%, respectively. Simulated results by means of HFSS version 18 are validated with experimental results of the proposed work.

Low-profile closely coupled dual-band MIMO antenna using double layer metasurface

AbstractA two-element low-profile closely coupled dual-band MIMO antenna is demonstrated for WiMAX applications. Based on the principle of metasurface (MTS) decoupling, a double-layer MTS consisting of pairs of elliptic patches with two different sizes is proposed. The MTS is loaded above a coupled dual-band MIMO antenna, and the mutual coupling in the lower and upper band is reduced by the larger and smaller elliptic patches, respectively. The edge-to-edge distance of antenna elements is only 0.01λ0 (λ0 is the free-space wavelength at 2.6 GHz). The measured results show that the working bandwidths of the MIMO antenna are 2.5–2.69 and 3.4–3.69 GHz. The −10 dB impedance bandwidths in two bands are 8.83% (2.49–2.72 GHz) and 8.50% (3.38–3.68 GHz), and the isolation between antenna elements is enhanced by 13.5 and 18.4 dB in two bands, respectively. Moreover, broadside radiation performances in two bands are obtained.

Design and Analysis of Dual Narrow Band MIMO (DNB-MIMO) Antenna for IoT Applications

A compact DNB-MIMO antenna design and analysis for IoT application was proposed. The antennaradiator consists of 2 L-shaaped quarter-wavelengths and inverted 7-shaped radiators with a microstrip feed line, and partial ground plane with a size of 32 × 15 mm2. This antenna achieves a higher quality factor (Q &gt; 10) and narrow band impedance matching at the central frequencies of 1.8 GHz and 2.4 GHz bands with approximately 8.2% and 6.2% bandwidth respectively. The suitability of the designed antenna for IoT applications is verified through the hosting device model. The proposed 4-port MIMO antenna has an overall size of 60 × 60 ×1.6 mm3, and it is printed on an FR4 substrate. The diversity add comma such as ECC, DG, TARC, MEG, and CCL, are calculated and there values are &lt; 0.19, 9.85 dB, &lt; -25 dB, &lt; -6 dB, &lt; 0.19 bits/Hz/s, respectively, within the limits. The proposed antenna is integrated with the Zigbee module (lowercase) to analyze the performance for IoT applications at 2.4 GHz

Dual Band MIMO Antenna with High Isolation for GSM and WLAN Applications

Dual Band MIMO Antenna with High Isolation for GSM and WLAN Applications

A Gain Enhanced Dual-band Low SAR AMC-based MIMO Antenna for WBAN and WLAN Applications

A Gain Enhanced Dual-band Low SAR AMC-based MIMO Antenna for WBAN and WLAN Applications

Dual-Band Two-Port MIMO Antenna for Biomedical Deep Tissue Communication: Design, Characterization, and Performance Analysis

Dual-Band Two-Port MIMO Antenna for Biomedical Deep Tissue Communication: Design, Characterization, and Performance Analysis

Dual band MIMO antenna for LTE, 4G and sub-6 GHz 5G applications

In this manuscript, a compact MIMO antenna for wireless application has been presented. The proposed antenna consists of the F-shaped radiator with the circular slot in the center and a rectangular ground plane on the other side of the substrate. The proposed antenna has the overall size of 48 ? 48 mm2. The antenna is designed to work on two frequency bands - from 1.5 to 2.3 GHz, and 3.7 to 4.2 GHz, having the resonating frequency of 1.8 GHz and 3.9 GHz respectively. The diversity performance of the antenna is also observed by using a variety of parameters like envelop correlation coefficient (ECC), Diversity Gain (DG), Total Active Reflection Coefficient (TARC), etc. The value of ECC is 0.02, which shows good diversity performance of the antenna. In order to validate the simulated and measured results, the proposed antenna has been fabricated and shows good agreement with the each other.

A Freely Extendable Closely Packed Dual-band MIMO Antenna for 5G Wireless Communication

A Freely Extendable Closely Packed Dual-band MIMO Antenna for 5G Wireless Communication

Four-Port Orthogonal Circularly Polarized Dual-Band MIMO Antenna With Polarization and Spatial Diversity Using a Dual-Band Linear-to-Circular Polarization Converter

A dual-band circularly polarized (CP) four-port multiple-input-multiple-output (MIMO) antenna for K/Ka-bands fixed-satellite service is proposed in this communication. The single element of MIMO is composed of a cascade of two dipoles of different lengths resonating at around 20 and 30 GHz. An array of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$7 \times 7$ </tex-math></inline-formula> elements of the unit cell of the dual-band linear-to-circular polarization converter is placed at a distance of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda _{o}$ </tex-math></inline-formula> /4 ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda _{o}$ </tex-math></inline-formula> is calculated with respect to 19.51 GHz) in the endfire direction of MIMO antenna to obtain an orthogonal CP wave at the two frequency bands. The proposed CP antenna shows good MIMO performance with a correlation coefficient (CC) of less than 0.19 and diversity gain (DG) of better than 0.99 at both the frequency bands. The proposed MIMO also agrees with polarization and spatial diversity, and the CP nature at lower and upper frequency bands can be interchanged by exciting the orthogonal ports. A prototype of the MIMO antenna is fabricated, and the measured CP bandwidths of 11.51% and 3.69% are obtained in the lower (19.65–22.05 GHz) and upper (29.25–30.35 GHz) frequency bands, respectively. The proposed antenna can be used for the Ka-band: 29.5–30.0 and 19.7–20.2 GHz fixed satellite service as uplink and downlink frequencies, respectively.