scholarly journals Design Issues and Challenges in Indoor MIMO Antenna Systems

2020 ◽  
Vol 8 (6) ◽  
pp. 3842-3846
Keyword(s):  
High Speed ◽  
Mimo Systems ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Research Work ◽  
Antenna System ◽  
Design Parameters ◽  
Future Research ◽  
Design Issues ◽  
Mimo Antenna

The promising solution for next generation wireless communication system is multiple input multiple output (MIMO) system. It can transmit and receive data from different channels simultaneously without any need of additional frequency band. In this paper the design issues and challenges in MIMO antenna system for different applications have been reviewed. The major applications of MIMO systems include Wi-Fi, High Speed Packet Access, LTE, WiMAX (4G), and also MIMO has been used in power line communication. Implementation of MIMO antenna system is dependent on important parameters such as: Peak gain, Average Gain, Mutual Coupling, Envelop Correlation Coefficient (ECC), Total Active Reflection Coefficient (TARC), Signal polarization and Miniaturization of antenna system. Hence an optimal MIMO antenna design to suit for communication applications in an indoor environment is a challenging task. This paper proposes comparative study for the different MIMO antenna parameters. The different modeling techniques for MIMO antenna system are surveyed and areas for future research work in line with tradeoffs between different design parameters are suggested.

Design of a compact MIMO antenna system with reduced mutual coupling

2014 ◽  
Vol 8 (1) ◽  
pp. 117-124 ◽  
Author(s):  
Mohammed Younus Talha ◽  
Kamili Jagadeesh Babu ◽  
Rabah W. Aldhaheri
Keyword(s):  
Resonant Frequency ◽  
Mutual Coupling ◽  
Mimo System ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Antenna System ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Mimo Antenna ◽  
Operating Band

A novel compact multiple-input–multiple-output (MIMO) antenna system operating from 5 to 7.3 GHz is proposed for wireless applications. It comprises of two similar antennas with microstrip feeding and radiating patches developed on a reduced ground plane. The developed antenna system resonates at a dual-band of 5.4 and 6.8 GHz frequencies, giving an impedance bandwidth of 38% (based on S11 < −10 dB). The unique structure of the proposed MIMO system gives a reduced mutual coupling of −27 dB at 5.4 GHz resonant frequency and −19 dB at 6.8 GHz resonant frequency and in the entire operating band the coupling is maintained well below −16 dB. The envelope correlation coefficient of the proposed MIMO system is calculated and is found to be less than 0.05 in the operating band. The measured and simulation results are found in good agreement.

Cross Polarized 2x2 LTE MIMO System for Automotive Shark Fin Application

2020 ◽  
Vol 35 (10) ◽  
pp. 1207-1216
Author(s):  
Djordje Preradov ◽  
Daniel Aloi
Keyword(s):  
Mimo System ◽  
Antenna System ◽  
Small Distance ◽  
Design Parameters ◽  
Cross Polarization ◽  
Physical Constraints ◽  
Mimo Antenna ◽  
Planar Monopole Antenna ◽  
Fin Design ◽  
Better Than

In this research we propose two orthogonally placed FR4 printed planar monopole antenna elements for use in the automobile roof top shark fin antenna for LTE MIMO applications. The discussed MIMO antenna system is designed to cover the worldwide LTE frequency band from 698MHz to 2700MHz. The goal of this research is to achieve satisfactory MIMO performance across the whole band while staying within physical constraints of the shark fin style antenna. The target reflection coefficient (S11) of each element is -6dB. Because of physical constraints of the automotive shark fin design antenna MIMO decorrelation is achieved by cross polarization and small distance separation. Correlation better than -12dB is targeted and achieved in higher bands, while in lower frequency bands antennas would not benefit from MIMO performance. Numerical simulation of the MIMO antenna system is performed using FEKO in order to verify the design parameters. Simulation findings are confirmed by manufacturing antennas and testing in the lab.

Investigation of 10-port coupled fed slotted MIMO antenna system for 5G mobile handset

2021 ◽  
pp. 1-14
Author(s):  
D. Rajesh Kumar ◽  
G. Venkat Babu ◽  
K.G. Sujanth Narayan ◽  
N. Raju
Keyword(s):  
Antenna Array ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Antenna System ◽  
Circuit Board ◽  
Dual Band ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Mimo Antenna ◽  
Diversity Techniques

Abstract A dual-band 10-port multiple input multiple output (MIMO) antenna array for 5G smartphone is proposed. Each antenna in the MIMO system can work from 3.4 to 3.6 GHz and 5 to 6 GHz with 10 dB (2:1 VSWR) impedance bandwidth. Nevertheless, for a 3:1 VSWR, the antenna operates from 3.3 to 3.8 GHz and 4.67 to 6.24 GHz. The MIMO system is formed by making 10 seven-shaped coupled fed slot antenna elements excited at two different resonant modes and integrated into the system circuit board. By implementing the spatial and polarization diversity techniques, high isolation better than 28 dB between any pair of antenna elements is achieved. The proposed 10-port MIMO antenna array is fabricated and measured. Significant radiation efficiency is obtained, ranging from 65 to 82% for both bands. The antenna gain in the required operating band is substantial, around 3–3.8 dBi. Further, the MIMO parameters such as envelope correlation co-efficient, channel capacity, and total active reflection co-efficient are calculated. The antenna's robustness is estimated by analyzing the user hand effects and specific absorption rate (SAR). The measured results are well agreed with the simulated results.

scholarly journals Mutual Coupling Reduction of E-Shaped MIMO Antenna with Matrix of C-Shaped Resonators

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Raghad Ghalib Saadallah Alsultan ◽  
Gölge Ögücü Yetkin
Keyword(s):  
Mutual Coupling ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Surface Current ◽  
Antenna System ◽  
Total Efficiency ◽  
Mimo Antenna ◽  
Multiple Input ◽  
Parallel Arrangement ◽  
Input Multiple Output

E-shaped multiple-input-multiple-output (MIMO) microstrip antenna systems operating in WLAN and WiMAX bands (between 5 and 7.5 GHz) are proposed with enhanced isolation features. The systems are comprised of two antennas that are placed parallel and orthogonal to each other, respectively. According to the simulation results, the operating frequency of the MIMO antenna system is 6.3 GHz, and mutual coupling is below −18 dB in a parallel arrangement, whereas they are 6.4 GHz and −25 dB, respectively, in the orthogonal arrangement. The 2 × 3 matrix of C-shaped resonator (CSR) is proposed and placed between the antenna elements over the substrate, to reduce the mutual coupling and enhance the isolation between the antennas. More than 30 dB isolation between the array elements is achieved at the resonant frequency for both of the configurations. The essential parameters of the MIMO array such as mutual coupling, surface current distribution, envelop correlation coefficient (ECC), diversity gain (DG), and the total efficiency have been simulated to verify the reliability and the validity of the MIMO system in both parallel and orthogonal configurations. The experimental results are also provided and compared for the mutual coupling with simulated results. An adequate match between the measured and simulated results is achieved.

scholarly journals PENGARUH PENYUSUNAN POLARISASI PADA SISTEM ANTENA MIMO TERHADAP KAPASITAS KANAL

2020 ◽  
Vol 5 (1) ◽  
pp. 13
Author(s):  
Abdurrahman Rizki ◽  
Alloysius Adya Pramudita ◽  
Trasma Yunita
Keyword(s):  
Circular Polarization ◽  
Channel Capacity ◽  
Mimo System ◽  
Signal To Noise Ratio ◽  
Multiple Input Multiple Output ◽  
Antenna System ◽  
Mimo Antenna ◽  
Left Hand ◽  
Multiple Input ◽  
Input Multiple Output

Multiple Input Multiple Output (MIMO) system is a technology that has the potential to be developed to increase channel capacity. The increase in channel capacity in the MIMO system is not only determined by the number of antennas, but is determined by the characteristics and arrangement of the antenna concept. This study identifies the effect of circular polarization on the MIMO antenna system on channel capacity. Co-polarization consists of a Left Hand Circular Polarization (LHCP) and Right Hand Circular Polarization (RHCP) configuration, while cross-polarization consists of an RHCP-LHCP configuration. The co-polarization of the antenna with the LHCP configuration results in an estimated channel capacity of 11,578 bps / Hz when it is at the lowest Signal to Noise Ratio (SNR) is 5 dB

High isolation and compact MIMO antenna system with defected shorting wall

2014 ◽  
Vol 7 (2) ◽  
pp. 167-172 ◽  
Author(s):  
Xi-Wang Dai ◽  
Long Li ◽  
Zhen-Ye Wang ◽  
Chang-Hong Liang
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Local Area ◽  
Antenna System ◽  
Area Network ◽  
Mimo Antenna ◽  
High Isolation ◽  
Input Multiple Output

In this paper, a compact multiple-input multiple-output (MIMO) antenna system with high isolation is proposed for 2.4 GHz wireless local area network (WLAN) application. The system is composed of two aperture-coupled shorted patch antennas with a spacing of 4 mm (only 0.032λ). The antenna is fed with an H-shaped coupling slot, and the defected shorting wall is used for high isolation. The proposed MIMO system exhibits an isolation of better than −20 dB and a maximum isolation of −43 dB at the central frequency. The envelope correlation coefficient is less than 0.01. The simulated and measured results show that the proposed antenna is a good candidate for MIMO system with higher isolation and better diversity.

PERFORMANCE ANALYSIS OF SPATIAL MODULATION IN MIMO- A SURVEY

2015 ◽  
Vol 2 (2) ◽  
Author(s):  
PILITHA CHANDRAN K ◽  
C.D. SURIYAKALA
Keyword(s):  
Data Transmission ◽  
Antenna Selection ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Main Idea ◽  
Time Instant ◽  
Antenna System ◽  
Spatial Modulation ◽  
Modulation Scheme ◽  
Mimo Antenna

Spatial modulation (SM) is a recently developed transmission technique that uses index of antenna in a multiple input multiple output (MIMO) antenna system, as additional means of data transmissions. The use of index of the active antennas at any time instant is the main idea behind spatial modulation. The information bits to be transmitted are divided into two parts. The first part is mapped to a symbol chosen from the signaling constellation, where depending on modulation scheme the number of bits per symbol varies. The second part determines the antenna index to be selected from a set of antennas available for data transmission. Thereby increases the spectral efficiency and decreases the complexity at receiver section. The rate of data transmission can much more increased by mapping into subsets of antennas in MIMO. The paper summarizes some of the recent works and issues of SM MIMO. The antenna selection in spatial modulation mainly depends on the incoming information data which is unlike the antenna selection in conventional MIMO system which depends on the channel state information (CSI) and the received signal strength.

scholarly journals A Compact Quad-Element UWB-MIMO Antenna System with Parasitic Decoupling Mechanism

2019 ◽  
Vol 9 (11) ◽  
pp. 2371 ◽  
Author(s):  
Fatima Amin ◽  
Rashid Saleem ◽  
Tayyab Shabbir ◽  
Sabih ur Rehman ◽  
Muhammad Bilal ◽  
...  
Keyword(s):  
Mutual Coupling ◽  
Mimo System ◽  
Ground Plane ◽  
Research Work ◽  
Spatial Diversity ◽  
Antenna System ◽  
Ultra Wideband ◽  
Personal Area Networks ◽  
Back Side ◽  
Mimo Antenna

This research work proposes a compact four-port multiple-input multiple-output (MIMO) antenna that operates in the whole license free ultra-wideband (UWB) spectrum of 3.1–10.6 GHz. Spatial diversity has been introduced by arranging these antennas in close proximity without developing a strong mutual coupling. Antenna elements are evolved from a conventional rectangular patch antenna whereas a customized decoupling structure is introduced on the back side of the substrate to achieve the desired isolation level. The parasitic decoupling structure consists of different features which are resonant at different frequencies offering a whole UWB coverage. In addition to the decoupling structure a dumbbell shaped stub has also been introduced to the partial ground plane to suppress the mutual coupling. The overall measured isolation among elements is more than 20 dB. Different MIMO performance parameters have also been investigated from the measured results. Whole MIMO system measures 0.41 λo × 0.44 λo at 3.1 GHz. The MIMO system is intended for high data rate and short-range communication devices used in wireless personal area networks.

scholarly journals Muli-UWB Antenna System Design for 5G Wireless Applications with Diversity

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Marwa Daghari ◽  
Chaker Essid ◽  
Hedi Sakli
Keyword(s):  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Antenna System ◽  
Total Efficiency ◽  
Defected Ground Structure ◽  
Mimo Antenna ◽  
Mimo Antennas ◽  
Wireless Applications ◽  
Multiple Input ◽  
Input Multiple Output

In this paper, we propose a compact Multiple Input Multiple Output (MIMO) antenna system with high isolation for wireless applications in 5G connected devices. This MIMO antenna system with the size of 92 × 88   m m 2 consists of two elliptical antennas symmetrically arranged next to each other. Two decoupling methods which are neutralization and Defected Ground Structure (DGS) are applied to ensure diversity of the proposed MIMO antenna. The single and MIMO antennas are simulated and analyzed then fabricated and measured. A good agreement between measurements and simulations is obtained. These configurations, dedicated to covering the 3.4 GHz band -3.8 GHz, have shown very satisfactory performances more than -30 dB in terms of reduction of mutual coupling between the antennas constituting our system. MIMO diversity parameters, such as Envelope Correlation (ECC), Diversity Gain (DG), and total efficiency, are also studied for each proposed MIMO system. Thus, results demonstrate that our two proposed antenna configurations are very suitable for 5G MIMO applications.

scholarly journals Extreme Wide Band MIMO Antenna System for Fifth Generation Wireless Systems

2020 ◽  
Vol 10 (2) ◽  
pp. 5492-5495 ◽  
Author(s):  
H. Alsaif
Keyword(s):  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Single Layer ◽  
Wireless Systems ◽  
Wide Band ◽  
Antenna System ◽  
Ultra Wideband ◽  
Simulation Code ◽  
Mimo Antenna ◽  
Input Multiple Output

A new compact 2×2 Multiple Input Multiple Output (MIMO) antenna is presented in this paper, suitable for the new wireless communications. The proposed design also covers the complete ultra-wideband for short wireless systems. The antenna system is characterized by a super wideband covering radio frequency (RF) band starting from 2.97GHz to 19.82GHz. The MIMO system contains two ship-shaped monopoles with trimmed edges. These antennas are printed on a single layer of Rogers Duroid RT5880Lz with relative permittivity εr=1.96 and loss tangent δ of 0.0009. The overall size of the MIMO system is 20mm×47mm×1.6mm. The peak-achieved gain is 8.12dB with nearly omni-directional isotropic far field patterns. The design and simulation has been performed via an industrial simulation code.

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