Investigation on decoupling of wide band wearable multiple‐input multiple‐output antenna elements using microstrip neutralization line

2019 ◽  
Vol 29 (7) ◽  
pp. e21723 ◽  
Author(s):  
Ashim Kumar Biswas ◽  
Ujjal Chakraborty
Keyword(s):  
Multiple Input Multiple Output ◽  
Wide Band ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Neutralization Line

Octagonal-shaped wideband MIMO antenna for human interface device and S-band application

2018 ◽  
Vol 11 (3) ◽  
pp. 287-296 ◽  
Author(s):  
Sanjay Chouhan ◽  
Debendra Kumar Panda ◽  
Vivek Singh Kushwah ◽  
Pankaj Kumar Mishra
Keyword(s):  
Multiple Input Multiple Output ◽  
Wide Band ◽  
Human Head ◽  
Impedance Bandwidth ◽  
Mimo Antenna ◽  
Human Interface ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Safety Limit ◽  
Interface Device

AbstractA four-element wide-band octagonal ring-shaped antenna is proposed for human interface device and S-band applications. The isolation structure comprises a parasitic element and a T-shaped structure. The antenna has −10 dB impedance bandwidth 63% (2.1–4.0 GHz) with miniaturized dimension of 54.98 mm × 76 mm. The multiple input multiple output (MIMO) antenna gain is 2.83 dBi at the 2.4 GHz resonant frequency. The designed MIMO has envelop correlation coefficient of 0.026 in the 2:1 VSWR band. The −10 dB total active reflection coefficient bandwidth of 1.2 GHz has been achieved in the entire frequency band, and has MEG value of ≤−3 dB. The specific absorption rate has found below the safety limit near the human head, palm and wrist.

scholarly journals Neutralization Line Decoupling Tri-Band Multiple-Input Multiple-Output Antenna Design

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 27018-27026 ◽  
Author(s):  
Ruipeng Liu ◽  
Xing An ◽  
Hongxing Zheng ◽  
Mengjun Wang ◽  
Zhenbin Gao ◽  
...  
Keyword(s):  
Multiple Input Multiple Output ◽  
Antenna Design ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Neutralization Line

scholarly journals Compact Fractal MIMO antenna for UWB applications

2021 ◽  
Vol 20 ◽  
pp. 146-151
Author(s):  
Edgar Alejandro Andrade-Gonzalez ◽  
Juan Carlos Ordoñez-Martínez ◽  
Mario Reyes-Ayala ◽  
José Alfredo Tirado Méndez ◽  
Hilario Terres-Peña
Keyword(s):  
Multiple Input Multiple Output ◽  
Wide Band ◽  
Antenna System ◽  
Wide Frequency Range ◽  
Frequency Range ◽  
Mimo Antenna ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Uwb Applications ◽  
Uwb Communication

In this article, a compact ultra-wide band (UWB) multiple input multiple output (MIMO) antenna system is showed. This antenna is based on fractal Fibonacci circles and operates over wide frequency range from 2.9 to 14.51 GHz. The dielectric used was Duroid substrate with dielectric constant εr = 2.2 and thickness of substrate 1.27 mm. This UWB MIMO antenna is simulated by HFSS. In order to improve the isolation between the elements of the antenna a parasitic structure is used, getting S12 and very low ECC. Also, the Total Active reflection Coefficient (TARC) was obtained. Proposed antenna can be used for UWB communication applications and its size is 64 × 38mm2

Compact 4-Port UWB-MIMO Slot Antenna with Dual Polarization and Low Correlation for Spatial Diversity Application

Frequenz ◽  
2018 ◽  
Vol 72 (11-12) ◽  
pp. 503-509
Author(s):  
Rohit Mathur ◽  
Santanu Dwari
Keyword(s):  
Multiple Input Multiple Output ◽  
Wide Band ◽  
Spatial Diversity ◽  
Slot Antenna ◽  
Dual Polarization ◽  
Low Correlation ◽  
Compact Size ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Better Than

Abstract A compact 4-port ultra-wide band (UWB) multiple-input-multiple-output (MIMO) slot antenna with dual polarization is presented. The key features of antenna are: has directive radiation in two planes and low correlation without use of additional decoupling structure. The antenna contains four microstrip feedlines having circular patches backed by stepped circular slots. Orthogonal arrangement of each slot antenna increases compactness with polarization diversity and good isolation. The antenna has compact size of 36×36×0.8 mm3. It operates in the frequency band of 3.1 to 11.9 GHz and isolation is better than 15 dB. The superior diversity performance is ensured by calculating envelope correlation coefficient (ECC) and diversity gain. In addition to guarantee distortion less transmission in UWB group delay is also measured.

scholarly journals Review on the Design of the Isolation Techniques for UWB-MIMO Antennas

2018 ◽  
Vol 7 (4) ◽  
pp. 46-70 ◽  
Author(s):  
I. Gnanaharan ◽  
R. Anbazhagan
Keyword(s):  
Multiple Input Multiple Output ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Orthogonal Polarization ◽  
Defected Ground Structure ◽  
Isolation Techniques ◽  
Capacity Loss ◽  
Data Rates ◽  
Multiple Input ◽  
Input Multiple Output

Ultra wide band - Multiple Input Multiple Output antenna technology provides higher data rates and the combination of the ultra wide band (UWB) and the multiple input multiple output (MIMO) technologies provides a solution for the demand of still higher data rates i.e. in excess of 3 Gb/sec in the future.  As the antenna technologies are improving, the size of the MIMO antenna is growing smaller and smaller. Placing the antenna elements in such close proximity increases the coupling between them. Various isolation techniques have to be introduced between the antenna elements to decrease the coupling and to improve the isolation. A study of the various isolation enhancement techniques have been made in this review. It analyses the various isolation enhancement methods such as using orthogonal polarization, parasitic elements, varied decoupling structures, defected ground structures (DGS), neutralization line (NL) and finally by using metamaterials. Metamaterials is a technology to perk up the isolation between the antenna elements. Split ring resonator (SRR) behaves as a metamaterial and it is used as an isolation mechanism in this study. The antennas are simulated and the results are compared. The method using parasitic elements gives the highest isolation of 35 dB and it is 5 dB better than the methods using orthogonal polarization and using the decoupling structure. The performance of all the antennas satisfies the conditions for minimum isolation. The envelope correlation coefficient is nearly zero in all the antennas and it implies good diversity performance. The diversity gain is also calculated for the various antennas and it satisfies good diversity performance. The bandwidth of the antennas is in the UWB frequency range and they have a fractional bandwidth above the required value of 1.09. The capacity loss for all the antennas is very low and the antennas using defected ground structure and the decoupling structure gives very low capacity loss.

scholarly journals Design of SWB MIMO Antenna with Extremely Wideband Isolation

Electronics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 194 ◽  
Author(s):  
Habib Ullah ◽  
Saeed Ur Rahman ◽  
Qunsheng Cao ◽  
Ijaz Khan ◽  
Hamid Ullah
Keyword(s):  
Mutual Coupling ◽  
Multiple Input Multiple Output ◽  
Wide Band ◽  
Impedance Bandwidth ◽  
Frequency Range ◽  
Mimo Antenna ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Swb Applications ◽  
Compact Planar

This paper presents a compact planar multiple input multiple output (MIMO) antenna for super wide band (SWB) applications. The presented MIMO antenna comprises two identical patches on the same substrate. Dimensions of the MIMO antenna are 0.17λ × 0.20λ × 0.006λ mm3, with respect to the lowest resonance of 1.30 GHz. The SWB antenna was manufactured using F4B substrate having a dielectric constant of 2.65 that provides a percent impedance bandwidth and bandwidth ratio of 187% and 30.76:1, respectively. The mutual coupling between the antenna elements is suppressed by placing a T-shaped corrugated strip in the mid of two antenna elements. The proposed MIMO antenna exhibits maximum diversity gain of 10 dB, low mutual coupling (<−20 dB), low envelope correlation coefficient (ECC < 0.02), efficiency >80%, and low reflection coefficient (<−10 dB) in the SWB frequency range (1.30 GH–40 GHz). The presented antenna is a good candidate for SWB applications. The designed antenna has been experimentally validated, and the simulated results were also verified.

scholarly journals Design and Investigation of Modern UWB-MIMO Antenna with Optimized Isolation

Micromachines ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 432
Author(s):  
Muhammad Irshad Khan ◽  
Muhammad Irfan Khattak ◽  
Saeed Ur Rahman ◽  
Abdul Baseer Qazi ◽  
Ahmad Abdeltawab Telba ◽  
...  
Keyword(s):  
Multiple Input Multiple Output ◽  
Wide Band ◽  
Impedance Bandwidth ◽  
Mimo Antenna ◽  
High Isolation ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Uwb Applications ◽  
Total Impedance ◽  
Swb Applications

This paper proposes a compact, semi-circular shaped multiple input multiple output (MIMO) antenna design with high isolation and enhanced bandwidth for ultrawide band (UWB) applications. A decoupling stub is used for high isolation reaching up to −55 dB over the entire bandwidth. The proposed antenna is used for UWB as well as super wide band (SWB) applications. The overall size of the proposed antenna is 18 × 36 × 1.6 mm3. The | S 11 | and voltage standing wave ratio (VSWR) of the proposed antenna are less than −10 dB and 2, respectively, in the range of 3–40 GHz. The total impedance bandwidth of the proposed design is 37 GHz. The VSWR, | S 11 | , | S 22 | , | S 21 | , | S 12 | , gain, envelope correlation coefficient (ECC), radiation pattern, and various other characteristic parameters are discussed in detail. The proposed antenna is optimized and simulated in a computer simulation technology (CST) studio, and printed on a FR4 substrate.

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