scholarly journals An Optimal Design of Multiple Antenna Positions on Mobile Devices Based on Mutual Coupling Analysis

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Peerapong Uthansakul ◽  
Danai Assanuk ◽  
Monthippa Uthansakul
Keyword(s):  
Mobile Device ◽  
Mobile Communications ◽  
Mutual Coupling ◽  
Mimo Systems ◽  
Practical Implementation ◽  
Multiple Antenna ◽  
Multiple Antenna Systems ◽  
Mimo Antenna ◽  
Channel Variation ◽  
Main Factor

The topic of practical implementation of multiple antenna systems for mobile communications has recently gained a lot of attention. Due to the area constraint on a mobile device, the problem of how to design such a system in order to achieve the best benefit is still a huge challenge. In this paper, genetic algorithm (GA) is used to find the optimal antenna positions on a mobile device. Two cases of3×3and4×4MIMO systems are undertaken. The effect of mutual coupling based onZ-parameter is the main factor to determine the MIMO capacity concerning the objective function of GA search. The results confirm the success of the proposed method to design MIMO antenna positions on a mobile device. Moreover, this paper introduces the method to design the antenna positions for the condition of nondeterministic channel. The concern of channel variation has been included in the process of finding optimal MIMO antenna positions. The results suggest that the averaging position from all GA solutions according to all channel conditions provides the most acceptable benefit.

scholarly journals MUTUAL COUPLING EFFECT ON MIMO ANTENNA

2014 ◽  
pp. 247-250
Author(s):  
BHUSHAN R. KALAMKAR ◽  
SACHIN S. KHADE ◽  
B.L. BADJATE
Keyword(s):  
Antenna Array ◽  
Mutual Coupling ◽  
Mimo Systems ◽  
Coupling Effect ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Correlation Coefficients ◽  
Mimo Antenna ◽  
Input Multiple Output ◽  
Plate Antenna

To reduce mutual coupling effect on MIMO Antenna this paper presents the analysis of bent ground plane antennas for multiple-input-multiple-output (MIMO). First, the three plate antenna array patterns of the envelope correlation coefficients are proposed to evaluate the diversity performance of antennas in MIMO systems. Following this, a compact three-element suspended plate antenna array with a bent ground plane is presented. The diversity performance of the design is experimentally and numerically analysed.

Mutual coupling reduction of multiple antenna systems

2020 ◽  
Vol 21 (3) ◽  
pp. 366-376
Author(s):  
Jia-yin Guo ◽  
Feng Liu ◽  
Guo-dong Jing ◽  
Lu-yu Zhao ◽  
Ying-zeng Yin ◽  
...  
Keyword(s):  
Mutual Coupling ◽  
Multiple Antenna ◽  
Multiple Antenna Systems ◽  
Antenna Systems ◽  
Mutual Coupling Reduction

scholarly journals Design and Implementation of MIMO Antenna Using Swastika Slot for Wireless Applications

2019 ◽  
Vol 8 (3) ◽  
pp. 3972-3976
Keyword(s):  
Mutual Coupling ◽  
Mimo Systems ◽  
Multiple Input Multiple Output ◽  
Multipath Fading ◽  
Substrate Material ◽  
Signal Loss ◽  
Mimo Antenna ◽  
Mimo Antennas ◽  
Input Multiple Output ◽  
5 Ghz

MIMO (Multiple-Input Multiple-Output) antenna has gained a lot of attention for research today due to various advantages such as increase in capacity, low signal loss, and less multipath fading. The main objective of this work is to design and implement a compact antenna using MIMO systems to reduce the mutual coupling between the antenna elements and to provide high isolation for Wi-Fi (2.4 GHz to 5 GHz) & Bluetooth (2.4 GHz to 2.57 GHz) and WLAN 802.11(2.4-2.485 GHz) applications. Different shapes of MIMO antennas are implemented but they have some interference with high mutual coupling and low gain. In order to avoid this, “Dumbell” shaped patch is introduced with a ‘Swastika’ slot between the patches. The antenna is designed over a frequency of 2.51GHz using FR4 epoxy as a substrate material. The proposed antenna shows better performance than many existing systems with an overall size of 93.02 × 54.72 mm2 having isolation better than -16 dB, obtained gain of 8.29 dB and envelope correlation coefficient (ECC) is investigated about 0.0092. The proposed MIMO antenna is simulated using HFSS 18.0 (High Frequency Structural Simulator) software and fabricated to validate the results. It is clearly observed that simulated results are close to practical measured results.

scholarly journals Bandwidth Enhancement and Mutual Coupling Reduction Using a Notch and a Parasitic Structure in a UWB-MIMO Antenna

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Jiwan Ghimire ◽  
Kwang-Wook Choi ◽  
Dong-You Choi
Keyword(s):  
Mutual Coupling ◽  
Mimo Systems ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Back Side ◽  
Bandwidth Enhancement ◽  
Mimo Antenna ◽  
Input Multiple Output

The correlation between the antennas of multiple-input, multiple-output (MIMO) systems in limited spaces and size degrades the performance and capacity by either using complex coupling or decoupling structures. For isolation improvement, this paper presents the simple design of a compact high-isolation ultra-wideband (UWB) MIMO antenna with a circular parasitic element at the back side of the radiating patch, thereby creating the reverse coupling and helping reduce the mutual coupling at the upper part of the frequency bands, and a small rectangular notch at the ground plane to extend the impedance bandwidth of the monopole antenna. This approach eliminates the use of complex coupling or decoupling structures and complex feeding networks. A novel feature of our design is that the MIMO antenna exhibits a very low envelope correlation coefficient (ECC < 0.007) with high diversity gain (DG > 9.99) and wide impedance bandwidth of 139 % from 3.1 to 17.5 GHz applicable for not only UWB application, but also next generation wireless communication, 5G. The high peak gain over the entire UWB and the upper part of the overall frequency band ensure that the antenna can be used in MIMO applications owing to the close agreement between the simulated and measured results.

scholarly journals Comments and Corrections to “Capacity of Multiple-Antenna Systems With Both Receiver and Transmitter Channel State Information”

2019 ◽  
Author(s):  
Kamal Singh ◽  
Chandradeep Singh
Keyword(s):  
Channel State Information ◽  
Mimo Systems ◽  
Ergodic Capacity ◽  
Mimo Channel ◽  
Multiple Antenna ◽  
Channel State ◽  
State Information ◽  
Multiple Antenna Systems ◽  
Capacity Curves ◽  
Multiple Input

<div>In this correspondence, we correct the ergodic capacity versus SNR curves of the coherent multiple-input</div><div>multiple-output (MIMO) channel in independent and identically distributed (IID) Rayleigh fading in the correspondence cited in the title. More importantly, the corrected capacity results present an interesting and compelling contrast between performances of the coherent MIMO systems with and without channel state information at the transmitter; whereas this view is somewhat limited in in the correspondence cited in the title because of flaws in the capacity curves.</div>

scholarly journals Comments and Corrections to “Capacity of Multiple-Antenna Systems With Both Receiver and Transmitter Channel State Information”

2019 ◽  
Author(s):  
Kamal Singh ◽  
Chandradeep Singh
Keyword(s):  
Channel State Information ◽  
Mimo Systems ◽  
Ergodic Capacity ◽  
Mimo Channel ◽  
Multiple Antenna ◽  
Channel State ◽  
State Information ◽  
Multiple Antenna Systems ◽  
Capacity Curves ◽  
Multiple Input

<div>In this correspondence, we correct the ergodic capacity versus SNR curves of the coherent multiple-input</div><div>multiple-output (MIMO) channel in independent and identically distributed (IID) Rayleigh fading in the correspondence cited in the title. More importantly, the corrected capacity results present an interesting and compelling contrast between performances of the coherent MIMO systems with and without channel state information at the transmitter; whereas this view is somewhat limited in in the correspondence cited in the title because of flaws in the capacity curves.</div>

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