Reducing Mutual Coupling of MIMO Antennas With Parasitic Elements for Mobile Terminals

Li, Zhengyi; Du, Z.; Takahashi, Masaharu; Saito, Kazuyuki; Ito, Koichi

doi:10.1109/tap.2011.2173432

Cited by 341 publications

(189 citation statements)

References 33 publications

(16 reference statements)

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“…During the recent years, numerous designs of MIMO antenna systems have been investigated for wireless applications and are mainly focused on sufficiently minimizing the effect of mutual coupling between radiating elements and presenting different convenient techniques in order to implement an efficient and compact MIMO system [6][7][8][9][10][11][12][13][14]. These systems were developed for various bands including single and/or dual band, GSM band, LTE band, WiMAX band, and two ISM bands covering 2.45 GHz and/or 5 GHz band.…”

Section: Introductionmentioning

confidence: 99%

“…These systems were developed for various bands including single and/or dual band, GSM band, LTE band, WiMAX band, and two ISM bands covering 2.45 GHz and/or 5 GHz band. The proposed methods for reducing mutual coupling included employing a simple microstrip patch element in between the antennas [6], using parasitic coupling elements between the radiators [7,8], connecting the elements employing a neutralization line [9,10], introducing resonators between the antenna elements [11], placing the antenna elements in an orthogonal configuration [12,13] and metamaterial-based antennas [14]. Alternatively, Electromagnetic Band Gap (EBG) cells [15] and partially extended ground [PEG] plane [16] may be used to eliminate coupling.…”

Section: Introductionmentioning

confidence: 99%

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Design of a Compact Orthogonal Broadband Printed Mimo Antennas for 5-GHZ Ism Band Operation

Naji¹

2015

PIER B

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Abstract-This paper presents a new design approach for compact orthogonal broadband printed multiple-input multiple-output (MIMO) antennas based on a coplanar waveguide (CPW)-fed hexagonalring monopole antenna (HRMA) element. The design procedure of the basic radiating element is initiated from a stripline (SL)-fed circular monopole antenna (CMA). Then various antennas involved in the design evolution process are introduced to attain a compact CPW-fed HRMA. This basic antenna element has a compact size of 13 × 10 mm 2 , 50% smaller than SL-fed CMA, and a prototype of this antenna is built and tested. Based on HRMA element, compact two-and four-element MIMO antenna systems are designed, fabricated and experimentally demonstrated for 5-GHz ISM band operation. The MIMO antenna systems use orthogonally configured of identical closely spaced HRMA elements, with CPW-fed printed on one side of the substrate to achieve good isolation. Design simulation is carried out with the aid of Computer Simulation Technology Microwave Studio (CST MWS) and confirmed with High Frequency Structure Simulator (HFSS). The experimental results are in close agreement with the simulated ones, which validates the design principle. Based on experimental results, the two MIMO antenna systems have an impedance bandwidth of more than 2 GHz, good isolation of less than 15 dB, and a low envelope correlation coefficient of better than −26 dB across the frequency band of (4-6 GHz), which are suitable for 5-GHz MIMO applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of a Compact Orthogonal Broadband Printed Mimo Antennas for 5-GHZ Ism Band Operation

Naji¹

2015

PIER B

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“…Various works appear in literature in which MIMO antenna systems are analyzed in terms of their effect on the multiplexing gain in different environments [5][6][7][8][9][10][11][12]. Some of them used theoretical models to emulate the channel and used the antenna elements radiation patterns to analyze the performance of the MIMO antenna system [8,11,12].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Reconfigurable Mimo Antennas for Channel Capacity in an Indoor Environment

Hussain¹,

Khan²,

Abu-Al-Saud³

et al. 2016

PIER C

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Abstract-In this paper, three different frequency reconfigurable multiple-input-multiple output (MIMO) antennas are characterized in terms of their channel capacity performance in an indoor environment. Two 2 × 2 and one 4 × 4 MIMO antenna configurations are investigated. A complete MIMO system is implemented using software defined radio (SDR) platform. The antenna under test can be used at either transmitter or receiver ends. The channel capacity of the system is evaluated by computing the channel coefficient matrix. The measurements are performed at 2.45 GHz for line of sight (LOS) and non-line of sight (NLOS) scenarios. A comparison of the antennas is performed with an ideal system scenario with totally uncorrelated channels as well as an array of standard monopoles which are half-wavelength apart. The effects of antenna element efficiencies, radiation patterns and spacings on the channel capacity are discussed.

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Section: Introductionmentioning

confidence: 99%

“…[7] presented a comparison between the measured mutual coupling effect on the ergodic channel capacity of a MIMO system in a Rayleigh channel and in Rician channel at Long Term Evolution (LTE) radio band. A method to reduce MC among MIMO antennas by inserting parasitic elements is proposed in [8], and the 1-D EBG and SRR structures were experimentally shown to be very effective in suppressing mutual coupling [9].In this paper, we will study the MC effect on multiple antennas system and derive some new expressions of receiving signal vector and power, channel correlation and capacity. Firstly, we construct an equivalent channel model Manuscript received May 10, 2016; revised July 13, 2016.…”

mentioning

confidence: 99%

Effect of Mutual Coupling on Multiple Antenna Channel

Xue¹,

Zhu²,

Chen³

et al. 2016

IJMO

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Abstract-The influence mechanism of mutual coupling (MC) on multiple antennas system are studied. Some new exact expressions of receiving signal vector, signal power and spatial correlation coefficient are derived, which includes the effect of MC. The capacity of multiple-input multiple-output (MIMO) channel with MC in different conditions is also discussed. Analysis and simulation results show that the modification of signal parameters cased by MC is related to the MC matrix, which is decided by antenna self-impendence, mutual impendence and load impedance.Index Terms-Mutual coupling (MC), MIMO channel, antenna pattern, channel capacity. I. INTRODUCTIONMultiple-input multiple-output (MIMO) technology can significantly improve the channel capacity of wireless systems under rich propagation environment. However, the advantage of MIMO system over signal antenna system depends on the channel characteristics such as spatial correlation. Since antenna's feathers are inherently included in the communication link, mutual coupling not only affects the antenna efficiency but also the system performance [1].Ref. [2] proved that the distance between antennas and the operation frequency difference are the main affect factors of mutual coupling. Wang in [3] presented an iterative autocalibration method to estimate unknown mutual coupling for a uniform circular array. In [4], the network theory was used to derive the channel transfer matrix, which includes the coupling effects on spatial correlation between different antennas. Lu and Hui [5] also proved that MC among antennas would limit the increase of capacity due to spatial proximity. In [6], the effects of MC on MIMO channel capacity under different coupling assumptions were analyzed and compared. [7] presented a comparison between the measured mutual coupling effect on the ergodic channel capacity of a MIMO system in a Rayleigh channel and in Rician channel at Long Term Evolution (LTE) radio band. A method to reduce MC among MIMO antennas by inserting parasitic elements is proposed in [8], and the 1-D EBG and SRR structures were experimentally shown to be very effective in suppressing mutual coupling [9].In this paper, we will study the MC effect on multiple antennas system and derive some new expressions of receiving signal vector and power, channel correlation and capacity. Firstly, we construct an equivalent channel model Manuscript received May 10, 2016; revised July 13, 2016. The authors are with the Jiangsu Key Laboratory of Internet of Things and Control Technologies, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China. Zhu Qiuming is also with China Airborne Missile Academy, Luoyang 471009, China (e-mail: zhuqiuming@nuaa.edu.cn).with MC in both the transmitting and receiving arrays and give the receiving signal model including coupling in Section II. On this basis, the signal power and spatial correlation between multiple receiving antennas including MC will be given, and the effect of MC on channel capacity will also be studied in combining...

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Reducing Mutual Coupling of MIMO Antennas With Parasitic Elements for Mobile Terminals

Cited by 341 publications

References 33 publications

Design of a Compact Orthogonal Broadband Printed Mimo Antennas for 5-GHZ Ism Band Operation

Design of a Compact Orthogonal Broadband Printed Mimo Antennas for 5-GHZ Ism Band Operation

Characterization of Reconfigurable Mimo Antennas for Channel Capacity in an Indoor Environment

Effect of Mutual Coupling on Multiple Antenna Channel

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