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SUMMER TRAINING
A COMPACT MIMO
ANTENNA DESIGNAT
IIT-BHU VARANASI
ROHIT KUMAR GUPTA1002731079
ECE-D
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INTRODUCTION
Antenna performance and size have a large impacton the development of wireless system.
It is more complicated to provide the typicalparameters like Bandwidth, Efficiency, and Gainwithin the limited antenna volume.
MIMO (Multiple Input Multiple Output). It is anantenna technology that is used both intransmission and receiverequipment forwireless radio communication.
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INTRODUCTIONOF MIMO
There can be various MIMO configurations. For
example, a 2x2 MIMO configuration is 2 antennas to
transmit signals (from base station) and 2 antennas
to receive signals (mobile terminal).
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MIMO VS SIMO/MISO
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WHY MIMO?
Wireless channel that we are using is very unfriendly
Suffers from Cochannel interference and signal level
fading
It provides a limited bandwidth
power falls off with distance
There is always a need for increase in performance in
wireless systems
Significant increase in spectral efficiency and datarates
High Quality of Service (QoS)
Wide coverage, etc.
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DIVERSITY PARAMETERS
We characterized the MIMO antenna through the
diversity parameter. These parameters are following:
Diversity Gain
Envelope Correlation Coefficient (ECC)
Mean Effective Gain (MEG)
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OBJECTIVE
To investigate an material.
To identify suitable dielectric thickness for theantenna.
To investigate the suitable structure that will
give high directivity characteristics.
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METHODOLOGY
Modeling of the antenna.
Simulation and Design using HFSS
software.
Data Analysis from simulation Result
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HFSS SOFTWARE
HFSS stands for high frequency structure simulator, given
by Ansoft corporation.
It is high frequency full wave EM field simulator for
designing 3D model.
Used for designing antenna, filter, coupler, connector,
coax and waveguide.
It can calculate parameter like S- Parameter, Radiation
Frequency & field, VSWR, Return Loss.
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Handset
Evolution
Nowadays..
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Design Challenge for antenna
Small antennas Low mutual coupling
Light weight
Cheap
Multiband antennas Internal antennas
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DESIGNAND SIMULATIONS
We have done all the simulations on the software ansoft HFSS:1. Configuration of antenna:
The proposed antenna has been designed on FR4 substrate with dielectric constant 4.4 and
loss tangent 0.018. The size of ground plane of diversity antenna is chosen as 50 x 100 x
0.8 mm3. The proposed antennas are PIFA type and size of the antenna elements is 10 x 20
mm2. The PIFA are mounted at 4.8mm from the ground plane.
Front view Back view
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Contd
Antenna
parameter
Value
(mm)
Antenna
parameter
Value
(mm)
Wsub 50 Ws2 6Lsub 100 Ls3 8
Want 10 Ls4 2.5
Lant 20 Ls5 5
Ls1 18 Ws6 4Ws1 1 Xc 4
OPTIMIZED VALUE of ANTENNA SHAPE
PARAMETER
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The optimized simulated results of the proposed MIMO antenna are shown in
figure:WLAN (2.45/5.8 GHz).
Results and Discussion
Isolation: -14dB for WLAN Bands
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Parametric Analysis
Variation of parameter Ls3
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Contd
Variation of parameter Wsp
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1. Surface Current Distributions of proposed MIMO antenna.
2.45 GHz 5.8 GHz
Surface Current Distribution
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Envelope Correlation Coefficient (ECC):
Variation of ECC with frequency
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DIVERSITY PERFORMANCES
Frequency (MHz) Envelope Correlation
Coefficient (ECC)
Diversity Gain
(1%) (dB)
2.45 0.0135 9.97
5.80 0.0010 9.99
eapp
2
pp 1with*10G Diversity Gain:
Envelope Correlation Coefficient
(ECC):
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RADIATION PATTERNS
3D Radiation pattern (a) Antenn1 excited (b) Antenna 2 excited.
(a)
(b)
2.45 GHz
2.45 GHz
5.8 GHz
5.8 GHz
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CONCLUSION
A Compact Dual Band MIMO/Diversity Antenna for
WLAN Applications.
The proposed antenna covers the frequency band of
WLAN (2.4-2.45GHz).
The isolation between ports is below -14dB for both
bands of WLAN.
The envelope correlation coefficient for proposed
antenna is below 0.05 and diversity gain is almost 10 whichmeets the good diversity performances. The pattern of
proposed MIMO antenna follow pattern diversity.
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References[1]. R. G. Vaughan and J. B. Andersen, Antenna diversity in mobile communications, IEEE Trans. Veh. Tech., vol. VT-36, no. 4, pp.
149172, Nov. 1987.
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[4]. R. D. Murch and K. B. Letaief, Antenna systems for broadband wireless access, IEEE Commun. Mag., vol. 40, no. 4, pp. 76
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[5]. G. J. Foschini, Layered space-time architecture for wireless communication in a fading environment when using multi-element
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[6]. J. Wallace, M. Jensen, A. Swindlehurst, and B. Jeffs, Experimental characterization of the MIMO wireless channel: Data acquisition
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[7]. M. K. Meshram, R. K. Animeh, A. T. Pimpale, and N. K. Nikolova, A novel quad-band diversity antenna for LTE and Wi-Fiapplications with high isolation, IEEE Trans. Antennas Propag., Vol. 60, no. 9, pp. 4360-4371, Sep. 2012.
[8]. X. Zhou, X. L. Quan, and RongLin Li, A dual-broadband MIMO antenna system for GSM/UMTS/LTE and WLAN handsets, IEEE
Antennas Wireless Propag., Vol. 11, pp. 551-554, May. 2012.
[9]. G. Park, M. Kim, T. Yang, J. Byun, and A. S. Kim, The compact quadband mobile handset antenna for the LTE700 MIMO
application, IEEE Int. Symp. on Antennas and Propagation, 2009.
[10]. H. Bae, F. J. Harackiewicz, M. J. Park, T. Kim, N. Ki,, D. Kim, and B. Lee, Compact mobile handset MIMO antenna for LTE700
applications, Microw. Opt. Technol. Lett., vol. 52, no. 11, pp. 24192422, Nov. 2010.
[11].T.W. Kang and K.L. Wong, Internal printed loop/monopole combo antenna for LTE/GSM/UMTS operation in the laptop
computer, Microwave Opt Technol Lett 52 (2010), 16731678.[12]. C.T. Lee and K.L. Wong, Planarmonopole with a coupling feed and an inductive shorting strip for LTE/GSM/UMTS operation in
the mobile phone, IEEE Trans Antennas Propag 58 (2010), 24792483.
[13]. K.L. Wong, M.F. Tu, C.Y. Wu, and W.Y. Li, Small-size coupled fed printed PIFA for internal eight-band LTE/GSM/UMTS mobile
phone antenna, Microwave Opt Technol Lett 52 (2010), 21232128.
[14]. S.C. Chen and K.L. Wong, Bandwidth enhancement of coupled-fed on-board printed PIFA using bypass radiating strip for eight-
band LTE/GSM/UMTS slim mobilephone, Microwave Opt Technol Lett 52 (2010), 20592065.
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