Training Report IIT-BHU

7/27/2019 Training Report IIT-BHU

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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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