Multi-element multi-polarized antenna

7/29/2019 Multi-element multi-polarized antenna

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Design of a Multi-element Multi-polarizedAntenna that enables applications based onpolarization diversity

H.T. Hayvaci, B.M. Elnour, D. Erricolo

Department of ECE, University of Illinois at Chicago

Chicago, IL 60607 USA

Presented at2007 URSI

North American Radio Science MeetingURSI - CNC/USNC

July 22-26, Ottawa, ON, Canada


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Outlinen Introductionn Review

q Multiple Input Multiple Output, MIMOn Advantages of MIMO Antennasn Some Suggested Antenna Configuration

q Tri-polarized Antenna (Tripole)q MIMO Cube

n

HFSS Designn Resultsn ConclusionHayvaci, Elnour, Erricolo Design of a Multi-element Multi-polarized Antenna that enables applications based on polarization diversity


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Introduction

Multi-element multi-polarized antenna utilizes polarization diversity tomeasure EM fields in space in a multi-path environment.

There is a strong agreement on the advantages of using polarizationdiversity along with space diversity for wireless applications.

Such an antenna has plenty of potential for applications that involvewireless communications and sensing.

Hayvaci, Elnour, Erricolo Design of a Multi-element Multi-polarized Antenna that enables applications based on polarization diversity


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IntroductionFor wireless communications applications such as Multiple

Input Multiple Output (MIMO) systems, there is analyticalevidence that an antenna that measures the full EM field mayincrease the capacity of transmission channel up to three foldsrelative to dual-polarized radio signals

For sensing applications, this type of antenna would improvethe estimation accuracy of the direction of arrival of the signal

from either one or two sources (Nehorai and Paldi, 1994)

In this work, we investigated the suggested antennageometries such as MIMO cube, Tripole Antenna utilizingpolarization diversity

We applied the ideas of the MIMO cube and of the TripoleAntenna by using loop antennas instead of dipoles.

MIMO Cube

Tripole Antenna

Loop AntennaHayvaci, Elnour, Erricolo Design of a Multi-element Multi-polarized Antenna that enables applications based on polarization diversity


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MIMO

MIMO wireless systems use multiple antenna elements attransmit and receive to improve channel capacity

Multi-path wireless environment



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Advantages of MIMO Antennas

Agreement on the advantages of using polarization diversity atwireless applications

Provide essential development on high data rate communicationsystems

Challenges of Designing a non-distributed MIMO antenna:Mutual CouplingFeeding Structures



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Some Suggested Antenna Configurations

Tri-polarized Antenna (Tripole)by M.R. Andrews, P.P. Mitra and R. deCarvalho

MIMO cube by B.N. Getu and J. Bach Andersen



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HFSS 3D ModelSix identical loop antennas are used

for three independent channel

All antennas are orthogonal to eachother providing independent channels

q Substrate Material: Rogers 4003,er=3.38, H=1.5mm

q Dielectric material dimensions are90mm x 90mm

q Optimized radius of loops are30.5mm, 2mm wide traces.

q Bottom Ground Patch: 22mm x22mm, Top Ground Arms are 4mmwide

Operating frequency: 2.67GHz

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Results: 3-D Radiation Pattern


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Results: Reflection Coefficients



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Results: Isolation dB

S16, S35, S24

S12,S13,S14,S15,S23,S25,S26,S34,S36,S45,S46,S56



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Antenna Impedance (Ohm)

Hayvaci, Elnour, Erricolo Design of Multi-element Multi-polarized Antennas that enable applications based on polarization diversity


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Conclusion

Three independent channels are achieved with thisconfiguration, with extra three channels providing analternate multi-path channel in case of sever fading fororiginal channel.

Antennas have good radiation characteristics with Returnloss of 27dB or better.

Antennas have a good isolation between elements sinceantennas are not co-located with isolation of 14dB or better



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Future work

The cube will be simulated with dipoles and loops toinvestigate the option of having six independent channelsinstead of three.

Some other dual-polarized antennas will be used as

antenna element.We are going to build the antenna and make somemeasurements.

The new antenna will be investigated for signalprocessing applications to confirm the validity of the sixindependent channels compared to a classical vectorantenna.



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Thank you!Questions?


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Multi-element multi-polarized antenna