Analysis of Patch's Shapes on Microstrip Monopole Antenna

8/10/2019 Analysis of Patch's Shapes on Microstrip Monopole Antenna

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Background

UWB (ultra wide band) has a highwireless data rates (480 Mbps )

UWB operate in the 3.1-10.6 GHz

need an wideband antenna with smalldimension

Problem: how to design microstrip

antenna with wider bandwidth but bydecrease Q factor


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Research objective

To improve the bandwidth of a microstripmonopole antenna by using a lowering Q

factor approach

To analyze the effect of widening patch on

the bandwidth of a microstrip monopole

antenna.

To analyze the effect of changing patchs

shapes on the bandwidth of a microstrip

monopole antenna.

To get the best patch shapes on monopole

microstrip antenna for UWB technology


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Problem statement

How to design a microstrip monopoleantenna using CST microwave 2010

simulator

How to improve bandwidth using alowering Q factor approach.


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Boundary

Using microstrip monopole Antenna

model.

Using CST 2010 simulator

Fabrication process of antenna using

fotoetching


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technology Frequency = 3.1-10.6 GHz

Wireless data rates = 480 Mbps Use :

1. Vehicular Radar Systems.

2. Medical imaging system.

3. Communications and Measurement Systems.


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Background: Design microstrip

problem Q factor vs Bandwidth

Q =

BW = fc / Q

Hypothesis:By increasing the diameter, we can decrease Inductance.

When inductance is decreased, Q factor too. And then,

we can increase the bandwidth [13]

[13] Laport, Edmund,RadioAntenna Engineering, Mc

Graw Hill, New York, 1952


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Review Literature on Broadband

techniques for microstrip patch

antennasApproach Techniques

Lower the Q Select the radiator shape

Thicken the substrate

Lower the dielectric constantIncrease the losses

Use impedance matching Insert a matching network

Add tuning elements

Use slotting and notching patches

Introduce multiple resonances Use parasitic (stacked or co-planar) elements

Use slotting patches, insert

impedance networks

Use an aperture, proximity

coupling


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Flow Chart of Antenna Design Process

Mulai

Menentukan spesifikasi

desain antena

Menentukan dimensi awal

Pemodelan

Uji simulasi dengan CST2010 Simulator

Optimasi antena(bentuk dan

ukuran patch)

Realisasi

prototipe

Pengukuran

Optimasi

prototipe

KesimpulanAnalisa Selesai

Hasil

simulasi

sesuai

dengan

spesifikasi

Memband

ingkan

dengan

hasil

simulasi

Tidak

Tidak

Ya

Ya


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Design and simulation


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Design Objectives for UWBs

Antenna

Frequency : 3,1-10,6 GHz

VSWR : 2

Gain : 0 dBi

Radiation pattern : Omni-directional

Polarization : Linier


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Transmission line

Wg = 50 mm Lg = 50 mm w = 3

mm


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Transmission line and stripline antenna:

The effect of ground-plane cutting

Ground-plane cutting

having effect to add EM

radiation capabilities

Basic

groundplane

After groundplane cutting


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Transmission line and stripline antennaBasic

groundplane

After groundplane cutting

G= -20,49 dBi

G= 2,891 dBi


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Parametric Studies of basic

antenna shape

Study to change the

dimension variables of

basic antenna shape

and its effect toantenna parameters


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Parametric Studies

Change ls

2

2.2

2.4

2.6

2.8

3

3.23.4

15.5 16.377 17.45 18.53 19.611 20.688 21.766 22.844 23.922 25

Frekuensi(GHz)

Ls (mm)

Pengaruh perubahan Ls terhadapfrekuensi resonansi


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Parametric studies

Change lg

Best => Lg = 29 mm Change Lg isnt to much

have an effect to change

a resonant frequency.

Its only affecting the

matching of antenna .


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Widening a patch can increase the bandwidth of anantenna

Parametric studies: Widen thepatch

Strip line Rectangular

Best => Sw =13.55 mm

g = 1.75 mm

Ls =15.3 mm Lg = 29 mm Wg = 35 mm

BW stripline = 869 MHz

BW Rectangular (widening stripline antenna patchs) = 7,503 GHz

f= 3,082-10,585 Ghz


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Parametric studies: Change patchshapes

half circular

Best =>

Ls =15.3 mm Lg = 29 mm Wg = 35 mm

BW half circular = 10,575GHz

f=2,306-12,881 GHz

R = 15.05

mm

g = 0.25 mm


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Changing patch shapes of antenna can increase the

bandwidth

Compare VSWR

Parameter Antena Rectangular Sirkular Semi sirkular Objective design

Range frekuensi

(GHz)

3,082-10,585 3,737-5,031 dan

6,111-12,906

2,306-12,881 3,1-10,6

Bandwidth (GHz) 7,503 8,089 10,575 7,5

R di ti tt


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Radiation pattern


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Polarization

All of them have a linier

polarization


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Compare

Parameter Antena Rectangular Sirkular Semi sirkular Objective design

Range frekuensi

(GHz)

3,082-10,585 3,737-5,031 dan

6,111-12,906

2,306-12,881 3,1-10,6

Bandwidth (GHz) 7,503 8,089 10,575 7,5

Pola radiasi Omnidirectional Omnidirectional Omnidirectional Omnidirectional

Gain (dbi) 5,779 5,506 5,824 0

Polarisasi linier linier linier linier

Best patch = semi sirkular


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Final Design


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Measurement and Analysis

N t k A l M i R lt


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Network Analyzer Measuring Results

1

1.5

2

2.5

3

3.5

0 2 4 6 8 10 12 14

VSWR

Frekuensi (GHz)

Perbandingan VSWR saat simulasi dan pengukuran

simulasi

pengukuran

vswr 2

Bw simulation =

10,575 Ghz

Bw measurement

=

10,285 GHz

Error = 2,77 %


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R di ti tt


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Radiation pattern

-30

-25

-20

-15

-10

-5

00

1020

30

40

50

60

70

80

90

100

110

120

130

140

150160

170180

190200

210

220

230

240

250

260

270

280

290

300

310

320

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350

-30

-25

-20

-15

-10

-5

0

010

2030

40

50

60

70

80

90

100

110

120

130

140

150160

170180

190200

210

220

230

240

250

260

270

280

290

300

310

320

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350

Elevation AzimuthRadiation pattern = Omni-directional


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Polarization

-20

-18

-16

-14

-12

-10

-8

-6

-4

-2

0

010

2030

40

50

60

70

80

90

100

110

120

130

140

150

160170

180190

200

210

220

230

240

250

260

270

280

290

300

310

320

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350

Measurement

Polarization = elips

Simulation

Polarization = linier


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Compare between simulation and

measurement

Parameter Spesifikasi awal Hasil simulasi Hasil Realisasi catatan

Bandwidth 7,5 GHz 10,575 Ghz 10,285 GHz Tercapai

Frekuensi kerja

(vswr 2)

3,1-10,6 Ghz 2,306-12,881Ghz 2,71513 Ghz Tercapai

Pola radiasi Omnidirectional Omnidirectional Omnidirectional Tercapai

Polarisasi Linier Linier Elips Tidak

Gain saat 4,34 GHz 0 dbi 3,854 dbi 3,806 dbi Tercapai


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Conclusions and Recommendations


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Conclusion Transmission line can be modified to

become a radiating element by cuttinga half of ground-plane

Bandwith can be increased by

lowering Q factor. Widening patch of antenna can

increase bandwidth

Changing patch shapes of antennacan improve bandwidth

Best patch for UWB is half circular.


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Recomendation

Try to use another patch shapes .

Try to use slotting and notching

patches

Try to analyze the groundplane

Use an anechoic chamber when doing

a measurement

R f


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Reference Alaydrus, Mudrik DR-Ing.nAntena Prinsip & Aplikasi .Yogyakarta : Graha Ilmu.

Balanis, C. A.. 2005.Antenna Theory Analysis and Design. John Wiley & Sons, Inc.

Davis, S.K.,dkk. 2008. Breast Tumor Characterization Based on Ultrawideband Microwave Backscatter,

IEEE Transactions on biomedical engineering , vol.55, no1. January 2008 Di Benedetto, M.G., dkk. ed. 2006. UWB Communications Systems: A Comprehensive Overview,

EURASIP Series on Signal Processing and Communications. 8thed. New York : Hindawi Publishing.

Federal Communications Commission (FCC). 2002. First Report and Order in The Matter of Revision ofPart 15 of the Commissions Rules Regarding Ultrawideband Transmission Systems, ET-Docket 98-153,FCC 02-48

Fontana, R.J. 1997.An Ultra Wideband Communication Link for Unmanned Vehicle Applications,Proceedings AUVSI 97, Baltimore, MD, June 3-6, 1997.

Fontana, R.J., dkk. 2002.An Ultra Wideband Radar for Micro Air Vehicle Aplications. Proceedings IEEE

Conference on Ultra Wideband Systems and Technologies, May 2002. Francis Jacob, K. 2008. Printed monopole antenna for ultra wide band (UWB) applications,Thesis of

Cochin University of Science and Technology.

Garg, Ramesh. 2001. Microstrip Antenna Design Handbook. Artech House, Inc

Hounoki, Mana, dkk. 2006. Wideband Characteristics of Rounded Circular and Semi-Circular MonopoleAntennas, International Symposium on Antennas and PropagationISAP 2006

J. Liang. 2006.Antenna Study and Design for Ultra Wideband Communication Applications, Thesis ofUniversity of London.

J. Liang, dkk. 2005. Study of a Printed Circular Disc Monopole Antenna for UWB Systems, IEEETransactions on Antennas and Propagation, vol. 53, no. 11, November 2005, pp.3500-3504.

Laport, Edmun A. 1952. Radio Antenna Engineering. New York : McGraw-Hill Book company, Inc.

Panda, J.R., Rakhesh S.K,. 2009. Parametric Study of Printed Rectangular Monopole Antenna.International Journal of Recent Trends in Engineering, Vol 1, No. 3

Raquel C.C ,dkk.Antenna Configuration For Ultra Wide Band Radar Detection Of Breast Cancer,Procedings of SPICE ,vol 7169,1M1-12

Sam, aswathy.,Amir A.J.A. 2013. Ultra wideband radar based breast cancer detection using stackedpatch and wide slot antenna. International Journal of Electronics Signals and Systems (IJESS), ISSN:2231- 5969, Vol-3, Iss-1, 2013

Z. N. Chen and M. Y. W. Chia. 2006. Broadband Planar Antennas Design and Applications. England :John Wiley & Sons Ltd.


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Analysis of Patch's Shapes on Microstrip Monopole Antenna