1. A Compact Patch Antenna for Ultrawideband Application
M. Tarikul Islam , M. Samsuzzaman, M. M. Islam ,M.Z.Mahmmud, M.T. Islam
Presented by
Md. Tarikul Islam
Patuakhali Science and Technology University

2. Presentation Outline Introduction Background Objective Antenna Design
Results & Discussion
Conclusion
References
ICISET-2016

3. Introduction Overview:
Geographical Location: The main campus of the PSTU is located at  about 20 km north from the district town of Patuakhali and  about 38 km south from the divisional city of Barisal. The outer campus is situated at Babuganj under Barisal district.
Total Students: 3000
Faculty: 8
ICISET-2016

4. Introduction
A compact and wideband antenna is desirable for all modern wireless communication systems .
Conventional microstrip patch antenna is attractive for the low profile and light weight but repulsive for the large lateral size and narrow impedance bandwidth.
Thus, it is not readily suitable for the emerging Ultra-wideband(UWB) technology
Radio systems based on UWB technology offer opportunities for
high resolution radar imaging,
transmission of high data rate signals and
low probability of interrupt, especially in multi-user network applications, etc.
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5. Ultra wideband (UWB)
Wireless technology for transmitting digital data over a wide spectrum of frequency bands with very low power.
Wide bandwidth : > 500MHz
Advantages
Wide Bandwidth
Low power consumption
High data transmission rate
High speed
Low cost
Low complexity
Applications
Communication Systems (Wireless Personal Area Network)
Sensors Networks
Radar and Imaging
Positioning and Tracking
Wireless Body Area Network
ICISET-2016

6. Background
In the past, many impedance bandwidth-enhancement techniques for microstrip patch antennas have been developed,
including the employment of a thick substrate,
parasitic patches,
U-shaped-slot patch, and
L-probe feed, etc.
However, all these techniques achieve a bandwidth of approximate 80%.
ICISET-2016

7. Background
In 1998, a new balanced antenna was proposed by Guillanton et al. for UWB application.
A double-sided printed bow-tie antenna for UWB application was proposed by(Kiminami et al., 2004) for Short range wireless communication technology.
Small UWB Planar Monopole Antenna was proposed in 2012 where a diamond-shaped-patch that covers the ultra-wideband (UWB) frequency range by Foudazi and Hassani.
A high-performance Hibiscus petal pattern patch with tapered microstrip-fed line and partial trapezoid ground plane UWB antenna(Mahmud et al., 2016) was presented.
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8. Broadbanding Techniques
Rectangular slotted patch
Microstrip line-fed
Tapered slotted ground
Copper sheet.
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9. Objectives
To design a compact microstrip patch antenna for ultra-wideband application.
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10. Desired Ultra wideband Specifications
Antenna Characteristics
UWB Antennas
Physical dimension
Compact, Low profile
Operating Frequency Band
GHz
Return Loss
≤ 10 dB
VSWR
≤ 2.0
Input Impedance
50 Ω
Gain
≥ 3 dBi
Efficiency
≥ 70%
Polarization
Linear
Radiation Pattern
Omni-directional
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11. Antenna Geometry & Design
Bottom View
Top View
Total View
Side View W L wP Ln L1 L2 L3 wn l h w1
21.44 mm
23.53
2.11 4
8.66
7.52
9.30
8.244
7.24
1.6mm
1.98
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12. Design Tools
The proposed antenna have been predicted and optimized using a frequency domain three-dimensional full wave electromagnetic field solver (Ansoft HFSS) and Computer Simulation Technology (CST) .
Operating frequency: GHz.
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13. Printed antenna and Measurement Technique
The antenna is printed and measured in UKM lab, Malaysia.
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14. Results: Effect of patch shape over UWB
Above figure shows the different patch shape starting with proposed one. We have fed the rectangular slotted patch with a 50 Ohm transmission line. Here, the rectangular slotted patch element applied as the microstrip termination line which gives more wideband performance compared to the other ones.
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15. Results: Effect of ground over UWB
Figure represents the reflection co-efficient (s11) of the proposed antenna with and without ground plane. We can see that by using tapered slot ground we are able to gain ultra wideband frequency.
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16. Results: Reflection Co-efficient
The reflection coefficient of the proposed antenna is shown in above figure. From the curves, it is clearly seen that the proposed antenna has bandwidth of 109.8% (10 dB return loss) which ranges 3.49 – 12 GHz, which covers the UWB frequencies.
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17. Simulated Peak Gain & Efficiency
Maximum gain is 5.4 dBi
Average gain is 4.2 dBi
Maximum efficiency is 98.3%
Average efficiency is 92.7%
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18. Simulated 2D Radiation Pattern
3.5 GHz
6.5 GHz
9.5 GHz
E-Plane
Omnidirectional
Omnidirectional
Omnidirectional
Omnidirectional
H-Plane
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19. Acquired Result Overview
Antenna Characteristics
UWB Antennas
Physical dimension
21.44 × mm2
Operating Frequency Band
GHz
Return Loss
≤ 10 dB
VSWR
≤ 2.0
Input Impedance
50 Ω
Gain
≥ 4.2 dBi
Efficiency
≥ 92.7%
Polarization
Linear
Radiation Pattern
Omni-directional
ICISET-2016

20. Conclusion
A compact rectangular slotted patch with tapered shaped ground microstrip antenna for UWB technology is presented.
Results of a wideband patch antenna covering 3.49 to 12 GHz frequency have been presented.
Feeding technique, the optimized shape of the patch slots made it possible to significantly improved bandwidth of 109.8% at 10 dB return loss.
Low profile characteristics and smaller in size of copper sheet have been used for easier fabrication.
The radiation mechanism of the proposed antenna is analyzed, and results are also provided.
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21. References
K. Kikuta and A. Hirose, "Compact Folded-Fin Tapered Slot Antenna for UWB Applications," IEEE Antennas and Wireless Propagation Letters, vol. 14, pp , 2015.
A. Dastranj, A. Imani, and M. Naser-Moghaddasi, "Printed wide-slot antenna for wideband applications," IEEE Transactions on Antennas and Propagation, vol. 56, pp , 2008.
M. Mahmud, S. Kibria, M. Samsuzzaman, N. Misran, and M. Islam, "A New High Performance Hibiscus Petal Pattern Monopole Antenna for UWB Applications," Applied Computational Electromagnetics Society Journal, vol. 31, 2016.
R. Azim, M. T. Islam, and N. Misran, "Microstrip line-fed printed planar monopole antenna for UWB applications," Arabian Journal for Science and Engineering, vol. 38, pp , 2013.
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22. Thank You