DESIGN AND SIMULATION OF A TRIPPLE BAND-NOTCHED MICROSTRIP ANTENNA FOR ULTRA WIDEBAND APPLICATIONS

Antenna design

1. DESIGN AND SIMULATION OF A TRIPPLE
BAND-NOTCHED MICROSTRIP ANTENNA
FOR ULTRA WIDEBAND APPLICATIONS
OLAOLUWA AYODEJI ADEGBOYE
(B. Eng., Malaysia)
17/PG/EG/EE/012
SUPERVISORS
DR. KUFRE M. UDOFIA
DR. A. B. OBOT
June 23, 2021
1

2. OUTLINE OF PRESENTATION

Introduction

Background of the Study

Statement of Problem

Objectives of the Study

Significance of the Study

Scope and Limitations of the Study

Review of Related Works

Materials and Methods
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3. OUTLINE OF PRESENTATION

Results and Discussion

Summary

Engineering Implications of Findings

Contribution to Knowledge

Recommendations

Suggestion for Further Studies

Conclusion
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4. Background of the Study
In the past few years Ultra wideband (UWB)
technology has received increasing attention in
the communication system.
The FCC has mandated that UWB radio
transmissions can legally operate in the range
from 3.1 GHz up to 10.6 GHz
Its main envisioned advantages over conventional
(narrowband) wireless communications systems
are: low transmit power levels, high-data rates,
and possibly simpler hardware configurations
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5. Background of the Study Continued

What is an Antenna? What is UWB?

Wireless communication

a lot of data,

very far,

very fast,

for many users,

all at once.

Approved spectrum by FCC

Communication, medical imaging and measurement systems (3.1 GHz -10.6
GHz)

Ground penetrating radar (<960 MHz) and wall imaging (3.1 GHz -10.6 GHz)

Thru-wall imaging and surveillance system (1.99 GHz -10.6 GHz)

Vehicular radar system (22-29 GHz)
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6. Background of the Study
Continued
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7. Statement of the Problem

Interference in Indoor
Environment

Size

Broadband Capabilities
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8. Objectives of the Study

Design a UWB antenna with triple band-
notched characteristics

Investigate the performance of the UWB
antenna using CST microwave Studio

Fabricate a UWB antenna with tband-notched
characteristics, and

Test the performance of the antenna
experimentally.
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9. Significance of Study

Large Bandwidth without fear of
interference

Easy integration with miniaturized
devices and IOT Devices
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10. Scope of the Study

Circular Microstrip Patch Antenna

UWB frequency range for Communication

Computer Simulation Technology

FR4 Substrate

Coaxial feed

Vector Network Analyzer
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11. Limitations of the Study

Short-Range Communication

Soldering Lead and antenna
efficiency

International License of Softwares
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12. UWB Antenna Parameters

Impedance Bandwidth

Return Loss

Voltage Wave Standing Ratio

Radiation Pattern

Directivity

Efficiency

Gain

Current Distribution
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13. UWB Antenna Standards
Parameter Standard
VSWR Bandwidth 3.1 – 10.6 GHz
Radiation Efficiency High (>70%)
Phase Nearly linear; constant group delay
Radiation Pattern Omni directional
Directivity and Gain Low
Half Power Beamwidth Wide(> 60 °)
Physical Profile Small, Compact, Planar
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14. Structure of a Simple CMPA
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15. Impedance Matching
Technique
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16. Review of Related
Literatures
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Band notch UWB antennas Antenna
Area
Operating Frequency Notched band
1 Ultrawideband rectangular aperture antenna
(Lin and Hung, 2006)
1225mm
2
3.1 GHz -10.6 GHz 5 - 6 GHz
2 Compact printed antenna using inverted L-slit
(Yoon et al, 2012)
1080mm
2
3.1 GHz -10.6 GHz 4.85 - 6.04 GHz
3 Compact Dual-band and Tri-band Microstrip
Patch Antennas (Dhirgham, 2018)
1441mm
2
3.1 GHz -10.6 GHz Multiband
4 Tri-band Microstrip Antenna for Targetting 5g
Broadband Communications
Firdausi (2018)
1750 mm
2 40 GHz to 70 GHz  
40 GHz to 70 GHz
5 Design of Ultra Wideband Circular Patch
Monopole Antenna (Saket and Niwaria, 2015)
1240 mm
2
1.7 GHz to 14 GHz Multiband
6 Proposed 1100mm
2
3.1 GHz -10.6 GHz Triple Band
16

17. Flow Chart
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18. Project Methodology
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19. Parameter Evaluation

Step 1: Evaluation of the Radius of Patch

Define lower operating frequency of antenna and calculate patch
radius (R) by using the formula

Step 2: Determine Substrates Dimension

The substrate length is chosen as half wavelength of the lowest
frequency

Step 3: Determine the Feedline Dimension

Calculate the width of the feeding line by using the transmission
line theory

Evaluation of Exponential impedance bandwidth matching
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20. Antenna Parameters
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21. Realised Antenna Structure
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22. RESULTS

Design Results

Simulation Results
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23. Designed Antenna in CST
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24. Current Distribution
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25. Return Loss
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26. Notch Implementation

Band Notched Antenna Design
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26

27. First Notch Band
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Parameter W
1
L
1
n
d
Total Length
Value (mm) 8 mm 7mm 2 mm 28mm
2W
1
+ 2L
1
- n
d
27

28. Return Loss of First Band
Notch
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29. VWSR of First Band Notch
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30. Gain Single Band Notched
Antenna
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31. Triple Band Notch Design
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32. Return Loss of Triple Band
Notched Antenna
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33. VWSR of Triple Band
Notched Antenna
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34. Current Distribution at
different Notch Frequencies
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35. Gain of Three Band Notched
Antenna
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36. Summary of Results
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Parameter Standard Dissertation
Results
VSWR Bandwidth 3.1 – 10.6 GHz 2.7 -11.3 GHz
Radiation Efficiency High (>70%) 86%
Phase Nearly linear; constant
group delay
Constant
Radiation Pattern Omni directional Omni - directional
Directivity and GainLow 3.8dBi
Half Power Beamwidth
Wide
(> 60 °) 70
Physical Profile Small, Compact,
Planar
Small, Compact and
Planar

37. Engineering Implication of
Findings
The method adopted in design of the circular patch and the
impedance matching method adopted has brought to the
for the possibility of notching a UWB antenna without
consequent shift in the frequency band of the other
notches.
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38. Contribution to Knowledge

Design of UWB antenna with triple band notched characteristics
with exponential tapered impedance matching transformer.

Analysis of the effect of slots on the performance of circular
patch antenna.

Design and application of slots on circular patch antenna for
notch characteristics at desired frequencies.
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39. Recommendations

Suitable for application in indoor
environment

Portability of the antenna.

Implementation on PCB

Interference with downlink X-band.
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40. Suggestions for Further Studies

Size of the antenna

Dielectric substrate material

Broadband impedance matching techniques

Numerical modelling simulation software

Foreign collaborations
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41. Conclusion

Finally, an exponential tapered microstrip fed
UWB antenna with triple band - notched
characteristics is presented. Two C – shaped slots
were etched on the radiating patch to obtain band
– notched characteristics for WiMAX (3.5GHz) and
WLAN (5.5GHz) frequencies while a U-shaped slot
is etched on the feedline to obtain band notched
characteristics at Satellite Downlink X – Band
(7.5GHz) frequency. The operates over the
frequency band from 2.8 GHz to 11.2 GHz.
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42. THANK YOU
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