These slides are presented for my final year project. It is designed by HFSS and fabricated hardware for experimental measurement of S11 and Radiation Pattern Measurement. It is better to download the slides to see all the results presented as I put in animations.

1. A Wideband Printed Antenna With
Band-notched Interference
Blocking Characteristic
FYP Thesis Presentation (Semester 2: 2015/2016)
Presented By : Kyaw Soe Hein (A0103612)
Project Code: SDEE_1510_XXX

2. Presentation Outline
Good Evening !
Objective of the Project
Parametric Studies
Design Simulations
Finalized Antenna Design
Fabrication & Measurement
Conclusion
2.4GHz Patch Antenna

3. Objective of the Project
Authorized UWB Operating Band (FCC)
Communications & Field Disturbance Sensors
3.1GHz-10.6GHz
UWB Definition
Impedance BW (-10dB) > 500MHz
Fractional Bandwidth > 20% or 25%
Band Rejection by U-slot
WLAN (5-6 GHz)
“Omnidirectional Radiation Pattern in E&H plane”
“Good Gain over the interested Frequency Band”

4. Literature Reference Work
“A Novel Printed Monopole Antenna For Future Ultra-
Wideband Communication System” by Osama M. H. Ahmed
and Abdel-Razik Sebak.
Experimental Result: 3.2 – 11.4 GHz, fractional BW 112% with
Return Loss S11 < -10dB
1.57-mm thick Rogers RT-5880 substrate
Er = 2.2 with Overall Size, L x W = 30 x 34 (mm)
Reference paper: Only Band rejection U-slot
feature is simulated, but Not validated with hardware.

5. Microstrip UWB Antenna
Proposed Antenna Design
5. Substrate Dimension
2. Patch Length1. Feed Line
4. Entry Width (W1)
3. Elliptical Bell Shape
6. Ground Patch

6. Microstrip UWB Antenna
Proposed Band Notch (U-slot)
7. Width of Slot
8. Length of Slot
9. Etched of Slot
10. Distance from Edge

7. Parametric Studies
Substrate Availability
“Rogers R04003C material” with a relative permittivity Er = 3.55
and a thickness of “0.813 mm” with loss tangent of 0.0027.
Design Process
Design without Notch (UWB Requirements)
(Parametric Study on
Critical Parameters)
followed by adding in U-slot Feature (Band Rejection)

8. Microstrip Impedance Matching

9. Microstrip Impedance Matching
Hand Calculation Shows:
Wo = 2 mm >>> Zo = 42.8 ohm (3GHz)
Wo = 2 mm >>> Zo = 44.43 ohm (11GHz)

10. Parametric Studies
Microstrip Feed Line Width
W_feed = 2 mm
Frequency Region (10.8 – 11.0 GHz)
could be off-tolerance during
Measurement for 1.5 mm.

11. Parametric Studies
Ground Patch Length .
Lg

12. Parametric Studies
Entry Width

13. Parametric Studies
Elliptical Shape

14. Parametric Studies
Substrate Dimension
Width: original 34mm reduced to 28mmWidth: original 34mm reduced to 28mm

15. Parametric Studies
U- Slot parametric Study

16. Finalized Antenna Design

17. Simulation: Return Loss

18. 3 D Radiation Plots
11GHz
9GHz
7GHz
5 GHz
3GHz

19. Fabricated Antennae
With U-slot NotchWithout Notch
S11 (VSWR) & Radiation Pattern S11 (VSWR)

20. Experimental Measurement: S11
Both Fabricated Antennae achieved
S11 Requirement !
Both Fabricated Antennae achieved
S11 Requirement !

21. Radiation Pattern Measurement
H Plane(XOZ)
E1 Plane
(XOY)
E2 Plane
(YOZ)

22. H Plane Radiation Pattern (XOZ)

23. E1 Plane Radiation Pattern (XOY)

24. E2 Plane Radiation Pattern (YOZ)

25. Project Achievements
Experimental Result
3.6 GHz to 12.6 GHz with impedance bandwidth of (S11 < -10dB)
Fractional BW : 111%
Measured radiation patterns show close agreement with
Simulation
“Omni directional Radiation Pattern in H & E plane”
U-slot’s band rejection Measurement
Simulation : 4.8-6GHz
Measurement: 6.2-7.6GHz

26. Discussion & Recommendation
Reference Paper
fractional bandwidth can achieve 112% (3.2 to 11.4 GHz)
Operating BW: 8.2GHz
No U Slot validation (without hardware experiment)
Substrate Rogers RT 5880 (1.57mm)
Student’s Project
fractional bandwidth of 111% (3.6 to 12.6 GHz)
Operating BW: 9GHz
Preliminary U Slot Investigation (with hardware experiment)
Substrate Rogers 04003C (0.82 mm)

27. Conclusion
UWB Requirements Achieved
Promising candidates for UWB communications
Satisfied Impedance Bandwidth and Return Loss
Omni-directional radiation patterns
Thank you very much for the enriching experience and
knowledge passed on to me during my time in NUS !!
KYAW SOE HEIN
A0103612Y