Post on 13-Jan-2017
A Wideband Printed Antenna With Band-notched InterferenceBlocking Characteristic
FYP Thesis Presentation (Semester 2: 2015/2016)
Presented By : Kyaw Soe Hein (A0103612)
Project Code: SDEE_1510_XXX
Presentation Outline
Good Evening !Objective of the ProjectParametric Studies Design Simulations Finalized Antenna DesignFabrication & MeasurementConclusion
2.4GHz Patch Antenna
Objective of the Project
Authorized UWB Operating Band (FCC)Communications & Field Disturbance Sensors3.1GHz-10.6GHz
UWB Definition Impedance BW (-10dB) > 500MHzFractional Bandwidth > 20% or 25%
Band Rejection by U-slotWLAN (5-6 GHz)
“Omnidirectional Radiation Pattern in E&H plane”“Good Gain over the interested Frequency Band”
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.
Microstrip UWB AntennaProposed Antenna Design
5. Substrate Dimension
2. Patch Length1. Feed Line
4. Entry Width (W1)
3. Elliptical Bell Shape
6. Ground Patch
Microstrip UWB Antenna
Proposed Band Notch (U-slot)
7. Width of Slot
8. Length of Slot
9. Etched of Slot
10. Distance from Edge
Parametric StudiesSubstrate 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 ProcessDesign without Notch (UWB Requirements)
(Parametric Study on Critical Parameters)
followed by adding in U-slot Feature (Band Rejection)
Microstrip Impedance Matching
Microstrip Impedance Matching
Hand Calculation Shows: Wo = 2 mm >>> Zo = 42.8 ohm (3GHz)Wo = 2 mm >>> Zo = 44.43 ohm (11GHz)
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.
Parametric Studies Ground Patch Length .
Lg
Parametric StudiesEntry Width
Parametric StudiesElliptical Shape
Parametric StudiesSubstrate Dimension
Width: original 34mm reduced to 28mm
Parametric StudiesU- Slot parametric Study
Finalized Antenna Design
Simulation: Return Loss
3 D Radiation Plots
11GHz9GHz
7GHz
5 GHz
3GHz
Fabricated Antennae
With U-slot NotchWithout Notch
S11 (VSWR) & Radiation Pattern S11 (VSWR)
Experimental Measurement: S11
Both Fabricated Antennae achieved S11 Requirement !
Radiation Pattern Measurement
H Plane(XOZ)
E1 Plane (XOY)
E2 Plane (YOZ)
H Plane Radiation Pattern (XOZ)
E1 Plane Radiation Pattern (XOY)
E2 Plane Radiation Pattern (YOZ)
Project AchievementsExperimental Result3.6 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 MeasurementSimulation : 4.8-6GHzMeasurement: 6.2-7.6GHz
Discussion & RecommendationReference Paper fractional bandwidth can achieve 112% (3.2 to 11.4 GHz) Operating BW: 8.2GHzNo 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: 9GHzPreliminary U Slot Investigation (with hardware experiment)Substrate Rogers 04003C (0.82 mm)
Conclusion
UWB Requirements Achieved Promising candidates for UWB communicationsSatisfied Impedance Bandwidth and Return LossOmni-directional radiation patterns
Thank you very much for the enriching experience and knowledge passed on to me during my time in NUS !!
KYAW SOE HEINA0103612Y