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