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DESIGN A HAT SHAPED FOLDED PATCH ANTENNA FOR ADVANCED WIRELESS COMMUNICATIONPresented by:- Mukesh KumarM.Tech final yearMicrowave Engg.

Guide:- Mr. Deepak KumarAssistant ProfessorSRMS CET BareillyOutline Introduction Abstract of Base PaperBasic Principles of Patch antenna Geometry of the Proposed Antenna Antenna Configuration Antenna Performance ParameterMiniaturization and beam width enhancement ProcedureAdvantages Applications Conclusion2IntroductionMicrostrip antenna is a very thin metallic strip, placed a small fraction of a wavelength above a ground plane , separated by a dielectric.

Patch antennas are low cost, Size , weight have a low profile and are easily fabricated and installation.Abstract of Base PaperMiniaturization and beam width enhancementSize of the patch antenna is reduced 44.8%Measured half power beam width of 124 Degree is achievedImpedance bandwidth of the antenna is over 10%The 3-dB axial ratio bandwidth is 3.05%Proposed antenna covers a wide elevation angle and complete azimuth range.PolarizationThe direction of the eclectic field/vector of the EM wave produced by antenna .It is three types1-Linear Polarization 2-Elliptical Polarization3-Circular Polarization

Basic Principles of Patch AntennaThe patch acts approximately as a resonant cavityIn a cavity, only certain modes are allowed to exist, at different resonance frequencies. If the antenna is excited at a resonance frequency, a strong field is set up inside the cavity, and a strong current on the surface of the patch. 6Overview of Microstrip Antennas7Common ShapesRectangularSquareCircularEllipticalAnnular ringTriangularxyhar8Overview of Circular Patch Antennas4. The location of the feed determines the direction of current flow.3. Circular Patch2. Dielectric Substrate1. Grand plane Folded Patch with 8 Slots

(a) circular patch (b) Folded patch(c) Folded patch with 4 slots and (d) Folded patch with 8 slots.Geometry of the Proposed Antenna

Antenna ConfigurationIncluding folding Cutting slot on a patch is composed of a slotted hat shape patch,A double sided printed-circuit-board (PCB), A metallic block and a dielectric substrate surround. Prototype of the proposed antenna(a) Top View. (b) Bottom View.

Antenna Performance ParameterVSWRAxial RatioGainRadiation patternImpedance bandwidthCircular PolarizationRadiation intensity

VSWR and Axial Ratio

Gain Against Frequency

Radiation patternNormalized radiation pattern at 3.77 GHz .Fig (a) Measured (b) Simulation

Azimuth Range Cover by Antenna

Minimization Procedure of Antenna Design(A) Folded the edge of patch and slot loaded

Fig Impedance of antenna with different patch shape (a) Resistance (b) ReactanceMinimization Procedure of Antenna Design Cont(B) Different Value of Dielectric substrate

Generally, a dielectric substrate with high permittivity is loading under a patch to reduce the size of a patch antenna. High dielectric substrate placed below the patch will narrow the bandwidth, although the size of the antenna can be reduced.Beam width Enhancement of Antenna Design(A) Thickness Change of Dielectric Substrate Material

Fig(a) Axial Ratio Against frequency (b) Gain Again Theta Beam width Enhancement of Antenna Design Cont(B) Change Height of Metallic Block

Fig (a) axial ratio against frequency (b) gain against thetaHalf power beam width with different value of H 1 and H 2

Dielectric Substrate H 1Metallic Block H 2CharacteristicBase paper resultGain5 dBicBandwidth3.05%Axial Ratio3 dBVSWR< 1.5Resonant frequency3.77GHzBase Paper Results 5/14/2015SRMSCET,Bareilly23Azimuth range0-360 DegreeDesign SpecificationPARAMETERBASE PAPER SPECIFICATIONFUTURE WORK SPECIFICATIONShape of PatchCircular FoldedCircular Folded

Slots are loaded8 Nos12 or 16 NosAdjacent slot angle45 30 or 22.5 Material for dielectric substrateArlon (r = 2.65)Polystyrene(r = 2.60)Resonant frequency

3.77 GHzFor S-Band

Metallic block height20mm10mmThickness of dielectric substrate4.5 mm6mm5/14/2015SRMSCET,Bareilly24AdvantagesTo suit for portable handsetTo provide good coverage and high qualityTwo-way voice ,message and even data communicationsThe existing terrestrial network fully cover all remote areasEasy to fabricate (use etching and photolithography)Easy to feed (coaxial cable, microstrip line, etc.)Easy to use in an array or incorporate with other microstrip circuit elements

5/14/2015 9:15 AMApplications

ConclusionA compact circular polarized patch antenna with wide beam width for handheld device for advance advanced wireless application use in handsetA procedure of miniaturization and beamwidth enhancement for the proposed CP antenna is able to cover wide elevation angles and the complete azimuth range (0-360 degree).5/14/2015SRMSCET,Bareilly27References[1]K.A. Ming Mak , H.A.U. Wah Lai, Kwai Man Luk,And Chi Hou Chan ``Circularly Polarized Patch Antenna for Future 5G Mobile Phones'' Received November 17, 2014, accepted December 4, 2014, date of publication December 18, 2014, date of current version January 2,2015.[2] H. W. Lai, K. M. Mak, and K. F. Chan, ``Novel aperture-coupled microstrip-line feed for circularly polarized patch antenna,'' Prog. Electromagn. Res., vol. 144, pp. 19, Jan. 2014.[3] C. W. Su, S. K. Huang, and C. H. Lee, ``CP microstrip antenna with wide beamwidth for GPS band application,'' Electron. Lett., vol. 43, no. 20, pp. 10621063, Sep. 2007.[4] W.-S. Chen, C.-K. Wu, and K.-L. Wong, ``Single-feed square-ring microstrip antenna with truncated corners for compact circular polarisationoperation,'' Electron. Lett., vol. 34, no. 11, pp. 10451047, May 1998.[5] A. Al-Shaheen, ``Beamwidth enhancement of L1 and L5 of global positioning system (GPS) antenna,'' J. Eng. Appl. Sci., vol. 6, no. 8, pp. 1521, Aug. 2011.5/14/2015 9:15 AMTHANK YOU.5/14/2015SRMSCET,Bareilly29