Please use this identifier to cite or link to this item: https://idr.nitk.ac.in/jspui/handle/123456789/17044
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dc.contributor.advisorKrishnamoorthy, K.-
dc.contributor.authorR, Karthik.-
dc.date.accessioned2022-01-29T14:19:13Z-
dc.date.available2022-01-29T14:19:13Z-
dc.date.issued2021-
dc.identifier.urihttp://idr.nitk.ac.in/jspui/handle/123456789/17044-
dc.description.abstractThis thesisdealswiththeeffectivedesignofplanarleakywaveantennas(LWA)for novelfunctionalities.Theworkdescribesamethodologybasedonsingle-layertrans- mission basedGoubaulineandinvestigationofasymmetryinHalf-modesubstratein- tegratedwaveguide(HMSIW)periodicLWAstoaddressverydifferentantennaconfig- urations. FournovelLWAsareproposedtoachievewideanglebeamscanning,single layer basedEnd-Fireradiation,dual-bandandsimultaneousdual-beamscanningfunc- tionalities. WidebeamscanningisdesignedusingGoubauline.Incontrasttotheconventional LWAwithasmallscanninganglerangeandlowefficiency,thisworkemployedape- riodically bendingGoubauline,whichnotonlybringsinaperiodicperturbationfor leakywaveradiation,butalsoenhancesthescanningrangeduetotheincreaseddelay for eachlineelement.Theproposedantennafeaturesgoodradiationperformanceand has acompactandlowprofileconfiguration.Also,asimpleandlow-profilePlanar Goubau linebasedEndfireantennaisdesigned.Endfireradiationisachievedbymod- ifying theGoubaulineintoinvertedperiodicarrangementofV-shapedunitcells.The proposed endfireantennahasasinglemetalliclayerwithasimpleconfigurationwhich is easytofabricateandalsoeasytointegratewithotherelectronicscircuits. Most oftheexistingLWAsaregenerallydesignedforasinglebandapplication.In this work,byetchingsimplespiraltypeslotsontheHMSIWcavity,anoveldual-band dual-polarized LWAisdesigned.Theantennaradiatesthelinearlypolarized(LP)wave in thelowerbandandcircularlypolarizedwaveinthehigheroperatingband.Inthe higher operatingbandantennaexhibitsbothright-handcircularpolarization(RHCP) as wellasthelefthand(LHCP)circularpolarizationinthenearmainbeamdirection. Also, asymmetryisinvestigatedinHMSIWLWA.Basedonasymmetry,twodifferent configurations ofdual-bandLWAsaredesigned.ThefirstconfigurationradiatesLP v wavesinthelowerbandandCPwavesintheupperbandwhentheunitcellsarecas- caded sequentially.Thesecondconfiguration,wherethesidewallviaoftheHMSIW unit cellsareconnectedalternatingly,providessimultaneousdual-beamswithdiffer- ent polarizationintheupperoperationalbandinadditiontotheLPbeaminthelower operational band.ThesenovelfunctionalitiesofLWAcanbeeffectivelyusedformulti- objectivetrackingapplicationsandforenhancingthechannelcapacityofautomotive and satellite-basedwirelesscommunicationsystems.Sincebothantennaconfigurations had dualfrequencybandswithdifferentpointingdirectionsinscanning,itcanalsobe useful forvehicularapplicationstotrackdifferentobjectsinitsnearbylocations Proposed designsarefabricatedusingLPKFprotomatmachineS103andexperi- mentally verifiedusingradiationpatternmeasurementset-up.Impedancebandwidth, peak gain,axialratiobandwidthandradiationefficiencyaremeasuredandcompared with thesimulatedresults.Theperformanceoftheproposedworksarecomparedwith the previousliterature.en_US
dc.language.isoenen_US
dc.publisherNational Institute of Technology Karnataka, Surathkalen_US
dc.subjectDepartment of Electronics and Communication Engineeringen_US
dc.subjectLeaky Wave Antennaen_US
dc.subjectGoubau Lineen_US
dc.subjectCircular Polarizationen_US
dc.subjectHalf Mode Substrate Integrated Waveguideen_US
dc.titleDesign and Analysis of Leakywave Antennas for Novel Functionalitiesen_US
dc.typeThesisen_US
Appears in Collections:1. Ph.D Theses

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