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1、AnalysisandDesignofANovelSmallMicrostripPatchAntennaABSTRACT:Microstripantennashavebeenwidelyusedincommunicationsystems.DesignandanalysisofawidebandU-shapedparasiticMicrostripPatchAntennawhichiscoupledbythemainpatchandU-shapedparasiticpatchesispresentedinthispaper.Twoparasiticelementsareincorpor
2、atedintotheradiatingedgesofarectangularpatchwhoselengthandwidthareand,respectively,inordertoachievewidebandwidthwithrelativelysmallsize.Theproposedantennaisdesignedandfabricatedonasmallsizegroundplane()forapplicationofcompacttransceivers.Themeasuredbandwidthis1.5GHz(4.78–6.28GHz)withtwoseparater
3、esonantfrequenciesat5.12and6.08GHz.Themeasuredradiationpatternsaresimilartothoseofaconventionalpatchantennawithslightlyhighergainsof6.4dBand5.2dBateachresonantfrequency.KEYWORD:Parasiticpatchantenna,U-shapedparasiticpatches,widebandwidth.1.INTRODUCTIONInhigh-performanceaircraft,spacecraft,satell
4、ite,andmissileapplications,wheresize,weight,cost,performance,easeofinstallation,andaerodynamicprofileareconstraints,low-profileantennasmayberequired.Presentlytherearemanyothergovernmentandcommercialapplications,suchasmobileradioandwirelesscommunications,thathavesimilarspecifications.Tomeettheser
5、equirements,microstripantennas[1]–[38]canbeused.Theseantennasarelowprofile,conformabletoplanarandnonplanarsurfaces,simpleandinexpensivetomanufactureusingmodernprinted-circuittechnology,mechanicallyrobustwhenmountedonrigidsurfaces,compatiblewithMMICdesigns,andwhentheparticularpatchshapeandmodeare
6、selected,theyareveryversatileintermsofresonantfrequency,polarization,pattern,andimpedance.Inaddition,byaddingloadsbetweenthepatchandthegroundplane,suchaspinsandvaractordiodes,adaptiveelementswithvariableresonantfrequency,impedance,polarization,andpatterncanbedesigned[18],[39]–[44].Demandforcompa
7、ctandmultifunctionalwirelesscommunicationsystemshasspurredthedevelopmentofmultibandandwidebandantennaswithsmallsize.Microstrippatchantennasarewidelyusedinthisregardastheyoffercompactness,alowprofile,lightweight,andeconomical
