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1、IEEETRANSACTIONSONANTENNASANDPROPAGATION,VOL.48,NO.5,MAY2000777ExperimentalStudyofaMicrostripPatchAntennawithanL-ShapedProbeC.L.Mak,K.M.Luk,SeniorMember,IEEE,K.F.Lee,Fellow,IEEE,andY.L.ChowAbstract—The-shapedprobeisshowntobeanattractivefeedforthethickmicrostripantenna(thic
2、knessaround10%oftheoperatingwavelength).Aparametricstudyontherectangularpatchantennaispresented.Itisfoundthattheantennaattains36%impedancebandwidth(SWR2)aswellasgainband-widthandabout7-dBiaveragegain.Atwo-elementarrayfedby-probesisalsoproposed.Experimentsshowthatthearrayde
3、signcansubstantiallysuppressthecrosspolarizationoftheproposedantenna.Boththeantennashavestableradiationpatternsacrossthepassband.Moreover,themeasuredresonantfrequenciesoftheproposedantennaagreewellwithanexistingformulaandthe-probedoesnothavemucheffectontheresonantfrequency
4、.IndexTerms—Bandwidthwidening,microstrippatchantennas.I.INTRODUCTIONHEinherentlynarrowimpedancebandwidthistheTmajorweaknessofamicrostripantenna.Techniquesforbandwidthenhancementhavebeenintensivelystudiedinpastdecades.Severalmethodsincludingtheutilizationofparasiticpatches[
5、1]andthicksubstrates[2]havebeensuggestedintheliterature.Thestackedgeometryresultingfromtheadditionofparasiticpatcheswillenlargethesizeandincreasethecomplexityinarrayfabrication,whichisespeciallyinconve-nientforthecoplanarcase[3].Thetechniqueofemployingathickersubstrateinth
6、ecoaxiallyfedmethodwillnotonlycauseahighlevelofcrosspolarizationinthe-plane,butalsolimittheachievablebandwidthtolessthan10%oftheresonantfrequencyduetotheincreasedinductanceintroducedbythelongerproberequired.Itisfoundthatthecapacitanceintroducedbyetchingasmallcircularsloton
7、thepatchcancanceloutaportionoftheprobeinductance[4],sothata16%bandwidthcanbeachieved.ByetchingaU-shapedslot[5],theFig.1.BasicgeometryoftheL-shapedprobefedpatchantennaandthecoordinatesystem.bandwidthcanbesubstantiallyincreased,typicallytolargerthan30%.Anothermethodtocompens
8、atetheprobeinductanceisthecapacitivefeedingtechnique[6].Asmallcapacitorthe-probehasbeenap
