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1、万方数据AbstractIIIAbstractRecentyears,theultra-widebandwirelesstechnologyhasbeenwidelyusedinradar，wirelesscommunicationandastronomy.Slotantennas,workingasoneofthekeycomponents,havewonincreasingfavorbyengineersbecauseoftheirsimplestructures,lowprofilesandlow
2、cost.Meanwhile,howtorealizeultra-widebanddirectionalradiationwithapairofantennahasbecomethehotspotanddifficultyinresearch.Inthispaper,weproposedanultra-widebandslotantennawithmultiplateback-reflector.Atthesametime,basedondifferentialevolution(DE)algorith
3、m,themultiplateback-reflectorisoptimized.Themajorworksandcontributionsofthisdissertationareoutlinedasfollows:1.Anultra-widebandslotantennaisdesigned.Inthisdissertation,anultra-widebandslotantennacoveringthecommonlyusedcommercialfrequencybandsisfirstdesig
4、ned.Acrossjunctionmicrostrip-to-slotlinetransitionisproposed,withaunequal-section-lengthmulti-sectionmatchingtransformerisalsousedtoreducethereflectiononthefeed-lineinordertoachievebroadbandperformance.Atthesametime,apairofdiscpatchesisemployedtoenhancet
5、heslotantenna’simpedancebandwidth.Themeasuredimpedancebandwidthis1.56GHz-3.05GHz(65%).2.Anovelmultiplateback-reflectorisproposed.Toovercometheunidirectionalradiationantennadesignproblemsinultra-wideband,weproposeanovelreflectorcalledmultiplateback-reflec
6、tor.Thisnovelreflectordividedaconventionalreflectorintoseveralportionsofsmallerreflectorsandthedistancesbetweeneachreflectorandslotantennaaredesigneddifferentforin-phasesuperpositionbetweentheincidentwaveandreflectedwaveinbroadband.Themeasuredimpedanceba
7、ndwidthis1.37GHz-3.21GHz(80.3%).Themeasuredgaincanbeupto9.3dBandF/Bratioishigherthan17dB.Moreover,thisreflectorhasindustrialapplicationvalueforitssimplestructure,lowcostandgoodperformance.3.DEalgorithmtooptimizethemultiplateback-reflectorisstudied.Byusin
8、gDEalgorithm,theareaofthereflectorsandtheirdistancefromtheslotantennaare万方数据IV宽频带缝隙天线的多级反射板优化设计optimizedtoachievestablegainandhighF/Bratio,andthebandwidthisconsideredaswell.Theexperimentsresultsshowthatimpedancebandwidthis
