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1、摘要隨著現(xiàn)有定位系統(tǒng)的發(fā)展,寬波束圓極化天線成為當前的研究熱點.寬波束圓極化天線形式多樣,但一直不能很好的解決多天線組合應(yīng)用中的電性能問題,本文的方案較好的解決了這一問題,在各個性能指標之間實現(xiàn)了較好的權(quán)衡。本文首先對幾種GPS天線形式作了基本理論的分析。分別分析了高次模微帶天線、介質(zhì)諧振微帶天線及Sinuous天線的結(jié)構(gòu)特點和性能優(yōu)點,并給出了一個初步的設(shè)計方法。同時,對這幾種天線形式采用有限元法進行計算,得出了較好的仿真結(jié)果,并研究了不同結(jié)構(gòu)對天線性能參數(shù)的影響,為多頻天線的設(shè)計提供了理論基礎(chǔ)。對高次模天線進行了實際加工和測試,測試結(jié)果與仿真結(jié)果有較好的一致性。其次,在分析了
2、幾種高性能寬波束圓極化天線的基礎(chǔ)上,提出了兩種實現(xiàn)多頻點工作的天線方案。一種是采用兩個高次模天線分別實現(xiàn)中頻和高頻性能要求,而采用簡單的四臂螺旋天線實現(xiàn)低頻要求。另一種采用共面介質(zhì)微帶型Sinuous天線實現(xiàn)多頻點工作,滿足寬波束圓極化特性要求。本文給出了相關(guān)的理論計算結(jié)果和部分測試結(jié)果,并對其可行性及其中可能存在的難點問題作了比較分析。相關(guān)結(jié)果表明,文中方案有很好的工程應(yīng)用前景。關(guān)鍵詞:寬波束圓極化天線TM:.高次模微帶天線正弦天線微帶介質(zhì)天線Abstract11.1——————————————————————————————————————————一Asthedevelopm
3、entofsatellitepositioningsystems,moreresearchesonwide.beamcircularlypolarizationantennasaredone.ThemutualdegradationandshieldingeffectscouldnotbesolvedwellamongthecombinationofseveralantennawithkindsofantennaforGPS.Theproblemsaresolvedwiththeschemesintroducedinthispaper.Firstofall。baSictheori
4、esofformsofGPSantennaaregiven.Characteristicsofstructureandperformanceadvantagesofhigh-ordermodemicrostripantenna,microstripantennaandSinuousdielectricantennaarepresentedandanalyzed,andthensomestructureadvantagesareutilized,andsomenewstructuresareadvanced.Andme孤nime,withtheFEM,thoseantennasar
5、esimulated,andbetterresultsareobtained.Thehigh.ordermodeantennawasprocessed,andthetestresultsaccordingwiththesimulatiOllS.Secondly,recordingtotherequirementsofmulti—frequency,twokindsofantennacombinationsareintroduced,whichcouldreducethemutualdegradationandshieldingeffects.Oneiscomposedoftwoh
6、igh—ordermodemicrostripantennasandasimplefour-annspiralantenna,whichcouldsatisfywithdifferentradiationdemandsoftransmitterandreceiver.Anotherusedthecoplanarsinuousantennawhichcallachievegoodcircularpolarizationrequirementsonallthreefrequencies·Inthispaper,relevanttheoreticalcalculationandanal
7、ysisofresultsaregivensubsequently.Alsotwoschemesofmulti—frequencyantennasareadvancedandcomparedwitheachother.Itisavailableforthisdesignmethodtobeappliedinengineering.Keywords:widebeamcircularlypolarizedantennahigh‘ordermodemicrostripantennaSi