平面倒f天线的理论与实例-喻志远new

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1、PIFA:PIFA:PlanarPlanarInvertedInverted--FAntennaFAntenna平面倒平面倒FF天线天线平面倒平面倒FF天线的理论与实例天线的理论与实例喻志远电子科技大学2006.2.20小天线的主要类型小天线的主要类型11。。MicrostripMicrostripAntenna(MSAAntenna(MSA))微带天线微带天线22。。PIFAPIFA：平面倒：平面倒FF天线天线33。。ILIL：：倒倒LL天线天线44。。MonopoleMonopoleMicrostripMi

2、crostripAntennaAntenna单极微单极微带天线带天线以上天线都具有低剖面(Low-Profile)特点主要小天线的带宽主要小天线的带宽ChuChu--LimitLimit一定天线体积与天线一定天线体积与天线相对带宽的关系相对带宽的关系现代移动通信对天线的基本要求现代移动通信对天线的基本要求现代通信面临的挑战#SignalReliability#Minimizesignalloss#Combatmultipathfadingeffects#Powerrequirements#Miniaturization:L

3、owProfile#Datarates#Frequencyutilization微带天线微带天线MSAMSA1。Thelengthofthepatch(L)istypicallyaboutathirdtoahalfofafree-spacewavelength(λο),.2。Thedielectricthicknessisintherangeof0.003λοto0.5λο.3。Acommonlyuseddielectricforsuchantennasispolytetrafluoralethylene(PTFE),whic

4、hhasarelativedielectricconstantofabout2.5.polytetrafluoralethylene聚四氟乙烯MSAMSA特点特点1.Theyarelow-profileantennas.2.Theyareeasilyconformabletononplanarsurfaces.Alongwiththeirlowprofilethismakesthemwellsuitedforuseonhigh-performanceairframes.3.Theyareeasyandinexpens

5、ivetomanufactureinlargequantitiesusingmodernprinted-circuittechniques.4.Whenmountedtoarigidsurfacetheyaremechanicallyrobust.5.Theyareversatileelementsinthesensethattheycanbedesignedtoproduceawhilevarietyofpatternsandpolarizations,dependingonthemodeexcitedandthe

6、particularshapeofpatchused.6.Adaptiveelementscanbemadebysimplyaddinganappropriatelyplacedpinbetweenthepatchandthegroundplane.Usingsuchloadedelements,theantennacharacteristicscanbecontrolled.分析模型分析模型TransmissionLineModelforMicrostripAntennasCavityModelforMicrostr

7、ipAntennasMSAMSA的的QQ值与基片的相对介电常值与基片的相对介电常数介质的关系数介质的关系一些天线的一些天线的QQ值值PIFAPIFA天线的背景天线的背景现代移动通信对天线的要求主要为以下几方面：1。小尺寸。(Compactinsize)2。轻重量。(LightinWeight)3。与设备共形。(Conformitywithstructure)4。全向辐射。(Omni-Directional)5。多频带工作。(Multi-BandOperation)6。低造价。(LowFabricationCost

8、)PIFAPIFA的特点的特点AdvantagesThePIFAhasmanyadvantages：easyfabrication,lowmanufacturingcost,andsimplestructure.DisadvantagesButthemajord