5g微带阵列天线讲解

1、5G微带阵列天线要求：利用介质常数为2.2,厚度为1mm,损耗角为0.0009的介质，设计一个工作在5G的4X4的天线阵列。评分标准：良：带宽7%优：带宽7%且效率大于60%1微带辐射贴片尺寸估算设计微带天线的第一步是选择合适的介质基板,假设介质的介电常数为8,r对于工作频率f的矩形微带天线，可以用下式设计出高效率辐射贴片的宽度W，即为：c8+1、-1w=一()2f2式中，c是光速，辐射贴片的长度一般取为入/2；这里入是介质内的导波波长,即为：考虑到边缘缩短效应后，实际上的辐射单元长度L应为:2AL式中，8e是有效介电常数，AL是等效辐射缝隙长度。它们可以分别用下式计算,即为：8+181-h、

2、1,一+二(1+12)-222w一八(8+0.3)(狡/h+0.264)AL=0.412h-(80.258)(攻/h+0.8)2.单元的仿真由所给要求以及上述公式计算得辐射贴片的长度L=19.15mm,W=23.72mm。采用非辐射边馈电方式,模型如图1所示：图1单元模型此种馈电方式，可以通过移动馈电的位置获得阻抗匹配，设馈电点距离上宽边的偏移量为dx,经仿真得到当dx=4mm时，阻抗匹配最好。另外，之前计算出的尺寸得到的谐振点略有偏移，经过仿真优化后贴片尺寸变为L=19mm,W=23.72mm。仿真结果图如图2，图3所示。图2S11参数图图42X2微带天线阵列a&lnlaG/(da&lnla

3、G/(d-20.00-200.00-150.00-100.00-50.000.0050.00100.00150.00200.00Thetadeg图3增益图从图中可以看出谐振点为5GHz,计算的相对带宽为2.2%,增益为5.78dB。2X2阵列设计设计馈电网络并组阵，模型图如图4所示。XYPlot HFSSDesign1_0.00-2.50-5.00-7.50-10.00-12.50-15.00-17.50-20.00-22.504.004.254.504.755.00FreqGHz图8S11参数5.255.505.756.00Namemfl.00-3.000019.9638m232.00008

4、.173123100006.805010.005.00-0.00-5.00-10.00-15.00-20.00-25.00-200.00-150.00-100.00-61-90-120-150XYPt3HFSSDesign1Setupdx1=Setup-50.000.00ThetadegRadiationPattern150.00100.00150.00200.000.000.000.00-20.00150i090120-180图9方向图HFSSDeSign1CurveInfodB(GainTotal)Setup1:LastAdaptivedx1=60mmFreq=5GHzPhi=0degdB

5、(GainTotal)Setup1:LastAdaptive=60mm由S11参数图可以看到谐振点在5GHz,反射损耗较小，带宽约为2%。由方向图可以看到增益约为19.96dB，第一副瓣电平为-.79dB。参考文献ITUGlobalStandardforInternationalMobileTelecommunicationsS.IMT-Advanced,Circularletter,ITU-RMarch2008.N.Takehiro,N.Satoshi,B.AnassBenjebbour,etal.,TrendsinSmallCellEnhancementsinLTEAdvancedJ.IE

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