5g微带阵列天线讲解.docx

1、5g微带阵列天线讲解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 对于工作频率 即为：步是选择合适的介质基板，假设介质的介电常数为 &r，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，式中，C波长，即为：是光速，辐射贴片的长度一般取为 飞/2 ；这里e是介质内的导波考虑到边缘缩短效应后，实际上的辐射单元长度 L应为:L C -2 丄2 f . ；e式中，计算，即为:；e是有效介电常数，厶L是等效辐射缝隙长度。它们可

2、以分别用下式1Er +1 Er 1 h -5；e (1 12 ) 22 2 w.丄412h(；e。川 264) 0.258)(w/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=4mmP寸，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。Freq GHz图2 S11参数图3增益图从图中

3、可以看出谐振点为5GHz计算的相对带宽为2.2%,增益为5.78dB2. 2 X 2阵列设计设计馈电网络并组阵，模型图如图 4所示。图4 2 X2微带天线阵列图5 S11参数由S11参数可以看到2X 2阵列天线谐振点为5GHz且此时的S11=-19dB,说明 反射损耗小，匹配良好。相对带宽约为 2.8%。Curve Info.dB(GainTotal) Setup1 : LastAdaptive Freq=5GHz P hi=0deg dB(GainTotal) Setup1 : LastAdaptive Freq=5GHz P hi=90deg图6方向图由方向图可以看出2X 2阵列天线的增益

4、为13.96dB,第一副瓣电平为-10.6dB , 可知组阵能使天线的增益变高。3. 4 X 4阵列天线天线阵列如图7所示：图74 X4阵列天线m2 5.0560 -10.4730dB(S(1,1) Setupl : Sw eep dy=12mm6 00图8 S11参数目 d nra CGOdRadiation Pattern 1HFSSDesig n1Curve Info dB(GainTotal)Setup1 : LastAdaptivedx仁60mm Freq=5GHz P hi=0deg dB(GainTotal)Setup1 : LastAdaptivedx仁60mm Freq=5G

5、Hz P hi=90deg图9方向图由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-11.79dB。参考文献1ITU Global Sta ndard for In ternatio nal MobileTelecom mun icatio nsS. IMT-Adva nced,Circular letter, ITU-R March 2008.2N. Takehiro, N. Satoshi, B. An ass Benjebbour, et al., Trends inSmall Cell Enhancementsi

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