pcbComponentgydF4y2Ba
这个例子向你展示如何设计和分析带阻滤波器使用gydF4y2BapcbComponentgydF4y2Ba
对象。设计中频分数带宽(FBW)为1.0的带阻滤波器gydF4y2Ba
的频带边缘频率为2.5 GHzgydF4y2Ba
= 1.25 GHz和gydF4y2Ba
= 3.75 GHz,定义参考[1]的图6.11b。gydF4y2Ba
设计了基于三极(n = 3)切比雪夫低通原型带0.05 dB通带纹波的微带带阻滤波器。低通原型的元素值为gydF4y2Ba
=gydF4y2Ba
= 1.0,gydF4y2Ba
=gydF4y2Ba
= 0.8794,gydF4y2Ba
= 1.1132。使用n = 3和的设计方程gydF4y2Ba
= 50 ΩgydF4y2Ba
=gydF4y2Ba
= 50欧姆,gydF4y2Ba
=gydF4y2Ba
= 106.8544欧姆,gydF4y2Ba
=gydF4y2Ba
= 93.9712欧姆,gydF4y2Ba
= 44.9169欧姆。选择商用衬底gydF4y2Ba(RT / D 6006)gydF4y2Ba
相对介电常数为6.15,厚度为1.27 mm。使用微带设计方程计算微带宽度。图中为表示不同特征尺寸的微带带阻滤波器[1]的原理图。gydF4y2Ba
使用gydF4y2BatraceRectangulargydF4y2Ba
对象创建gydF4y2Ba咱gydF4y2Ba
,gydF4y2BaZ1gydF4y2Ba
,gydF4y2BaZ12。gydF4y2Ba
对微带形状执行布尔加法操作gydF4y2Ba咱gydF4y2Ba
,gydF4y2BaZ1gydF4y2Ba
,gydF4y2BaZ12gydF4y2Ba
并创建一个gydF4y2BaLeftSectiongydF4y2Ba
对象。可视化gydF4y2BaLeftSectiongydF4y2Ba
使用gydF4y2Ba显示gydF4y2Ba
函数。gydF4y2Ba
ZA_Width = 1.85 e - 3;ZA_Length = 7 e - 3;Z1_Length = 0.3 e - 3;Z1_Width = 15.15 e - 3;Z12_Length = 14.05 e - 3;Z12_Width = 0.45 e - 3;Z2_Length = 2.3 e - 3;Z2_Width = 14.85 e - 3;gndL = 45 e - 3;gndW = 30 e - 3; ZA = traceRectangular(“长度”gydF4y2BaZA_Length + Z1_Length / 2,gydF4y2Ba“宽度”gydF4y2BaZA_Width,gydF4y2Ba...gydF4y2Ba“中心”gydF4y2Ba, (-gndL / 2 + ZA_Length / 2 + Z1_Length / 4 0]);Z1 = traceRectangular (gydF4y2Ba“长度”gydF4y2BaZ1_Length,gydF4y2Ba“宽度”gydF4y2BaZ1_Width + ZA_Width / 2,gydF4y2Ba...gydF4y2Ba“中心”gydF4y2Ba, (-gndL / 2 + ZA_Length + Z1_Length / 2 (Z1_Width / 2 + ZA_Width / 4)));Z12 = traceRectangular (gydF4y2Ba“长度”gydF4y2Ba, Z12_Length + Z1_Length,gydF4y2Ba“宽度”gydF4y2BaZ12_Width,gydF4y2Ba...gydF4y2Ba“中心”gydF4y2Ba, (-gndL / 2 + ZA_Length + Z1_Length / 2 + Z12_Length / 2 0]);LeftSection =咱+ Z1 + Z12;图;显示(LeftSection);gydF4y2Ba
使用gydF4y2Ba复制gydF4y2Ba
,gydF4y2BarotateZgydF4y2Ba
和gydF4y2BarotateXgydF4y2Ba
功能gydF4y2BaLeftSectiongydF4y2Ba
对象创建gydF4y2BaRightSectiongydF4y2Ba
.可视化gydF4y2BaRightSectiongydF4y2Ba
对象。gydF4y2Ba
RightSection = (LeftSection)复印件;RightSection = rotateZ (RightSection, 180);RightSection = rotateX (RightSection, 180);图;显示(RightSection);gydF4y2Ba
对形状执行布尔添加操作gydF4y2BaLeftSectiongydF4y2Ba
和gydF4y2BaRightSectiongydF4y2Ba
创建一个gydF4y2BacombineSectiongydF4y2Ba
对象。使用gydF4y2BatraceRectangulargydF4y2Ba
对象创建centerArmgydF4y2BaZ2gydF4y2Ba
.对形状执行布尔添加操作gydF4y2BacombineSectiongydF4y2Ba
,gydF4y2BaZ2gydF4y2Ba
,并创建一个gydF4y2Ba过滤器gydF4y2Ba
对象。可视化gydF4y2Ba过滤器gydF4y2Ba
对象。gydF4y2Ba
组合section = LeftSection + RightSection;Z2 = traceRectangular (gydF4y2Ba“长度”gydF4y2BaZ2_Length,gydF4y2Ba“宽度”gydF4y2BaZ2_Width,gydF4y2Ba...gydF4y2Ba“中心”gydF4y2Ba, [0 -Z12_Width / 2 + Z2_Width / 2]);filter = combineSection + Z2;显示(过滤器);gydF4y2Ba
定义衬底参数并创建一种电介质用于gydF4y2BapcbComponentgydF4y2Ba
设计的滤波器。创建一个接地面使用gydF4y2BatraceRectangulargydF4y2Ba
形状。gydF4y2Ba
基质=介质(gydF4y2Ba“EpsilonR”gydF4y2Ba, 6.15,gydF4y2Ba“LossTangent”gydF4y2Ba, 0.0027,gydF4y2Ba...gydF4y2Ba“名称”gydF4y2Ba,gydF4y2Ba“自定义”gydF4y2Ba,gydF4y2Ba“厚度”gydF4y2Ba1.27 e - 3);地面= traceRectangular (gydF4y2Ba“长度”gydF4y2BagndL,gydF4y2Ba“宽度”gydF4y2BagndW,gydF4y2Ba...gydF4y2Ba“中心”gydF4y2Ba[0, 6 e - 3]);gydF4y2Ba
pcbComponentgydF4y2Ba
使用gydF4y2BapcbComponentgydF4y2Ba
创建一个过滤器PCB。将电介质和接地面分配给gydF4y2Ba层gydF4y2Ba
财产的gydF4y2BapcbComponentgydF4y2Ba
.分配gydF4y2BaFeedLocationsgydF4y2Ba
到进料口的边缘。设置gydF4y2BaBoardThicknessgydF4y2Ba
到1.27毫米gydF4y2BapcbComponentgydF4y2Ba
把滤镜形象化。gydF4y2Ba
pcb = pcbComponent;pcb。BoardShape = ground; pcb.BoardThickness = 1.27e-3; pcb.Layers ={filter,substrate,ground}; pcb.FeedDiameter = ZA_Width/2; pcb.FeedLocations = [-gndL/2 0 1 3;gndL/2 0 1 3]; figure; show(pcb);
使用gydF4y2BasparametersgydF4y2Ba
函数计算带阻滤波器的s参数,并使用gydF4y2BarfplotgydF4y2Ba
函数。gydF4y2Ba
晶石= sparameters (pcb, linspace (0.1 e9 6 e9 50));图;rfplot(石膏);gydF4y2Ba
由于结果中有四条曲线,我们来分析一下结果。gydF4y2Ba
分析gydF4y2Ba ,gydF4y2Ba 了解带阻滤波器的特性。gydF4y2Ba
图;rfplot(晶石,1,1);持有gydF4y2Ba在gydF4y2Ba;rfplot(晶石,1 2);持有gydF4y2Ba在gydF4y2Ba;gydF4y2Ba
结果表明,该滤波器具有中心频率gydF4y2Ba = 2.5 GHz的频带频率gydF4y2Ba = 1.75 GHz和gydF4y2Ba = 3.4 GHz。的gydF4y2Ba 值接近0 dBgydF4y2Ba 值小于- 10dbgydF4y2Ba = 1.75 GHz和gydF4y2Ba = 3.4 GHz。因此,设计的滤波器具有阻带响应。gydF4y2Ba
使用gydF4y2Ba负责gydF4y2Ba
功能显示带阻滤波器金属表面和介质上的电荷分布。gydF4y2Ba
图;2.4 e9电荷(pcb);gydF4y2Ba
图;收费(2.4 e9 pcb,gydF4y2Ba“介质”gydF4y2Ba);gydF4y2Ba
使用gydF4y2Ba当前的gydF4y2Ba
函数可视化金属表面的电流分布和带阻滤波器介质上的体积极化电流gydF4y2Ba
图;当前(pcb, 2.4 e9);gydF4y2Ba
图;当前(pcb、2.4 e9gydF4y2Ba“介质”gydF4y2Ba);gydF4y2Ba
Jia-Sheng Hong,“用于射频/微波应用的微带滤波器”,p. 184, John Wiley & Sons,第二版,2011。gydF4y2Ba