微带线阶梯型阻抗变换器(50ohm到100ohm)设计with HFSSVIP免费

1◆已知介质基片厚度h=1mm、相对介电常数=4.4、工作频率=2.4GHz2◆计算得=1.912mm=1.012mm=0.442mm=17.572mm取==3mm介质基片宽度=22mm3◆HFSS建模如下图仿真得到理想结果曲线时的模型的尺寸数据widthofsubstrateheightofgroundheightofsubstratewidthofthestripwhosefunctionistoconverttheimpedancelengthofthestripwhosefunctionistoconverttheimpedanceheightofstripwidthofthestripwhoseimpedanceis100ohmlengthofthestripwhoseimpedanceis100ohmlengthofthestripwhoseimpedanceis50ohmwidthofthestripwhoseimpedanceis50ohmwidthofport4◆仿真结果仿真结果在下一页。仿真结果很好，但与后来网分仪的结果差别很大。不过从网分仪上看出此次所做的实物还是实现了在2.4GHz频率信号下做阻抗变换的功能，同时可观察到该器件在2.556GHz信号下效果最好。5◆制作的实物2.002.202.402.602.803.00Freq[GHz]-60.00-50.00-40.00-30.00-20.00-10.00dB(S(WavePort1,WavePort1))AnsoftCorporationHFSSDesign1XYPlot10CurveInfodB(S(WavePort1,WavePort1))Setup1:Sweep12.002.202.402.602.803.00Freq[GHz]-1.00-0.500.000.501.00Y1AnsoftCorporationHFSSDesign1XYPlot12CurveInfoim(S(WavePort1,WavePort2))Setup1:Sweep1re(S(WavePort1,WavePort2))Setup1:Sweep16◆网分仪结果7◆计算贴片尺寸所用的程序的代码#include#include#definePI3.1415926voidmain(){doublec=300000000.0;doublef0;doubleZ0,Er,h,LEN,Ee,t;doublew,wz,A,B,bijiao;//不能写w'while(1){printf("导带厚度t=(毫米)");scanf("%lf",&t);printf("工作频率f0=(赫兹)");scanf("%lf",&f0);printf("特性阻抗Z0=(欧姆)");scanf("%lf",&Z0);printf("相对介电常数Er=");scanf("%lf",&Er);printf("介质基片厚度h=(毫米)");scanf("%lf",&h);if(t==0.0){bijiao=44.0-2*Er;if(Z0>bijiao){A=Z0*(sqrt(2.0*(Er+1)))/119.9+(Er-1)*(log(PI/2.0)+(log(4.0/PI))/Er)/(2.0*Er+2.0);w=h/((exp(A))/8.0-1/(4.0*exp(A)));Ee=(Er/2.0+1.0/2.0)/pow((1-(log(PI/2.0)+(log(4.0/PI))/Er)*(Er-1)/(2.0*A*(Er+1))),2);}if(Z0bijiao){A=Z0*(sqrt(2.0*(Er+1)))/119.9+(Er-1)*(log(PI/2.0)+(log(4.0/PI))/Er)/(2.0*Er+2.0);Ee=(Er/2.0+1.0/2.0)/pow((1-(log(PI/2.0)+(log(4.0/PI))/Er)*(Er-1)/(2.0*A*(Er+1))),2);wz=h/((exp(A))/8.0-1/(4.0*exp(A)));if(wz>(h/(2*PI)))w=wz+(1+log(2*h/t))*t/PI;elsew=wz+(1+log(4*PI*wz/t))*t/PI;}if(Z0(h/(2*PI)))w=wz+(1+log(2*h/t))*t/PI;elsew=wz+(1+log(4*PI*wz/t))*t/PI;Ee=(Er+1)/2+(Er/2.0-1.0/2)*pow((1+10*h/w),(-0.555));}LEN=c*1000/(4.0*f0*(sqrt(Ee)));printf("导体宽度w=%lf毫米\n",w);printf("等效介电常数Ee=%lf\n",Ee);printf("导体长度LEN=%lf毫米\n",LEN);}printf("\n");}}8◆一切经历都是财富我仿真完全是在用数据去试。改变任何一个数据，甚至是感觉无关的数据如、和边界尺寸，即使只改动0.1mm，也会有明显的变化。但他的变化似乎没有规律，例如=2mm时画出一条曲线，改为=2.1mm时，曲线的波谷向右边移动了，再改为=2.2mm时，波谷跑到第一条曲线的波谷的左边去了。理论没学到家吧。