Q值对滤波特性的影响课件.pptx

1、Q值对滤波器滤波特性的影响中心频率：10.575GHz带宽：200MHz滤波器级数：7阶 滤波器拓扑结构如下 滤波器拓扑结构如下 300 300 300 300 300 300 300 m66=13.0113e-03 m55=41.3935e-03 m44=33.298e-03 m33=11.018e-03 m22=3.962e-03 m67=1.03104 m56=717.907e-03 m45=687.459e-03 m34=694.708e-03 m23=744.405e-03 m12=1.11719 m01=1.20288 m11=m77=0 Q=30010.210.410.610.8

2、11.011.210.011.4-120-100-80-60-40-20-1400freq,G H zdB(S(2,1)10.47G-9.512 m 110.68G-9.550 m 2dB(S(1,1)m 1f req=dB(S(2,1)=-9.51210.47G H zm 2f req=dB(S(2,1)=-9.55010.68G H z滤波器拓扑结构如下 8000 300 300 300 300 300 8000 m66=4.36562e-03 m55=19.7918e-03 m44=61.7533e-03 m33=61.0965e-03 m22=24.0029e-03 m67=915.4

3、86e-03 m56=735.233e-03 m45=705.558e-03 m34=679.579e-03 m23=713.891e-03 m12=1.06347 m01=1.09722 m11=m77=0 Q1=Q7=800010.210.410.610.811.011.210.011.4-120-100-80-60-40-20-1400freq,G H zdB(S(2,1)10.47G-7.791 m 110.68G-8.870 m 2dB(S(1,1)m 1f req=dB(S(2,1)=-7.79110.47G H zm 2f req=dB(S(2,1)=-8.87010.68G H

4、 z滤波器拓扑结构如下 300 8000 300 300 300 8000 300 m66=5.96075e-03 m55=-35.4089e-03 m44=-16.6564e-03 m33=-2.71184e-03 m22=3.79651e-03 m67=1.0832 m56=665.73e-03 m45=637.292e-03 m34=657.118e-03 m23=750.055e-03 m12=1.01495 m01=1.20737 m11=m77=0 Q2=Q6=800010.210.410.610.811.011.210.011.4-120-100-80-60-40-20-1400

5、freq,G H zdB(S(2,1)10.47G-7.274 m 110.67G-6.049 m 2dB(S(1,1)m 1f req=dB(S(2,1)=-7.27410.47G H zm 2f req=dB(S(2,1)=-6.04910.67G H z滤波器拓扑结构如下 300 300 8000 300 8000 300 300 m66=32.2336e-03 m55=22.2837e-03 m44=4.53024e-03 m33=-3.30043e-03 m22=6.89597e-03 m67=1.13412 m56=709.815e-03 m45=560.394e-03 m34=6

6、61.87e-03 m23=666.089e-03 m12=1.26387 m01=1.48972 m11=m77=0 Q3=Q5=800010.210.410.610.811.011.210.011.4-120-100-80-60-40-20-1400freq,G H zdB(S(2,1)10.47G-6.795 m 110.68G-6.589 m 2dB(S(1,1)m 1f req=dB(S(2,1)=-6.795opt I t er=99910.47G H zm 2f req=dB(S(2,1)=-6.589opt I t er=99910.68G H z结果对比10.3110.401

7、0.5010.6010.7010.8010.90Freq GHz-40.00-35.00-30.00-25.00-20.00-15.00-10.00-5.00Y1Ansoft LLCHFSSDesign1XY Plot 1ANSOFTCurve InfodB(S(2,1)ImporteddB(S(2,1)_1ImporteddB(S(2,1)_2ImporteddB(S(2,1)_3Imported上图中四条曲线是高Q值在不同位置时的S21曲线，红色曲线是Q值都取3001曲线是Q1=Q7=80002曲线是Q2=Q6=80003曲线是Q3=Q4=8000红色曲线与1、2、3曲线比较可知，Q值增大

8、可以减小插入损耗，同时会改善低Q值“塌肩”现象；1、2、3曲线比较，高Q值的谐振器在中间比高Q 值谐振器在两边的。滤波器拓扑结构如下 滤波器拓扑结构如下 300 300 300 300 300 300 300 m66=508.3e-03 m55=63.6097e-03 m44=-296.514e-03 m33=-99.3516e-03 m22=-384.596e-03 m67=961.21e-03 m56=973.661e-03 m45=1.72371 m34=1.66825 m23=970.85e-03 m46=693.201e-03 m24=670.203e-03 m12=963.622e

9、-03 m01=1.03383 m11=m77=-0.0015810654 Q值全取30010.210.410.610.811.011.210.011.4-80-60-40-20-1000freq,G H zdB(S(2,1)10.47G-9.020 m 110.68G-8.873 m 2dB(S(1,1)m 1f req=dB(S(2,1)=-9.02010.47G H zm 2f req=dB(S(2,1)=-8.87310.68G H z滤波器拓扑结构如下 8000 8000 300 300 8000 300 300 m66=-5.90452e-03 m55=-590.604e-03 m

10、44=48.3419e-03 m33=640.685e-03 m22=35.7356e-03 m67=1.55819 m56=819.464e-03 m45=617.332e-03 m34=612.555e-03 m23=686.829e-03 m46=413.329e-03 m24=348.88e-03 m12=1.41481 m01=1.5067 m11=m77=-0.0015810654 第3、4、5个Q值取800010.210.410.610.811.011.210.011.4-80-60-40-20-1000freq,G H zdB(S(2,1)R eadoutm 1R eadout

11、m 2dB(S(1,1)m 1f req=dB(S(2,1)=-2.70710.47G H zm 2f req=dB(S(2,1)=-2.79810.68G H z滤波器拓扑结构如下 8000 300 300 8000 8000 300 300 m66=53.2567e-03 m55=-594.816e-03 m44=24.0248e-03 m33=565.362e-03 m22=28.6704e-03 m67=1.54088 m56=744.7e-03 m45=631.933e-03 m34=578.251e-03 m23=650.877e-03 m46=394.953e-03 m24=32

12、4.016e-03 m12=1.32003 m01=1.60597 m11=m77=-0.0015810654 2、3、410.210.410.610.811.011.210.011.4-80-60-40-20-1000freq,G H zdB(S(2,1)10.47G-2.352 m 110.68G-4.317 m 2dB(S(1,1)m 1f req=dB(S(2,1)=-2.35210.47G H zm 2f req=dB(S(2,1)=-4.31710.68G H z滤波器拓扑结构如下 300 8000 300 300 8000 8000 300 m66=-12.599e-03 m55

13、=-597.442e-03 m44=-63.2141e-03 m33=555.25e-03 m22=-8.58713e-03 m67=1.44457 m56=641.638e-03 m45=587.957e-03 m34=564.679e-03 m23=821.656e-03 m46=302.664e-03 m24=358.783e-03 m12=1.65426 m01=1.5706 m11=m77=-0.0015810654 4、5、610.210.410.610.811.011.210.011.4-80-60-40-20-1000freq,G H zdB(S(2,1)dB(S(1,1)10

14、.3210.4010.5010.6010.7010.8010.90Freq GHz-71.82-62.50-50.00-37.50-25.00-12.50-1.84Y1Ansoft LLCHFSSDesign1XY Plot 1ANSOFTCurve InfodB(St(feedpin1_T1,feedpin1_T1)Setup1:Sweep1dB(St(feedpin1_T1,feedpin1_T2)Setup1:Sweep1dB(S(2,1)ImporteddB(S(2,1)_1ImporteddB(S(2,1)_2Imported上图中两条曲线都是由3个Q值为8000仿真得出。红色曲线Q

15、3=Q4=Q5=8000蓝色曲线Q4=Q5=Q6=8000第3条Q2=Q3=Q4=8000比较两图可知三个高Q都在中间时曲线两边陡峭性都很好;高Q在中间偏左时，左边陡峭性好，而右边差；高Q偏右时，右边陡峭性好，左边差。在交叉耦合结构中，中间三个谐振器Q值对滤波特性影响较大，很大程度上改善矩形系数以及插入损耗。二、并联结构滤波器 滤波器拓扑结构如下 Q=30010.110.210.310.410.510.610.710.810.910.011.0-50-40-30-20-10-600freq,G H zdB(S(2,1)dB(S(1,1)Q1=Q5=800010.110.210.310.410.

16、510.610.710.810.910.011.0-50-40-30-20-10-600freq,G H zdB(S(2,1)dB(S(1,1)Q2=Q4=800010.110.210.310.410.510.610.710.810.910.011.0-50-40-30-20-10-600freq,G H zdB(S(2,1)dB(S(1,1)Q=300；Q6=Q7=800010.0010.2010.4010.6010.8011.00Freq GHz-60.00-50.00-40.00-30.00-20.00-10.000.00Y1Ansoft LLCHFSSDesign1XY Plot 1A

17、NSOFTCurve InfodB(St(feedpin1_T1,feedpin1_T1)Setup1:Sweep1dB(St(feedpin1_T1,feedpin1_T2)Setup1:Sweep1dB(S(2,1)ImporteddB(S(2,1)_1ImportedQ=300;Q1=Q5=800010.0010.2010.4010.6010.8011.00Freq GHz-60.00-50.00-40.00-30.00-20.00-10.000.00Y1Ansoft LLCHFSSDesign1XY Plot 1ANSOFTCurve InfodB(St(feedpin1_T1,fee

18、dpin1_T1)Setup1:Sweep1dB(St(feedpin1_T1,feedpin1_T2)Setup1:Sweep1dB(S(2,1)ImporteddB(S(2,1)_1ImportedQ=300;Q2=Q4=8000（红）10.0010.2010.4010.6010.8011.00Freq GHz-60.00-50.00-40.00-30.00-20.00-10.000.00Y1Ansoft LLCHFSSDesign1XY Plot 1ANSOFTCurve InfodB(St(feedpin1_T1,feedpin1_T1)Setup1:Sweep1dB(St(feedp

19、in1_T1,feedpin1_T2)Setup1:Sweep1dB(S(2,1)ImporteddB(S(2,1)_1Imported由以上几幅图可以看出，当滤波器结构排成两排，一排五个谐振器，一排两个，此时第2排两个谐振器Q值以及第1排中间三个会影响滤波特性，改善矩形系数，插损，第二排两个谐振器Q值影响更大一些；第1排两边的谐振器Q值几乎不影响滤波特性。三、并联结构滤波器 滤波器拓扑结构如下 Q=300（红）；Q5=Q7=800010.0010.2010.4010.6010.8011.00Freq GHz-62.50-50.00-37.50-25.00-12.500.00Y1Ansoft

20、LLCHFSSDesign1XY Plot 1ANSOFTCurve InfodB(St(feedpin1_T1,feedpin1_T1)Setup1:Sweep1dB(St(feedpin1_T1,feedpin1_T2)Setup1:Sweep1dB(S(2,1)ImporteddB(S(2,1)_1ImportedQ=300（红）；Q1=Q4=800010.0010.2010.4010.6010.8011.00Freq GHz-70.00-60.00-50.00-40.00-30.00-20.00-10.000.00Y1Ansoft LLCHFSSDesign1XY Plot 1ANSO

21、FTCurve InfodB(St(feedpin1_T1,feedpin1_T1)Setup1:Sweep1dB(St(feedpin1_T1,feedpin1_T2)Setup1:Sweep1dB(S(2,1)ImporteddB(S(2,1)_1ImportedQ=300（红）；Q2=Q3=800010.0010.2010.4010.6010.8011.00Freq GHz-75.00-62.50-50.00-37.50-25.00-12.500.00Y1Ansoft LLCHFSSDesign1XY Plot 1ANSOFTCurve InfodB(St(feedpin1_T1,feedpin1_T1)Setup1:Sweep1dB(St(feedpin1_T1,feedpin1_T2)Setup1:Sweep1dB(S(2,1)ImporteddB(S(2,1)_2Imported由上述3图可以看出，该结构滤波器矩形系数不会因加入高Q值而改善，但高Q值会减小插损。