摘要: |
针对网络综合方法不能直接设计滤波器驻波比的问题,提出了一种改进电路的滤波器驻
波比优化设计方法,即在网络综合法设计滤波电路的基础上,把电路输入输出端的并臂电感
转换为串臂电感,并直接并联电容以增加衰减极点,然后利用电路优化技术使得幅频特性对
称且通带内驻波比接近于1。仿真结果表明,优化后UHF频段超带宽滤波器幅频特性接
近算术对称,驻波比最大值仅为1.194,且3 dB带宽达到了444%。 |
关键词: 超带宽 带通滤波器 幅频特性 驻波比优化 算术对称 |
DOI: |
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基金项目:河北省教育厅科学研究基金资助项目(2006439) |
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VSWR Optimization for UHF UWB Analog Filter |
MA Hong-mei,LI Peng |
(North China Institute of Science and Technology, Beijing 101601, China) |
Abstract: |
To solve the problem that the network synthesis method can not design the filter
′s voltage standingwave ratio(VSWR),an improved method for the UHF UWB(Ultra
Wideba
nd) filter′s VSWR optimization is proposed. The parallel inductor is transforme
d to series
i
nductor which is in parallel with the capacitor to increase the attenuation pole
in the circuit designed by the network synthesis method,and then the amplitude
frequen
c
y arithmetic symmetry is realized and the VSWR is close to 1 by the circuit opti
mization technology. The simulation results show that the proposed method can ge
t arithmetic symmetrical amplitudefrequency and the max value of VSWR is only
1.194 in passband, and a 3 dB bandwidth of 44.4%. |
Key words: UWB bandpass filter amplitude frequency characteristic VSWR optimization arit
hmetic symmetry |