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UHF频段超带宽模拟滤波器驻波比的优化设计
马红梅,李鹏
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(华北科技学院，北京 101601)

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444%。

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：

基金项目:河北省教育厅科学研究基金资助项目(2006439)

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 standingwave 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 amplitudefrequency and the max value of VSWR is only 1.194 in passband, and a 3 dB bandwidth of 44.4%.

Key words: UWB bandpass filter amplitude frequency characteristic VSWR optimization arit hmetic symmetry