平行耦合微带线超宽带带通滤波器设计
Design of ultra wideband bandpass filter based on parallel coupled microstrip line
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摘要: 将平行耦合微带线设计方法与微波仿真软件ADS2009相结合,针对超宽带室内定位系统设计了带通滤波器.该设计将多级平行耦合微带线进行级联,解决滤波器频带窄、纹波特性差、插入损耗大等问题.选取高度、间隔和长度3个参数对滤波器进行优化与仿真,实物测量结果为插入损耗小于3 dB,带外抑制高于10 dB.与软件仿真结果相比,该设计结构简单、性能优良,可满足超宽带室内定位接收系统的需要.Abstract: Combining the design method of parallel coupled microstrip lines with microwave simulation software ADS2009,a bandpass filter was designed for the UWB(ultra wideband) indoor positioning system.By taking advantage of cascading multilevel parallel coupled microstrip lines,some problems of the filter were settled,such as the narrow bandwidth,the bad ripple characteristics and the big insertion loss,etc.The three parameters of height,spacing and length were selected as the object of optimization and simulation of the filter,the measurement results of the material object are as follows:the insertion loss was less than 3 dB,the out band rejection was higher than 10 dB.Comparing the measured results with the simulation results,the design method had the advantages of simple structure and superior performance and met the needs of the UWB indoor positioning system.
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Key words:
- ultra wideband(UWB) /
- bandpass filter /
- parallel coupled microstrip line
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