Novel miniaturized low-pass filters from artificial transmission line structures
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摘要: 提出了一种基于人工传输线结构的小型化低通滤波器的设计方法。通过利用电磁仿真软件直接构建出微带电抗器件并对其逐一进行参数提取验证，将设计的微带电抗器件进行组合集成和调试后得到相应的低通滤波电路。对5阶巴特沃兹低通滤波电路和0.5 dB切比雪夫低通滤波电路的设计和测量结果对比表明，采用本方法所设计的滤波器结构紧凑，面积约为常规低通滤波电路的23%，测量结果与仿真吻合。Abstract: A novel design on miniaturized low-pass filters from artificial transmission line structures is proposed. Reactance components, i. e. capacitors and inductors, are directly constructed from microstrip structures based on electromagnetic simulation and parameter extraction. The constructed reactance components are integrated to build low-pass filters. The results of two 5th-order Butterworth and 0.5 dB ripple Chebyshev low-pass filters, which are realized by the proposed method, are presented. The proposed low-pass filter is compact and its size is only 23% of a conventional filter. The simulation agrees well to the measurements, which shows the validation of the proposed design method. The miniaturized low-pass filters have good applications in microwave systems.
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