Optimal design of third-order microstrip bandpass filters by direct synthesis technique (DST)
Optimal design of third-order microstrip bandpass filters by direct synthesis technique (DST)
复制标题
利用直接合成技术（DST）优化设计三阶微带带通滤波器
DOI：
10.1002/cta.2499
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发表时间：
2018
影响因子：
2.3
通讯作者：
Zhang Yong
中科院分区：
文献类型：
--
作者：
Xiao Fei;Gong Huarong;Zhang Yong
由于微带滤波器的分布元件效应，设计微带滤波器并不容易。了解它们的物理机制对它们的设计无疑是非常重要的。本文讨论了一种设计三阶微带带通滤波器的有效方法，该滤波器在通带两侧各有两个传输零点。集总元件等效电路用于表示这些微带滤波器。然后，这些集总元件等效电路可以通过我们最近提出的直接综合技术进行综合，从而可以计算这些微带滤波器的初始结构参数，然后方便它们的设计。经实测结果验证，该方法设计的滤波器性能接近理想频率响应。在此基础上，提出了另一种三阶微带带通滤波器，该滤波器在输入/输出端引入开路短截线以抑制特定谐波，从而改善带外衰减。
To design microstrip filters is not easy for the sake of their distributed‐element effect. Undoubtedly, to understand their physical mechanism is very important to their design. In this paper, one effective approach to design some third‐order microstrip bandpass filters with each of 2 transmission zeros at each side of the passband is discussed. Lumped‐element equivalent circuits are used to represent these microstrip filters. Then, these lumped‐element equivalent circuits can be synthesized by direct synthesis technique we recently proposed, so that it is likely to calculate initial structural parameters of these microstrip filters and then facilitate their design. Verified by the measured results of the filter designed through the approach in this paper, the performance of the filters is close to ideal frequency responses. Furthermore, another third‐order microstrip bandpass filter is presented, in which open‐circuited stubs at input/output ports are introduced to suppress one specified harmonic to improve out‐of‐band attenuation.