Design of a Compact and High Selectivity Tri-Band Bandpass Filter Using Asymmetric Stepped-impedance Resonators (SIRs)
Design of a Compact and High Selectivity Tri-Band Bandpass Filter Using Asymmetric Stepped-impedance Resonators (SIRs)
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DOI：
10.2528/pierl13112502
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发表时间：
2014
影响因子：
0.9
通讯作者：
Jun Li;S. Huang;J. Zhao
中科院分区：
文献类型：
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作者：
Jun Li;S. Huang;J. Zhao
本文提出了一种采用非对称阶跃阻抗谐振器（SIR）的小型化三频微带带通滤波器（BPF）。该滤波器仅使用一组非对称SIR，实现了三重通带响应，具有高选择性和带间隔离度。通过合理选择非对称SIR的阻抗和电长度比，设计了三频带通滤波器。通过采用交叉耦合结构和零馈电结构，实现了具有六个传输零点的高选择性频率响应。该三频滤波器的三个频段分别位于1.57/3.9/7 GHz，与以前使用相同衬底的工作相比，电路尺寸要小得多。测量结果与电磁仿真结果吻合较好。
In this article, a compact tri-band microstrip bandpass fllter (BPF) using asymmetric stepped-impedance resonators (SIRs) is proposed. Only one set of asymmetric SIRs are used in designing this fllter to achieve triple passband response with high selectivity and band-to-band isolation level. By properly selecting the impedance and electrical length ratios of the asymmetric SIRs, the tri-band BPF is designed. By using a cross-coupled conflguration and 0 - feed structure, high selectivity frequency responses with six transmission zeros are achieved. The three bands of the proposed tri-band fllter are located at 1.57/3.9/7GHz, respectively, and the circuit size is much smaller in comparison with previous works using the same substrate. Measured results are in good agreement with electromagnetic (EM) simulation.