Wide-Stopband SIW Filters Using Modified Multi-Spurious Modes Suppression Technique
Wide-Stopband SIW Filters Using Modified Multi-Spurious Modes Suppression Technique
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DOI：
10.1109/tcsii.2020.2982449
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
Haowei Xie;K. Zhou;Chun-Xia Zhou;Wen Wu
中科院分区：
文献类型：
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作者：
Haowei Xie;K. Zhou;Chun-Xia Zhou;Wen Wu
提出了一种改进的多杂散模抑制技术来实现宽阻带基片集成波导（SIW）带通滤波器（BPF），即将外部端口和内部耦合窗口设置在特定杂散模电场最弱的位置。为了在有限的设计自由度下尽可能宽地扩展阻带，充分利用不同的馈电和耦合位置来抑制特定腔中的不需要的模式。通过尽可能多地抑制带外杂散峰值，并将第一个未抑制的杂散谐振移到最远位置，可以从本质上实现最宽的阻带。作为示范，设计、制作和测试了一个二阶和三阶基片集成波导带通滤波器，其阻带分别为2.51和3.85，抑制电平分别优于25 dB和20 dB。
A modified multi-spurious modes suppression technique is proposed to realize wide-stopband substrate-integrated waveguide (SIW) bandpass filters (BPFs), which is to set the external ports and internal coupling windows to the positions of weakest electric fields of specific spurious modes. To extend the stopband as wide as possible with the limited design degrees of freedom, different feeding and coupling positions are fully exploited to reject unwanted modes in specific cavities. By suppressing the out-of-band spurious peaks as much as possible and removing the first unsuppressed spurious resonance to the farthest position, the widest stopband can be achieved intrinsically. A second- and a third-order SIW BPFs are synthesized, designed, fabricated, and tested as demonstrations, realizing the stopbands of $2.51{f} _{0}$ and $3.85{f} _{0}$ with the rejection level better than 25 dB and 20 dB, respectively.