Cross-Coupled Wide Stopband SIW Bandpass FilterLoading Snake-shaped Slot

作者

  • Yawen He School of Marine Information Engineering Jimei University, Xiamen 361021, China
  • Zhonghua Ma School of Marine Information Engineering Jimei University, Xiamen 361021, China
  • Mengnan Wang School of Marine Information Engineering Jimei University, Xiamen 361021, China
  • Jingyao Huang School of Marine Information Engineering Jimei University, Xiamen 361021, China
  • Yanfeng Jiang College of IoT Engineering Jiangnan University, Wuxi 214122, China

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https://doi.org/10.13052/2024.ACES.J.400409

关键词:

Bandpass filter, cross-coupling, transmission zeros, wide stopband

摘要

In this paper, a novel fourth-order bandpass filter is proposed and fulfilled, which is based on a cross-coupling structure achieved by etching snake-shaped slots between vias of adjacent SIW cavities. The gap of the vias’ wall between adjacent SIW cavities is used to achieve coupling between the two cavities. The length of the coupling gap can be adjusted to change the resonant frequency of TE101 mode to TE201 mode. The offset distance between the ports and the centerline is disclosed as a key parameter to suppress undesired modes, achieving wide stopband characteristics. The snake-shaped slot is loaded on the vias’ wall between SIW cavities for the enhancement of the electrical coupling, which produces a pair of transmission zeros (TZs) on either side of the passband, enhancing frequency selectivity. The filter design is validated through simulation, fabrication, and measurement of a fourth-order SIW filter with TZs. It is verified that the designed filter shows promising characteristics, with a center frequency of 24.1 GHz, an insertion loss of 0.52 dB, and a return loss exceeding 11.8 dB. It is observed that two TZs appear at 22.82 GHz and 25.15 GHz, respectively, each exhibiting a suppression level better than 20 dB. The designed filter shows potential applications in microwave and radio frequency circuits, as well as in wireless communication systems.

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Yawen He was born in Nanjing, China, in 2001. She received the bachelor’s degree in communication engineering from Wuyi University, Nanping, China, in 2023. She is currently working toward the Postgraduate degree in Information and Communication Engineering, Jimei University, Xiamen, China. Her research interest is RF microwave millimeter wave circuit design.

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Zhonghua Ma was born in Gansu, China, in 1973. He received his Ph.D. in Microelectronics from Lanzhou University, Lanzhou, China, in 2018. His present research interests include antenna techniques, RF and microwave circuits design and IoT.

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Mengnan Wang was born in Pingdingshan, China, in 2000. She received the bachelor’s degree in communication engineering from Zhengzhou University of Aeronautics, Zhengzhou, China, in 2022. She is currently working toward the Postgraduate degree in Information and Communication Engineering, Jimei University, Xiamen, China. Her research interest is chipless RFID sensors.

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Jingyao Huang was born in Xiamen, China, in 2004. She is currently pursuing her B.S. degree with the Department of Communication Engineering, Jimei University, Xiamen, China. Her research interests are in microwave technology and rectenna technology.

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Yanfeng Jiang was born in Jilin, China, in 1972. He received the B.S. degree in Electrical Engineering from Southeast University, Nanjing, China, in 1993, and Ph.D. degree in Microelectronics from Lanzhou University, Lanzhou, China, in 2000. He is now full professor in Jiangnan University, Wuxi, China. His research interests include integrated circuit design, power semiconductor devices and magnetic devices.

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已出版

2025-04-30

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[1]
Y. . He, Z. . Ma, M. . Wang, J. . Huang, 和 Y. . Jiang, 《Cross-Coupled Wide Stopband SIW Bandpass FilterLoading Snake-shaped Slot》, ACES Journal, 卷 40, 期 04, 页 350–362, 4月 2025.

期

2025: Vol 40 Iss 4

栏目

General Submission

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