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Air-filled substrate integrated waveguide bandpass filter based on miniaturized non-resonant node structure

Published online by Cambridge University Press:  02 July 2024

Yunlong Li Open the ORCID record for Yunlong Li [Opens in a new window] ,
Changjun Tian ,
Shaozhuo Li ,
Peng Chen Open the ORCID record for Peng Chen [Opens in a new window] ,
Yun Li  and
Kai Yang
Yunlong Li
Affiliation:
School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Cheng Du, China
Changjun Tian
Affiliation:
School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Cheng Du, China
Shaozhuo Li
Affiliation:
School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Cheng Du, China
Peng Chen
Affiliation:
School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Cheng Du, China Laboratory, Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province, Cheng Du, China
Yun Li
Affiliation:
Academy, National Key Laboratory of Science and Technology on Space Microwave, China Academy of Space Technology (Xi’an), Xi’an, China
Kai Yang*
Affiliation:
School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Cheng Du, China Laboratory, Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province, Cheng Du, China
*
Corresponding author: Kai Yang; Email: kyang@uestc.edu.cn
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Abstract

This paper proposes an air-filled substrate integrated waveguide (AFSIW) bandpass filter with a miniaturized non-resonant node (NRN). The NRN structure is introduced between the three resonators, and its size is smaller than the resonator size, which can realize the NRN structure’s miniaturization and reduce the model’s size. The NRN size of this filter is 41% of the NRN size of the existing AFSIW filter. This filter also introduces a transmission zero (TZ) above the passband. The measured results show that the filter’s center frequency is 20.73 GHz, and the bandwidth is 0.86 GHz. The insertion loss in the passband is 0.95 dB, and the return loss is better than 23 dB. Due to the TZ in the upper stopband, the AFSIW filter obtained good selectivity.

Keywords

air-filled substrate integrated waveguidebandpass filterminiaturizationnon-resonant node

Information

Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 16 , Issue 6 , July 2024 , pp. 919 - 924
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Copyright
© The Author(s), 2024. Published by Cambridge University Press in association with The European Microwave Association.

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