Compact Bandpass Filters Using Folded Quad-Mode Stub-Loaded Loop Resonators

Authors

  • Chen Liang College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics, Nanjing, 210000, China
  • Yun Liu College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics, Nanjing, 210000, China
  • Fanbin Tai College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics, Nanjing, 210000, China

Keywords:

Dual-band bandpass filter, Quad-mode Stub-loaded Loop Resonator (QMSLLR), single-band bandpass filter

Abstract

Folded quad-mode stub-loaded loop resonators (QMSLLRs) are proposed for realizing both bandpass and dual-band bandpass filters with compact dimensions. The QMSLLR is a folded square loop loaded with four short stubs, providing structure symmetry in both transversal and longitudinal directions. Determined by the lengths of the loaded stubs, the four resonant frequencies as analyzed with even-odd mode method can be either distributed in one passband with equal space, or in two passbands with a guard band in between, for realizing a single-band bandpass filter or a dual-band bandpass filter, respectively. For both the input and output couplings, two perpendicular feeding lines are parallel coupled to the QMSLLR at one corner. The measure results prove that the structure is suitable for the design of a medium band or even narrow band bandpass filters with compact dimensions.

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Author Biographies

Chen Liang, College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics, Nanjing, 210000, China

Chen Liang received the B.S. degree in Electrical Engineering from the Nanjing University of Aeronautics and Astronautics, Nanjing, China, in 2017 and he is a Master student in Nanjing University of Aeronautics and Astronautics, Nanjing, China. His research interests include microwave filters and during the graduate.

Yun Liu, College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics, Nanjing, 210000, China

Yun Liu was born in Dongtai, Jiangsu Province, China, in 1978. He received the B.S. and M.S. degrees in Radio Physics from Nanjing University, Nanjing, China, in 2000 and 2004, respectively, and the Ph.D. degree from the State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, China, in 2009. In 2009, he joined the Nanjing University of Aeronautics and Astronautics, Nanjing, where he is currently an Associate Professor. From Sept. 2016 to Sept. 2017, he was a Visiting Professor with the Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL, USA. His current research interests include microwave filters and passive components.

Fanbin Tai, College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics, Nanjing, 210000, China

Fanbin Tai received the B.S. degree in Electrical Information Engineering from the Binjiang College of Nanjing University of Information Science & Technology, Nanjing, China, in 2018, he is a graduate student in Nanjing University of Aeronautics and Astronautics, Nanjing. China. His research interests include microwave filters and micro vibration detection based on Doppler radar.

References

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Published

2020-10-01

How to Cite

[1]
Chen Liang, Yun Liu, and Fanbin Tai, “Compact Bandpass Filters Using Folded Quad-Mode Stub-Loaded Loop Resonators”, ACES Journal, vol. 35, no. 10, pp. 1217–1221, Oct. 2020.

Issue

2020: Vol 35 Iss 10

Section

Articles