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Chin. Phys. B, 2022, Vol. 31(7): 078401    DOI: 10.1088/1674-1056/ac4f4f

Switchable and tunable triple-channel bandpass filter

Ming-En Tian(田明恩)1, Zhi-He Long(龙之河)2, Li-Jun Feng(冯丽君)1, Lei-Lei He(贺磊磊)1, and Tian-Liang Zhang(张天良)1,†
1 School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu 611731, China;
2 Department of Mechanical Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR, China
Abstract  A triple-channel bandpass filter with switchable and tunable functions is proposed, which is based on a triple-mode cross resonator. The varactors and switching diodes are loaded at the end of the resonator. Because of the use of switches, resonators have four working states: conventional single-mode, two dual-modes, and one triple-mode. The varactor makes the channel independently adjustable. Finally, a triple-channel bandpass filter with switchable and tunable functions is designed by using two identical triple-mode resonator coupling structures. To solve the problem of whether each channel in the multi-channel filter is independently adjustable, this paper gives a simple and rigorous judgment method, namely rank criterion, which is a necessary and sufficient condition for each channel to be independently adjustable. The method of designing an element variable coupling matrix (EVCM) is adopted, which can not only obtain the desired frequency response through adjustable elements but also help to select resonators and coupling modes in the actual circuit design. The final circuit size of the designed filter is 0.29 λg×0.26 λg. The measured results are in good agreement with the simulation results.
Keywords:  independently adjustable      switchable      triple-channel  
Received:  20 November 2021      Revised:  18 January 2022      Accepted manuscript online:  27 January 2022
PACS:  84.30.Vn (Filters)  
  84.40.Dc (Microwave circuits)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61471094) and the Science and Technology Support Program of Sichuan Province, China (Grant Nos. 2019YFG0499 and 2020YFG0231).
Corresponding Authors:  Tian-Liang Zhang     E-mail:

Cite this article: 

Ming-En Tian(田明恩), Zhi-He Long(龙之河), Li-Jun Feng(冯丽君), Lei-Lei He(贺磊磊), and Tian-Liang Zhang(张天良) Switchable and tunable triple-channel bandpass filter 2022 Chin. Phys. B 31 078401

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