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Compact dual-/tri-/quad-band bandpass filters with independently frequency-tunable and switchable passbands

Published online by Cambridge University Press:  09 September 2020

Zhao Li Open the ORCID record for Zhao Li [Opens in a new window] ,
Litian Wang ,
Ming He ,
Xiaqing Li ,
Zhelong Liang  and
Zhipeng Wang
Zhao Li
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin300350, China
Litian Wang
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin300350, China
Ming He*
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin300350, China China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Tianjin, China
Xiaqing Li
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin300350, China
Zhelong Liang
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin300350, China
Zhipeng Wang
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin300350, China
*
Author for correspondence: Ming He, E-mail: heming@nankai.edu.cn
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Abstract

This paper presents the design of frequency-tunable dual-band, tri-band and quad-band bandpass filters (BPFs). The proposed three BPFs can be independently tuned and individually switched by varying the capacitances of the varactors. In the designed tunable dual-band BPF (TD-BPF), common input/output feed lines are utilized for two tunable dual-mode resonators (TDRs). Further, three TDRs and four TDRs are employed to achieve tunable tri-band BPF (TT-BPF) and tunable quad-band BPF (TQ-BPF), respectively. Then, the TD-BPF and the TT-BPF are fabricated and measured to verify individual tunability and independent switchability. For the TD-BPF, the measurement results show that the center frequency (CF) of the first passband varies from 1.37 to 1.62 GHz, and the CF of the second passband varies from 2.3 to 2.64 GHz. In the measured TT-BPF, the tuning ranges of CFs of three passbands are 1.3–1.5 GHz, 2.36–2.6 GHz, and 3–3.54 GHz, respectively.

Keywords

tunable dual-/tri-/quad-band filtersdual-mode resonatorvaractor diodeindependent tunableswitchable
Type
Filters
Information
International Journal of Microwave and Wireless Technologies , Volume 13 , Issue 4 , May 2021 , pp. 322 - 334
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press in association with the European Microwave Association

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