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Design of dual-band tunable bandpass filter with constant absolute bandwidth based on triple transmission path

Published online by Cambridge University Press:  14 February 2024

Jing Guo Open the ORCID record for Jing Guo [Opens in a new window] ,
Lirong Qian Open the ORCID record for Lirong Qian [Opens in a new window] ,
Litian Wang ,
Cuiping Li ,
Yahui Tian  and
Honglang Li
Jing Guo
Affiliation:
Tianjin Key Laboratory of Film Electronic and Communication Devices, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, China Engineering Research Center for Optoelectronic Devices and Communication Technology of Ministry of Education, Tianjin University of Technology, Tianjin, China
Lirong Qian*
Affiliation:
Tianjin Key Laboratory of Film Electronic and Communication Devices, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, China Engineering Research Center for Optoelectronic Devices and Communication Technology of Ministry of Education, Tianjin University of Technology, Tianjin, China
Litian Wang
Affiliation:
Tianjin Key Laboratory of Film Electronic and Communication Devices, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, China Engineering Research Center for Optoelectronic Devices and Communication Technology of Ministry of Education, Tianjin University of Technology, Tianjin, China
Cuiping Li
Affiliation:
Tianjin Key Laboratory of Film Electronic and Communication Devices, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, China Engineering Research Center for Optoelectronic Devices and Communication Technology of Ministry of Education, Tianjin University of Technology, Tianjin, China
Yahui Tian
Affiliation:
Institute of Acoustics, Chinese Academy of Sciences, Beijing, China
Honglang Li
Affiliation:
National Center for Nanoscience and Technology, Beijing, China
*
Corresponding author: Lirong Qian; Email: lirongqian83@email.tjut.edu.cn
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Abstract

In this paper, a novel tunable dual-band bandpass filter (BPF) with independently controlled passbands and constant absolute bandwidth (CABW) is proposed. The CABW passbands of designed dual-band BPF are obtained using manageable electric and magnetic mix coupling. Furthermore, the multiple transmission paths from the input port to the output port are extended for extra transmission zeros, which results in modified selectivity of the proposed dual-band BPF. The tunability and switchability of the developed filter can be implemented by introducing a single bias voltage of varactors for each band. For the tunable dual-band BPF, the simulated results show that the center frequency (CF) of the first passband varies from 2.38 to 2.68 GHz, and the CF of the second passband varies from 3.28 to 3.88 GHz, while 3-dB absolute bandwidths are 101 ± 7 MHz and 98 ± 4 MHz, respectively. Moreover, the two passbands of the filter can also be independently switched by removing the voltage imposed on the varactor CV1 and CV2. The measured results agree well with simulated results, which verify the design theory.

Keywords

bandpass filterconstant absolute bandwidthswitchabletunablevaractor
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 11
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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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