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A tunable bandpass filter with extended passband bandwitdh

Published online by Cambridge University Press:  03 February 2022

Gaoya Dong Open the ORCID record for Gaoya Dong [Opens in a new window] ,
Shaosheng Li  and
Xiaolong Yang
Gaoya Dong*
Affiliation:
School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China Shunde Graduate School, University of Science and Technology Beijing, Foshan, Guangdong 528399, China
Shaosheng Li
Affiliation:
School of Artificial Intelligence, Beijing University of Posts and Telecommunications, Beijing 100876, China
Xiaolong Yang
Affiliation:
School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China
*
Author for correspondence: Gaoya Dong, E-mail: gaoyadong@ustb.edu.cn
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Abstract

An Nth-order tunable bandpass filter (BPF) structure with extended passband bandwidth has been proposed in this paper based on the novel tunable resonator and coupling structure. The designed tunable resonator is composed of two coupled lines and one varactor diode, while the presented tunable coupling structure is constructed by two cascaded transmission lines and one short-circuited varactor diode. Moreover, the even-(odd-) method and lumped-element equivalent circuit are employed to analyze the operating mechanisms of the designed Nth-order tunable BPF. Specifically, the frequency tuning range is determined by the characteristic impedance and electrical length of coupled line when the varactor diode is within the fixed tuning range. Then, the design procedure for the Nth-order tunable BPFs is proposed. To demonstrate the presented idea, the second- and third-order fully tunable BPFs have been designed and simulated. Finally, a second-order tunable BPF with the compact size of 0.03λg × 0.13λg has been fabricated and measured, and the measured center frequencies are ranging from 0.91 to 1.46 GHz with the passband bandwidths wider than 11.2%.

Keywords

Coupled linesextended passband bandwidthtunable bandpass filterwide frequency tuning range
Type
Filters
Information
International Journal of Microwave and Wireless Technologies , Volume 14 , Issue 10 , December 2022 , pp. 1233 - 1240
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press in association with the European Microwave Association

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