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A triple-wideband bandpass filter with controllable bandwidths based on stub-loaded resonators

Published online by Cambridge University Press:  18 June 2018

Li Gong
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
Yang Xiong
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
Fan Zhang
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
LiTian Wang
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
Yan Sun
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
XinJie Zhao
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
Ming He
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
Lu Ji
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
Xu Zhang
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
Bo Zhang
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
Corresponding
E-mail address:

Abstract

In this paper, a triple-wideband bandpass filter (BPF) with controllable bandwidths based on two multi-mode stub-loaded resonators (MMSLRs) and a triple-mode resonator is presented. The MMSLR is loaded with two identical folded open-ended stubs and a T-shaped stub. Each passband of the tri-band BPF is formed by four resonant modes, which provide sufficient bandwidths to meet various application requirement. By adjusting the lengths of open-ended stubs, three passband bandwidths can be controlled individually. The center frequencies of the triple-wideband BPF are allocated at 2.7, 3.67, and 5.44 GHz, with the 3 dB fractional bandwidths (FBWs) of 20.1, 14.7, and 26.3%. Among the three passbands, the highest one covers the 5 G WiFi band (5.15–5.85 GHz). The measured results of the proposed filter exhibit excellent agreement with simulated results.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2018 

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References

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