Highly compact quad-band bandpass filter with flexibly controllable passbands

Fan Zhang; Yang Gao; Yi Wang; Yi Zhang; Yuliang Dong; Jun Xu

doi:10.1049/ell2.12023

Highly compact quad-band bandpass filter with flexibly controllable passbands

Fan Zhang, Yang Gao, Yi Wang, Yi Zhang, Yuliang Dong, Jun Xu

Electronic, Electrical and Systems Engineering

Research output: Contribution to journal › Letter › peer-review

Abstract

This letter reports a highly compact microstrip quad-band bandpass filter based on two folded λ/4 stepped impedance resonators and three folded dual-mode short stub-loaded resonators. The two stepped impedance resonators not only form the first passband but also serve as the feed structure and provide the source-load coupling path for the three higher passbands created by the short stub-loaded resonators. Thus, a compact size can be obtained, and three pairs of transmission zeros can be realised near the three higher passbands to improve the frequency selectivity. It has been shown that the centre frequencies and bandwidths of the four passbands can be controlled independently. A microstrip quad-band bandpass filter centred at 1.1/2.05/3/3.55 GHz is implemented and tested achieving an extremely small size of 0.07λ_g × 0.14λ_g, where λ_g is the guided wavelength at 1.1 GHz. This presents one of the smallest quad-band bandpass filter ever demonstrated in the literature.

Original language	English
Journal	Electronics Letters
DOIs	https://doi.org/10.1049/ell2.12023
Publication status	Accepted/In press - 5 Oct 2020

Bibliographical note

Publisher Copyright:
© 2021 The Authors. Electronics Letters published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology

ASJC Scopus subject areas

Electrical and Electronic Engineering

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10.1049/ell2.12023

Cite this

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title = "Highly compact quad-band bandpass filter with flexibly controllable passbands",

abstract = "This letter reports a highly compact microstrip quad-band bandpass filter based on two folded λ/4 stepped impedance resonators and three folded dual-mode short stub-loaded resonators. The two stepped impedance resonators not only form the first passband but also serve as the feed structure and provide the source-load coupling path for the three higher passbands created by the short stub-loaded resonators. Thus, a compact size can be obtained, and three pairs of transmission zeros can be realised near the three higher passbands to improve the frequency selectivity. It has been shown that the centre frequencies and bandwidths of the four passbands can be controlled independently. A microstrip quad-band bandpass filter centred at 1.1/2.05/3/3.55 GHz is implemented and tested achieving an extremely small size of 0.07λg × 0.14λg, where λg is the guided wavelength at 1.1 GHz. This presents one of the smallest quad-band bandpass filter ever demonstrated in the literature.",

author = "Fan Zhang and Yang Gao and Yi Wang and Yi Zhang and Yuliang Dong and Jun Xu",

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AU - Zhang, Fan

AU - Gao, Yang

AU - Wang, Yi

AU - Zhang, Yi

AU - Dong, Yuliang

AU - Xu, Jun

PY - 2020/10/5

Y1 - 2020/10/5

N2 - This letter reports a highly compact microstrip quad-band bandpass filter based on two folded λ/4 stepped impedance resonators and three folded dual-mode short stub-loaded resonators. The two stepped impedance resonators not only form the first passband but also serve as the feed structure and provide the source-load coupling path for the three higher passbands created by the short stub-loaded resonators. Thus, a compact size can be obtained, and three pairs of transmission zeros can be realised near the three higher passbands to improve the frequency selectivity. It has been shown that the centre frequencies and bandwidths of the four passbands can be controlled independently. A microstrip quad-band bandpass filter centred at 1.1/2.05/3/3.55 GHz is implemented and tested achieving an extremely small size of 0.07λg × 0.14λg, where λg is the guided wavelength at 1.1 GHz. This presents one of the smallest quad-band bandpass filter ever demonstrated in the literature.

AB - This letter reports a highly compact microstrip quad-band bandpass filter based on two folded λ/4 stepped impedance resonators and three folded dual-mode short stub-loaded resonators. The two stepped impedance resonators not only form the first passband but also serve as the feed structure and provide the source-load coupling path for the three higher passbands created by the short stub-loaded resonators. Thus, a compact size can be obtained, and three pairs of transmission zeros can be realised near the three higher passbands to improve the frequency selectivity. It has been shown that the centre frequencies and bandwidths of the four passbands can be controlled independently. A microstrip quad-band bandpass filter centred at 1.1/2.05/3/3.55 GHz is implemented and tested achieving an extremely small size of 0.07λg × 0.14λg, where λg is the guided wavelength at 1.1 GHz. This presents one of the smallest quad-band bandpass filter ever demonstrated in the literature.

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Highly compact quad-band bandpass filter with flexibly controllable passbands

Abstract

Bibliographical note

ASJC Scopus subject areas

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