Volume 31, Issue 7 e22667
RESEARCH ARTICLE

A high selectivity dual-band bandpass filter using quadruple-mode multi-stub loaded ring resonator (SLRR)

Mingli Sun

Mingli Sun

School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, China

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Zhijiao Chen

Corresponding Author

Zhijiao Chen

School of Electronic Engineering, Beijng University of Posts and Telecommunications, Beijing, China

Correspondence

Zhijiao Chen, School of Electronic Engineering, Beijng University of Posts and Telecommunications, Beijing 100876, China.

Email: [email protected]

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Tao Zuo

Tao Zuo

China Electronics Technology Group Corporation, CETC Brainware Electronic Technology Co. Ltd, Hefei, China

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Zhaoyu Zuo

Zhaoyu Zuo

School of Physics, Xi'an Jiaotong University, Xi'an, China

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Anxue Zhang

Anxue Zhang

School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, China

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First published: 29 March 2021
Citations: 12

Funding information: International Cooperation Funds of Shanxi Province of China, Grant/Award Number: 2019KW-003; National Key Research and Development Program of China, Grant/Award Number: 2017YFE0128200; National Natural Science Foundation of China, Grant/Award Number: U1831201; Shanghai Aerospace Science and Technology Innovation Fund Project, Grant/Award Number: SAST2018-102

Abstract

A high selectivity dual-band filter is proposed based on the quadruple-mode multi-stub loaded ring resonator. The ring resonator can utmostly avoid bending the electromagnetic wave. Two external open stubs are employed to generate four transmission poles where the odd- and even-mode is utilized to analyze the resonant frequencies of the BPF. The internal stub effectively reduces the insert loss (IL) by improving the external quality factor Qe of the second passband. In addition, five transmission zeros are generated due to the multipath and self-resonance modes to improve the out-of-band selectivity of the proposed filter. The proposed filter centered at 2.65 and 4.84 GHz is designed, fabricated and measured. The simulated results agree well with the measured results.

DATA AVAILABILITY STATEMENT

Data are available and will be shared.

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