Microwave and Optical Technology Letters

RESEARCH ARTICLE

Tunable balanced bandpass filter with wide frequency-tuning range and high selectivity

Corresponding Author

Hong Yang

[email protected]

National Digital Switching System Engineering and Technology R&D Center, Zhengzhou, China

Correspondence Hong Yang, National Digital Switching System Engineering and Technology R&D Center, Zhengzhou 450001, China.

Email: [email protected]

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Dewei Zhang,

Dewei Zhang

National Digital Switching System Engineering and Technology R&D Center, Zhengzhou, China

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Xian Wang,

Xian Wang

National Digital Switching System Engineering and Technology R&D Center, Zhengzhou, China

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Dalong Lv,

Dalong Lv

National Digital Switching System Engineering and Technology R&D Center, Zhengzhou, China

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Yi Zhang,

Yi Zhang

National Digital Switching System Engineering and Technology R&D Center, Zhengzhou, China

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Dongfang Zhou,

Dongfang Zhou

National Digital Switching System Engineering and Technology R&D Center, Zhengzhou, China

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Hong Yang,

Corresponding Author

Hong Yang

[email protected]

National Digital Switching System Engineering and Technology R&D Center, Zhengzhou, China

Correspondence Hong Yang, National Digital Switching System Engineering and Technology R&D Center, Zhengzhou 450001, China.

Email: [email protected]

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Dewei Zhang,

Dewei Zhang

National Digital Switching System Engineering and Technology R&D Center, Zhengzhou, China

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Xian Wang,

Xian Wang

National Digital Switching System Engineering and Technology R&D Center, Zhengzhou, China

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Dalong Lv,

Dalong Lv

National Digital Switching System Engineering and Technology R&D Center, Zhengzhou, China

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Yi Zhang,

Yi Zhang

National Digital Switching System Engineering and Technology R&D Center, Zhengzhou, China

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Dongfang Zhou,

Dongfang Zhou

National Digital Switching System Engineering and Technology R&D Center, Zhengzhou, China

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First published: 14 March 2022

https://doi.org/10.1002/mop.33210

Citations: 1

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Abstract

A tunable balanced bandpass filter (BPF) with a wide frequency-tuning range (FTR) and high selectivity is presented. The designed BPF is implemented by utilizing varactor-tuned square ring resonators (SRRs) with parallel-coupled feedlines. A wide FTR with an almost constant absolute bandwidth (CABW) can be realized by varactors C_v2 connected between SRRs. Four transmission zeros (TZs) can be obtained by the mixed electric and magnetic coupling, source-load (S-L) frequency-variant coupling, and four shunt quarter-wavelength open and short stubs. Meanwhile, two TZs on both sides of the passband keep the relative position unchanged to achieve high selectivity. The other two are generated to improve the out-band rejection. In addition, by employing additional stubs and capacitances on the symmetry plane, the common-mode (CM) suppression can be enhanced. For verification, a tunable balanced BPF with 0.62-1.27 GHz and four TZs was designed, manufactured, and tested. And experimental results agree well with the simulated ones.

Open Research

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Volume64, Issue5

May 2022

Pages 890-895

Tunable balanced bandpass filter with wide frequency-tuning range and high selectivity

Abstract

Open Research

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Tunable balanced bandpass filter with wide frequency-tuning range and high selectivity

Abstract

Open Research

DATA AVAILABILITY STATEMENT

REFERENCES

Citing Literature

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