Miniaturized tri-band balanced filter based on a novel asymmetric stepped impedance resonator with self-coupling

Zhang Junjie; Li Jianbing; Zhou Dongfang; Liu Qing; Wang Xian; Zhang Dewei

doi:10.11884/HPLPB202133.200153

Volume 33 Issue 2

Jan. 2021

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Zhang Junjie, Li Jianbing, Zhou Dongfang, et al. Miniaturized tri-band balanced filter based on a novel asymmetric stepped impedance resonator with self-coupling[J]. High Power Laser and Particle Beams, 2021, 33: 023006. doi: 10.11884/HPLPB202133.200153

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Zhang Junjie, Li Jianbing, Zhou Dongfang, et al. Miniaturized tri-band balanced filter based on a novel asymmetric stepped impedance resonator with self-coupling[J]. High Power Laser and Particle Beams, 2021, 33: 023006. doi: 10.11884/HPLPB202133.200153

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Miniaturized tri-band balanced filter based on a novel asymmetric stepped impedance resonator with self-coupling

doi: 10.11884/HPLPB202133.200153

PLA Strategic Support Force Information Engineering University, Zhengzhou 450001, China

Received Date: 2020-06-04
Rev Recd Date: 2020-11-11
Publish Date: 2021-01-07

Abstract

Abstract

For the application requirements of high integration and high selectivity of balanced filters, this paper proposes a novel balanced tri-band filter with high selectivity, which is based on an improved asymmetric stepped impedance resonator structure with self-coupling. Firstly, through the differential mode and common mode equivalent circuits of the balanced filter, the resonant characteristics of the resonator structure are specifically analyzed, and the first three resonance modes under the differential mode equivalent circuit are used to form three passbands respectively. In addition, by loading capacitors and resistance elements on the symmetrical surface of the circuit, the suppression of CM signals can be improved without affecting DM signals based on the proposed multimode balanced filter structure and design method, and a balanced tri-band filter with passband frequencies of 2.75/4.46/6.21 GHz was designed, processed and tested. The results show that the structure can achieve a compact size and high selection characteristics, and has good common mode rejection characteristics.
- balanced filter,
- tri-band,
- common-mode (CM) suppression,
- self-coupling,
- asymmetric stepped impedance resonator

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References(15)

References

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