Compact triple-band HTS filter with high selectivity using self-coupled stepped impedance resonator

Junjie Zhang; Dongfang Zhou; Dewei Zhang; Qing Liu

Compact triple-band HTS filter with high selectivity using self-coupled stepped impedance resonator

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Author(s): Junjie Zhang¹ ; Dongfang Zhou¹ ; Dewei Zhang¹ ; Qing Liu¹
- Affiliations: 1: Department of Electromagnetic Wave and Antenna Propagation , PLA Strategic Support Information Engineering University , Zhengzhou, Henan 450001 , People's Republic of China
Source: Volume 56, Issue 20, 30 September 2020, p. 1067 – 1069
DOI: 10.1049/el.2020.1803 , Print ISSN 0013-5194, Online ISSN 1350-911X

Received 15/06/2020, Published 19/08/2020

A compact triple-band high-temperature superconducting (HTS) filter with high selectivity based on self-coupled stepped impedance resonator is proposed in this Letter. By folding the two-opened arms of the λ/2 stepped impedance resonator, inter-resonator coupling has been evolved. Due to theoretical analysis of the resonator, the first three resonant frequencies are used to construct three passbands with controllable frequency ratios and bandwidths by changing coupling coefficient, impedance ratios and length ratio. Finally, a triple-band filter example with frequencies centred at 1.72/4.05/7.6 GHz (frequency ratios of 1:2.4:4.4) is designed, fabricated and tested, which has multiple transmission zeros and compact size. Good agreement between the simulated and the measured results validates the design method.

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Compact triple-band HTS filter with high selectivity using self-coupled stepped impedance resonator

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