Journal
ELECTRONICS LETTERS
Volume 55, Issue 1, Pages 38-39Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/el.2018.6702
Keywords
resonator filters; microstrip filters; band-pass filters; microwave filters; UHF filters; microwave resonators; UHF resonators; dual-band BPF; controllable passbands; dual passbands; modified quarter-wavelength stepped-impedance resonator; /4 SIRs; miniature dual-band bandpass filter design; independent geometrical parameters; coupling strengths; centre frequencies; multiple transmission zeros; source-load coupling; frequency 5; 8 GHz; frequency 2; 35 GHz
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Funding
- Japan Society for the Promotion of Science [17K06373]
- National Science Foundation of China [U1831201, 61761018]
- Natural Science Foundation of Jiangxi Province
- Young Scientific Research Project of Jiangxi Province Education Department of China [20171BAB212003, 20171ACB20019]
- [GJJ170415]
- Grants-in-Aid for Scientific Research [17K06373] Funding Source: KAKEN
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A modified quarter-wavelength (/4) stepped-impedance resonator (SIR) is proposed to design a miniature dual-band bandpass filter (BPF). The proposed /4 SIR has two individually controllable resonances for constructing dual passbands. Moreover, two independent geometrical parameters are adopted to realise individual adjustment of the coupling strengths between two adjacent /4 SIRs at the dual passbands. As a result, both the centre frequencies and bandwidths of the two passbands of the filter can be individually designed. Furthermore, multiple transmission zeros are created by the introduced source-load coupling, which improves highly the selectivity of both passbands. The dual-band BPF is designed at 2.35 and 5.8 GHz, and its simulated and measured responses are presented and show good agreement.
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