A high selectivity quad-band bandpass filter based on hybrid-coupled microstrip/slotline quad-mode resonator

Chen, Hui; Zhao, Huapeng; Ke-song, Chen; Wu, Yunqiu; Pu, Tao; Zhong, Hongtao

doi:10.1080/09205071.2013.828574

Cited by 5 publications

(1 citation statement)

References 9 publications

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“…A dual-band BPF was realised by stacking two SLRs in [12]. A hybrid-coupled microstrip/slotline quad-mode resonator was proposed to design a quad-band BPF with high selectivity in [13]. As also shown in [14][15][16], microstrip SIRs (MSIRs) and DGSRs were incorporated to design multiband BPFs with independent microwave operating bands using the same feeding structure.…”

Section: Introductionmentioning

confidence: 99%

Tri-Band BPF With Six Transmission Zeros Based on Quad-Mode DGS Resonator and Msir

Peng¹,

Li²,

Deng³

2017

PIER C

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Abstract-This paper presents the comprehensive design and analysis of a tri-band bandpass filter (BPF) based on a novel quad-mode defected ground structure resonator (QMDGSR) fed by two 50 Ω microstrip lines under the source-load coupling condition. Four transmission zeros (TZs) are produced in the proposed tri-band bandpass structure with two TZs beside each passband. All the four TZs are thoroughly analysed using equivalent circuit models based on the even-/odd-mode theory, and the corresponding equation for extracting the frequency of each TZ is developed and verified. The bandwidths (BWs) of the 1st and 3rd operating bands are broadened by incorporating the proposed triband bandpass structure with a traditional microstrip stepped impedance resonator (MSIR). Also, two additional TZs are generated due to the coupling between the feeding lines and the newly incorporated MSIR, which significantly result in the passband selectivity improvement. The lower and upper stopband rejections of the fabricated prototype are as high as 83.3 and 43.9 dB, respectively.

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