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Compact and high selectivity broadband bandpass filter with dual‐mode folded‐T‐type resonator
Author(s) -
Deng HongWei,
Zhao YongJiu,
Zhang XueShun,
Chen Wen,
Qiang Li
Publication year - 2011
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.26108
Subject(s) - stopband , band pass filter , resonator , broadband , stub (electronics) , passband , bandwidth (computing) , center frequency , microwave , physics , materials science , microstrip , optoelectronics , electronic engineering , optics , engineering , telecommunications
A broadband bandpass filter (BPF) with compact size and high selectivity performances is proposed using the dual‐mode folded‐T‐type resonator and the identical short stub loaded parallel‐coupling feed structure.The resonator can generate one even‐mode and one odd‐mode in the desired band. Two resonant frequencies can be adjusted easily to satisfy the bandwidth of the BPF. The feed structure can generate four transmission zeros near the cutoff frequencies and in the stopband, leading to sharp skirt and deep stopband. One filter prototype with the fractional bandwidth of 58.89% is fabricated for experimental verification of the predicted results. The size for the resonator is only 0.156λ g × 0.303λ g in which λ g is the guided wavelength of 50 Ω microstrip line at the center frequency. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26108