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Compact dual‐band bandpass filter using uniform‐impedance resonators and dual‐mode resonator
Author(s) -
Xu Jin,
Zhu ChuanMing
Publication year - 2016
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.29847
Subject(s) - passband , resonator , band pass filter , multi band device , coupling (piping) , optoelectronics , materials science , microwave , helical resonator , dielectric resonator antenna , electrical impedance , physics , electrical engineering , electronic engineering , acoustics , optics , engineering , telecommunications , antenna (radio) , metallurgy
This article presents a compact dual‐band bandpass filter (BPF) using a pair of one‐end shorted uniform‐impedance resonators (SUIRs) and a single dual‐mode resonator (DMR). A pair of SUIRs with mixed electric and magnetic coupling (MEMC) not only realizes the lower passband but also serves as the feeding lines with source‐load coupling to excite the DMR to produce the upper passband. Four transmission zeros due to the cancelling effect of MEMC, harmonic effect, source‐load coupling, and inherent property of DMR improve the passband selectivity, band‐to‐band isolation, and out‐of‐band rejection. As an example, a dual‐band BPF operating at 1.57/2.4 GHz with compact size of 0.1λ g × 0.127λ g is designed and fabricated. The simulation agrees very well with measurement. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1537–1540, 2016