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Compact dualband bandpass filter with two transmission zeros using dual‐mode microstrip resonator and tapped‐line geometry
Author(s) -
Yun TaeSoon,
Noh SunKuk,
Kim HyungJong,
Oh EuyKyo,
Son HongMin,
Lee JongChul
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.25627
Subject(s) - resonator , microstrip , band pass filter , helical resonator , dielectric resonator antenna , stub (electronics) , transmission line , electrical impedance , multi band device , electrical length , inverter , electrical engineering , optics , physics , electronic engineering , acoustics , engineering , microstrip antenna , slot antenna , voltage , antenna (radio)
In this article, the dualband bandpass filters (BPFs) using dual‐mode resonator are designed and implemented. Also, the J‐inverter is investigated as function of the impedance and the electrical length of the open‐stub in the dual‐mode λ g /2 microstrip resonator. Especially, the dualband BPFs using dual‐mode resonator are realized by the stepped impedance resonator (SIR) structure and have good out‐of‐band performance as the inverter is alternating by the coupling structure and tapped‐line geometry. The first transmission zero of the dualband BPFs is made by the dual‐mode resonator and the second transmission zero is defined by the open‐stub of the tapped‐line geometry as a function of J‐inverter. The dualband BPF using dual‐mode resonator with two transmission zeros shows the insertion losses of 1.92 and 1.71 dB at the center frequency of 2.42 and 5.65 GHz, respectively. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:108–111, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25627