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Microstrip dual‐band bandpass filter using slow‐wave resonators for WLAN applications
Author(s) -
Guan Xuehui,
Ma Zhewang,
Cai Peng,
Anada Tetsuo,
Hagiwara Gen
Publication year - 2007
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.22055
Subject(s) - band pass filter , resonator , microstrip , passband , electronic engineering , stub (electronics) , multi band device , harmonics , engineering , electrical engineering , acoustics , physics , voltage , antenna (radio)
A dual‐band bandpass filter using microstrip slow‐wave resonators is developed for wireless local area network applications. The fundamental and higher order resonant harmonics of a microstrip open‐loop resonator are analyzed against the length of the loading open stub. Then a dual‐band bandpass filters is designed in the form of slow‐wave open‐loop resonators. A zero‐degree feed structure is employed to produce transmission zeros near the passband to increase the rate of attenuations, and a quarter‐wavelength feed line for impedance matching is added to get desired external quality factor at the input and output. The theoretical analysis and design procedures are successfully verified by experimental results. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 14–16, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22055