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Design of compact microstrip dual‐band bandpass filters with λ/4 stepped‐impedance resonators
Author(s) -
Jhuang HeKai,
Lee ChingHer,
Hsu ChungI. G.
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.22094
Subject(s) - band pass filter , resonator , microstrip , microwave , electronic engineering , spurious relationship , passband , electrical impedance , filter (signal processing) , engineering , multi band device , acoustics , electrical engineering , physics , telecommunications , computer science , machine learning , antenna (radio)
This article presents a compact microstrip bandpass filter (BPF) design for the 2.45 and 5.25 GHz wireless local‐area network (WLAN) applications. U‐shaped quarter‐wavelength stepped‐impedance resonators (λ/4 SIRs), for which the circuit size is small and the second resonant frequency can be tuned over a wide range, are adopted in the BPF design. It is shown that the first spurious passbands of the resultant filters are farther away from their second passbands than are those of the corresponding filters using half‐wavelength SIRs. Experiments on a second‐order and a fourth‐order BPF are conducted for validating the filter performance. Good agreement between the measured and the simulated results are observed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 164–168, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22094