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Tunable dual‐band bandpass filter for WLAN applications
Author(s) -
Girbau David,
Lázaro Antonio,
Martínez Esther,
Masone Diego,
Pradell Lluís
Publication year - 2009
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.24550
Subject(s) - multi band device , passband , band pass filter , wi fi , operability , microwave , resonator , electronic engineering , electrical engineering , wireless , center frequency , engineering , telecommunications , wireless network , antenna (radio) , reliability engineering
This article proposes the design of tunable dual‐band filters for multiband multistandard systems, specifically for wireless local‐area network applications. The two main goals are to provide frequency tunability in the second band while maintaining the first band fixed and to obtain a structure capable of offering a ratio between the second and first passband center frequencies larger than 2. To this end, a capacitively loaded stepped‐impedance resonator is proposed for integration in dual‐band filters. A detailed analysis of the resonator is provided. A filter has been designed to validate the concept. It demonstrates operability in wireless local‐area network frequency bands, with a fixed first band at 2.45 GHz and a second band which can be tuned between 5.75 GHz and 5.25 GHz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2025–2028, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24550