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Dual‐band filter design of combined half and quarter wavelength SIRs for WLAN applications
Author(s) -
Chen PowWen,
Ho HaoHung,
Ho MinHua,
Lee ChingHer
Publication year - 2008
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.22979
Subject(s) - stopband , electronic engineering , band stop filter , microwave , band pass filter , engineering , m derived filter , electronic filter topology , voltage controlled filter , electrical engineering , butterworth filter , bandwidth (computing) , filter (signal processing) , prototype filter , resonator , filter design , telecommunications , low pass filter
This article presents a dual‐band bandpass filter composed of λ/2 and λ/4 stepped impedance resonators for the wireless local area network applications. The filter covers both the operating frequencies of 2.45 GHz and 5.2‐5.8 GHz. The doubly parallel‐coupling mechanism is used in the filter design to reduce the insertion losses and to gain a wider bandwidth. The cross coupling configuration and the tapped‐line I/O feed are adopted in this filter design to provide the attenuation poles for improving the signal selectivity and stopband rejection levels. Experiments were conducted to verify the circuit performance. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 13–15, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22979