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Compact dual‐band filter design using crossly coupled λ/4 SIRs embedded with spur‐line for WLAN applications
Author(s) -
Chen PowWen,
Ho MinHua,
Hong Wanchu
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.23846
Subject(s) - stopband , passband , spur , electronic engineering , band pass filter , resonator , multi band device , engineering , microwave , insertion loss , filter (signal processing) , attenuation , band stop filter , electrical impedance , line (geometry) , electrical engineering , low pass filter , telecommunications , physics , optics , structural engineering , mathematics , antenna (radio) , geometry
This article presents a compact dual‐band bandpass filter (BPF) design using λ/4 stepped impedance resonators (SIRs) embedded with spur‐line for the WLAN applications. The filter covers both the operating frequencies of 2.45 GHz and 5.2–5.8 GHz. The crossly coupled mechanism is used in the filter design to provide attenuation poles by the passband edges for enhancing the signal selectivity and increasing stopband rejection levels. The tapped‐line is incorporated in feed structure to save the circuit space. The spur‐line is embedded in each I/O SIRs to push the upper stopband limit to a higher frequency. Experiments are conducted to verify the circuit performance. A good agreement is observed between the simulation and the measurement. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2807–2810, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23846