Premium
Design of spur‐line‐loaded cross‐coupled dual‐band bandpass filter with wide upper‐end stopband
Author(s) -
Hsieh YiHuan,
Lee ChingHer,
Hsu ChungI. G.
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.23186
Subject(s) - stopband , passband , band pass filter , resonator , spurious relationship , harmonics , microwave , electronic engineering , band stop filter , elliptic filter , engineering , acoustics , filter (signal processing) , physics , electrical engineering , low pass filter , telecommunications , computer science , voltage , machine learning
This article presents the design of a compact fourth‐order cross‐coupled dual‐band bandpass filter (BPF) having a wide upper‐end stopband. Quarter‐wavelength ( λ /4) stepped‐impedance resonators (SIRs) were employed to construct the BPF to have a relatively small circuit size and high spurious harmonics, as compared with the BPF using half‐wavelength ( λ /2) SIRs. The resonators tapped by the input and output feeding lines were loaded by a spur‐line to suppress the first spurious passband so as to further broaden the upper‐end stopband. BPFs with and without the embedded spur‐lines were both simulated to compare their frequency responses. Very good agreement between the simulated and measured results was observed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 691–694, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23186