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Harmonic suppression of bandpass filters using open‐circuited stubs
Author(s) -
Chen LihShan,
Lin WenJeng,
Huang TsungHui,
Houng MauPhon,
Fu ShenLi
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.23226
Subject(s) - band pass filter , passband , center frequency , voltage controlled filter , high pass filter , electronic engineering , bandwidth (computing) , microwave , stub (electronics) , band stop filter , prototype filter , harmonic , electronic filter topology , spurious relationship , materials science , acoustics , engineering , low pass filter , physics , telecommunications , computer science , machine learning
In this article, a cascaded bandstop filter using quarter‐wavelength open‐circuited stub structure is employed to suppress the spurious passband at the second harmonic of the bandpass filter. The center frequency of the fabricated bandpass filter is at 0.9 GHz and the fractional bandwidth is 5%. The proposed bandpass filter shows 30 dB rejection at the second harmonic during the frequency range from 1.1 to 10 GHz. The measured frequency responses of the fabricated filter are in agreement with simulated results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 863–865, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23226