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Coupled microstrip line bandpass filter with harmonic suppression using right‐angle triangle grooves
Author(s) -
Mohra Ashraf S.
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.24644
Subject(s) - band pass filter , microstrip , groove (engineering) , harmonic , spurious relationship , microwave , center frequency , filter (signal processing) , optics , passband , acoustics , materials science , electronic engineering , physics , topology (electrical circuits) , electrical engineering , engineering , telecommunications , mathematics , statistics , metallurgy
A single grooved coupled line bandpass filter with improved pass band response and first harmonic suppression is described. The suppression of the first spurious harmonic was done by using right‐angle triangle grooves in the middle of each of the coupled‐microstrip lines that construct the bandpass filter. As the number of grooves increase as the shift in the operating frequencies increase also, so it is suitable to use less numbers of grooves as possible. A three stage bandpass filter using coupled‐microstrip lines was designed, simulated, and realized to illustrate this idea. The simulated results illustrate a good performance for right‐angle triangle groove over the corresponding rectangular groove. The measured S‐parameters measurement of the realized bandpass filter shows the suppression of the second resonance frequency and less shift in the center frequency. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2313–2318, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24644