2nd Harmonic suppression in parallel-coupled microstrip bandpass filter by using koch fractals

Design of a folded miniaturized band pass filter using parallel-coupled half-wavelength microstrip resonators with improved stopband skirt characteristics and harmonic suppression is presented in this paper. The proposed filter has fractional bandwidth of 20% subject to design frequency of 5.25 GHz....

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Bibliographic Details
Published inAnnual IEEE India Conference pp. 1 - 6
Main Authors Das, Tarun Kumar, Chatteqee, Sayan
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.12.2016
Subjects
Band-pass filters
bandpass filter
Fractals
Harmonic analysis
harmonic suppression
Harmonics suppression
microstrip
Microstrip filters
Power harmonic filters
Resonator filters
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Summary:Design of a folded miniaturized band pass filter using parallel-coupled half-wavelength microstrip resonators with improved stopband skirt characteristics and harmonic suppression is presented in this paper. The proposed filter has fractional bandwidth of 20% subject to design frequency of 5.25 GHz. Koch fractal geometry has been employed in each section of coupled lines for improvement in bandwidth and harmonic suppression. Accordingly, 2 nd harmonic suppression of -36dB and size reduction of 58.4% is achieved compared to the conventional parallel-coupled bandpass filter. The folded structure is modified further to an in-line parallel-coupled filter structure in which 2 nd harmonic suppression of -34dB and size reduction of 72.1% has been achieved by using Fractals.
ISSN:2325-9418
DOI:10.1109/INDICON.2016.7838919