A Novel Fractal Geometry for Harmonic Suppression in Parallel Coupled-Line Microstrip BandPass Filter
In this paper,we present novel fractal geometry for suppression of second,third and fourth harmonicsInparallel coupled-line microstrip bandpass filter (PCLM-BPF). This new fractal geometry is obtained by finding the best shape for fractal generator curve using genetic algorithm. The PCML-BPF design is initiated using a classical methodology and is finalized by modification of the line-edges with the new fractal geometry.Therefore it is easy to design and fabricate this kind of filter. To validateThis novel geometry,third-order Butterworth bandpass filter have been designed and fabricated at 2.5 GHz with a 10％ fractional bandwidth on RO3003 substrate. The numerical and experimental result of this new geometry,confirms that there is 5dB more decrease on second,18dB on third and equal decrease on forth harmonic compared to Koch fractal geometry and about 45dB on 2(nd),12dB on 3(rd) and 32dB on 4(th)Incomparison with the conventional filter. Unlike the Koch fractal geometry which increases the magnitude of the third harmonic even than conventional filter our new fractal geometry decreases the magnitude of This harmonic.
H.Karimi zarajabad S.Nikmehr
Department of Electrical and Computer Engineering,University of Tabriz,Tabriz,Iran
国际会议
2008 International Conference on Microwave and Millimeter Wave Technology(2008国际微波毫米波技术会议)
南京
英文
1251-1254
2008-04-21（万方平台首次上网日期，不代表论文的发表时间）