Optimization of chirped and tapered microstrip koch fractal electromagnetic band gap (KFEBG) structures for improved low-pass filter design
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SponsorsThis work was supported by the Ministerio de Economía y Competitividad of Spain and the European Regional Development Funds (TEC2013-47037-C5-5-R).
PublisherInstitutiom of Engineering and Technology (IET)
Bibliographic CitationRUIZ MARTÍNEZ, Juan de Dios, MARTÍNEZ VIVIENTE, Félix Lorenzo, HINOJOSA JIMÉNEZ, Juan. Optimization of chirped and tapered microstrip koch fractal electromagnetic band gap (KFEBG) structures for improved low-pass filter design. En: IET Microwaves, Antennas Propagation, vol. 9, n. 9, p. 889–897, 2015. ISSN: 1751-8725.
KeywordsElectromagnetic bandgap (EBG)
Koch fractal EBG (KFEBG)
This study presents electromagnetic bandgap (EBG) structures in microstrip technology based on onedimensional Koch fractal patterns (Koch fractal EBG (KFEBG)). This fractal geometry allows to adjust the radius r and distance a between patterns so that a low-pass filter response is obtained when the ratio r/a is higher than 0.5. However, in such case undesired strong ripples appear in the low bandpass region. We demonstrate that the performance in the passband of this filter can be improved by applying a tapering function to the Koch fractal dimensions and to the width of the microstrip line, while simultaneously chirping (modulating) the Koch fractal periodic pattern distance (a) so as to maintain a constant r/a ratio. Several tapering functions scaled by a factor K are presented, and the results of their application to the KFEBG microstrip structure are compared by means of relevant characteristic parameters. Optimal performance has been obtained for the Kaiser and Cauchy ...
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