1D Koch fractal electromagnetic bandgap microstrip structures with r/a ratios higher than 0.5

A 1D Koch fractal electromagnetic bandgap (KFEBG) microstrip structure is proposed.It is conceived by replacing the conventional holes etched in the ground plane of a microstrip line by level-1 Koch fractal cell geometries, which have been obtained from a hexagonal shape. In the case of the conventional 1D electromagnetic bandgap (EBG) microstrip structure with periodic hole pattern, the design is limited to r/a ratios lower than 0.45, whereas the proposed pattern allows achieving r/a ratios higher than 0.5. It is shown that the conventional EBG and KFEBG microstrip structures behave as a stopband filter as r/a 0.5 can be useful for the design of low-pass filters. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:646–649, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25763

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