In this article, we proposed a new fractal geometry with double similarity for application in frequency selective surfaces (FSS) to obtain a structure insensitive to the resonance frequency as a periodicity function. Therefore, the bandwidth can changes only by changing the FSS periodicity, without any changes to the resonance frequency. Simulations were performed with the ANSYS HFSS commercial software and two prototypes were built for validation purposes. A good convergence between numerical and experimental results was obtained.

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