Proposal of a fractal geometry with double similarity ratio for application in frequency selective surfaces with insensitive resonance frequency as a function of cell periodicity

Abstract

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.

Characterization of the koch fractal hexagonal loop frequency selective surface for X-band application

“…As the periodicity increased up to 8.0 mm, it affected the values of BW and which are 1.78 GHz (8.84 GHz ~ 10.62 GHz) and -27.54 dB, respectively. This is because the metal area in unit cell decrease, so the reflected power is lower, hence attenuation level in transmission is lower as well [25]. The simulated response for variation of ‗w' is depicted in Figure 6.…”