A simple fractal geometry to design multiband frequency selective surfaces

Abstract

This article presents simulation and experimental investigation of a frequency‐selective surface (FSS) using simple fractal geometry. The geometry used in design of multiband FSS was the fractal spiral element (FSE). Simulated results obtained to fractals FSS were compared with measured results. Three structures were designed with FSE Levels 4, 5, and 6. These entire structures act like stop‐band filters with multiband response. Both simulation and experimental investigations were done. Simulation investigation was performed using the Ansoft Designer™ software. Experimental investigation was performed using an Agilent Technologies vector network analyzer—model N5230A. A good agreement between the results was obtained. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54: 2321–2325, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27045

Aplicação de Curvas Fractais em Elementos Convolucionados para Projeto de FSS Miniaturizada com Estabilidade Angular

“…A FSS proposta consiste em quatro elementos espirais semelhantes ao fractal apresentado em [13] conectados no meio da célula unitária, simetricamente. Esse projeto espiral em forma de fractal compacto fornece mais flexibilidade, porque podemos usar parâmetros fractais e características físicas da estrutura, para obter uma resposta em frequência desejada.…”

“…Isso facilita o processo construtivo da estrutura. A técnica FSE de contorno quadrado aplicada usa a seguinte regra de formação [13] Célula unitária da geometria proposta.…”

A Novel Dual-Passband Net-Shaped FSS Structure Used for Mimo Antennas

“…The main parameters that will determine the overall frequency response of an FSS include dielectric substrate properties, element shape geometry, inter-element spacing (cell-size or periodicity) and incidence angle of spatial waves on the surface [4][5][6][7]. Different FSS structures have been investigated by microwave engineers in the development of high performance spatial filters, such as reconfigurable frequency selective surfaces [11][12][13][14], multilayered selective filters [8], periodic arrays on anisotropic substrates [9,10], and FSSs with geometric fractal elements [15][16][17][18][19].…”

Multiband Frequency Selective Surfaces with Simple Modification of a Rectangular Patch Element

“…Different multiband FSS approaches can be found in literature. Most of them are results of one or a combination of several techniques, such as combined elements, complex elements, fractal elements, multilayered FSS .…”