Stable and compact multiband frequency selective surfaces with Peano pre‐fractal configurations

Abstract

This work presents a fractal design methodology for frequency selective surfaces (FSSs) with Peano pre‐fractal patch elements. The proposed FSS structures are composed of periodic arrays of metallic patches printed on a single‐layer fibreglass dielectric. The shapes presented by pre‐fractal patches allow one to design compact FSSs that behave like dual‐polarised band‐stop spatial filters. On the other side, the space‐filling and self‐similarity properties of Peano fractals became possible various configurations for patch elements. An FSS parametric analysis is performed in terms of the fractal iteration‐number and cell‐size of pre‐fractal patches. To validate the used methodology four FSS prototypes are built and tested in the range from 1.0 to 13.5 GHz. Experimental characterisation of the FSS prototypes is accomplished through three different measurement setups with commercial horns and circular monopole microstrip antennas. Results show that the proposed FSS presents most of the desired features for spatial filters: compact design, multiband responses, dual‐polarisation, excellent angular stability and facility for reconfiguration.

A dual-band fractal FSS with SZ curve elements

“…The fractal SZ curve of second generation can be utilized to achieve multiband, however, the frequency bands except the first band are generally unstable for oblique incidence. It can be ascertained that the second SZ curve element can provide a frequency band with great angular stability [11]. Therefore, in order to produce another resonance with stable performance, an improvement on the basis of original structure is proposed, the center cross patch is intentionally removed from the original structure, so that the four separate SZ curves are connected together to form a meandered aperture unit.…”

Reconfigurable and stable frequency selective surfaces on nonuniform and finite arrays

“…Recently, FSS have been widely used in microwave and millimetre‐wave circuit designs applying in antenna devices, radomes, impedance surfaces, and absorbers, for example. Particularly, frequency selective surfaces are used to control the transmission and reflection properties of the incident plane wave …”

“…Particularly, frequency selective surfaces are used to control the transmission and reflection properties of the incident plane wave. [1][2][3][4][5] At the resonant frequency of the FSS structure, the conducting patches reflect the energy applied to the surface acting as a selective reject band filter. If the FSS is formed by aperture elements it will behave as a band pass filter, in the frequency range around the resonance frequency.…”

Simple, Compact, and Multiband Frequency Selective Surfaces Using Dissimilar Sierpinski Fractal Elements

“…The use of fractal patch geometries as conducting elements on a FSS periodic design has provided superior performance, for some applications, compared to those using typical patch geometries, such as rectangular, square, circular, dipole, cross-dipole, and square loop [1][2][3]. For example, geometric fractals can be used to design single-layer FSSs with high frequency compression factors, ensuring the manufacture of compact devices [4][5][6][7]. A FSS with high frequency compression factor is referred to as compact.…”