Abstract
This work presents a full-wave analysis of stable frequency selective surfaces (FSSs) composed of periodic arrays of cross fractal patch elements. The shapes of these patch elements are defined conforming to a fractal concept, where the generator fractal geometry is successively subdivided into parts which are smaller copies of the previous ones (defined as fractal levels). The main objective of this work is to investigate the performance of FSSs with cross fractal patch element geometries including their frequency response and stability in relation to both the angle of incidence and polarization of the plane wave. The frequency response of FSS structures is obtained using the wave concept iterative procedure (WCIP). This method is based on a wave concept formulation and the boundary conditions for the FSS structure. Prototypes were manufactured and measured to verify the WCIP model accuracy. A good agreement between WCIP and measured results was observed for the proposed cross fractal FSSs. In addition, these FSSs exhibited good angular stability.
Highlights
IntroductionFrequency selective surfaces (FSSs) are being designed for many applications in modern communication systems
Frequency selective surfaces (FSSs) are being designed for many applications in modern communication systems. They are used as spatial filters of electromagnetic waves and are composed of two-dimensional periodic arrays of metallic patch or aperture elements, behaving like band-stop or band-pass filters, respectively [1,2,3,4]
The first step of this work is search the best value for the array periodicity of the FSS geometry for a given frequency band
Summary
Frequency selective surfaces (FSSs) are being designed for many applications in modern communication systems. They are used as spatial filters of electromagnetic waves and are composed of two-dimensional periodic arrays of metallic patch or aperture elements, behaving like band-stop or band-pass filters, respectively [1,2,3,4]. FSSs are used to reflect or transmit electromagnetic waves according to their array geometry, resonant element type and shape, and other structural parameters. FSSs with aperture type elements are used to provide band-pass filter response with incident wave transmission at resonant frequencies. FSSs with metallic patch type elements are used to provide band-stop filter response with incident wave reflection at resonant frequencies [5, 6]
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