Abstract
The spectacular development of frequency selective surfaces (FSS) as a spatial filter, absorbers and reflectors made them feasible for the aerospace and defence applications. The intervention of substrate integrated waveguide (SIW) technology into FSS results in the improvement of unit cell structures and better performance by isolating them from inter-element interference. Such FSS structures with SIW cavities upholds the FSS properties and improves their selectivity and performance. Considering the diversity in applications of introducing SIW cavity technology into FSS, the aim of this paper is to furnish a study on the glimpse of EM design techniques to analyze this type of structures. Design topologies of narrowing bandwidth, dual resonance, the design of FSS with sharp sideband edges and frequency selective polarization rotating structures are presented. Further, a novel design for improving the bandwidth of reflective FSS is discussed based on SIW technology. Fabrication techniques pertaining to this type of structures are presented in brief.
Highlights
Frequency selective surfaces (FSS) are periodic structures either in 2D or 3D, popularly used in the spatial filtering of electromagnetic (EM) waves
This method instantly approximates the differential operators in the Maxwell curl equations, on a grid staggered in time and space
This paper has presented the glimpse of design techniques and applications of FSS based on substrate integrated waveguide (SIW) cavity technology: this includes recent advances in the field of spatial filtering, and FSS design using SIW cavity technology
Summary
Frequency selective surfaces (FSS) are periodic structures either in 2D or 3D, popularly used in the spatial filtering of electromagnetic (EM) waves. It is expected to provide a stable resonance at different impinging of EM waves with wall structure, but that is not obtained using conventional FSS. To address this problem a loaded lumped elements in FSS is proposed [17], [18]. FSS with sharp transition sidebands at lower and higher frequencies can be achieved by slightly adjusting the coupling magnitude between two resonances This performance, to get an FSS with two different SIW cavities cascading and shunting [30], [31]. The glimpse of these methods is y discussed
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