scholarly journals Frequency selective surfaces as spatial filters: Fundamentals, analysis and applications

2021 ◽  
Author(s):  
Ankush Kapoor ◽  
Ranjan Mishra ◽  
Pradeep Kumar
Keyword(s):  
Frequency Selective Surfaces ◽  
Spatial Filters ◽  
Frequency Selective

scholarly journals Continuous-range tunable multilayer frequency-selective surfaces using origami and inkjet printing

2018 ◽  
Vol 115 (52) ◽  
pp. 13210-13215 ◽  
Author(s):  
Syed Abdullah Nauroze ◽  
Larissa S. Novelino ◽  
Manos M. Tentzeris ◽  
Glaucio H. Paulino
Keyword(s):  
Low Cost ◽  
Frequency Selective Surfaces ◽  
Angle Of Incidence ◽  
Spatial Filters ◽  
Continuous State ◽  
Subtractive Manufacturing ◽  
Time Requirements ◽  
Frequency Selective ◽  
Tunable Frequency ◽  
Electrical Components

The tremendous increase in the number of components in typical electrical and communication modules requires low-cost, flexible and multifunctional sensing, energy harvesting, and communication modules that can readily reconfigure, depending on changes in their environment. Current subtractive manufacturing-based reconfigurable systems offer limited flexibility (limited finite number of discrete reconfiguration states) and have high fabrication cost and time requirements. Thus, this paper introduces an approach to solve the problem by combining additive manufacturing and origami principles to realize tunable electrical components that can be reconfigured over continuous-state ranges from folded (compact) to unfolded (large surface) configurations. Special “bridge-like” structures are introduced along the traces that increase their flexibility, thereby avoiding breakage during folding. These techniques allow creating truly flexible conductive traces that can maintain high conductivity even for large bending angles, further enhancing the states of reconfigurability. To demonstrate the idea, a Miura-Ori pattern is used to fabricate spatial filters—frequency-selective surfaces (FSSs) with dipole resonant elements placed along the fold lines. The electrical length of the dipole elements in these structures changes when the Miura-Ori is folded, which facilitates tunable frequency response for the proposed shape-reconfigurable FSS structure. Higher-order spatial filters are realized by creating multilayer Miura-FSS configurations, which further increase the overall bandwidth of the structure. Such multilayer Miura-FSS structures feature the unprecedented capability of on-the-fly reconfigurability to different specifications (multiple bands, broadband/narrowband bandwidth, wide angle of incidence rejection), requiring neither specialized substrates nor highly complex electronics, holding frames, or fabrication processes.

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

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Clarissa de Lucena Nóbrega ◽  
Marcelo Ribeiro da Silva ◽  
Paulo Henrique da Fonseca Silva ◽  
Adaildo Gomes D’Assunção ◽  
Gláucio Lima Siqueira
Keyword(s):  
High Frequency ◽  
Design Methodology ◽  
Frequency Tuning ◽  
Microstrip Antennas ◽  
Frequency Selective Surfaces ◽  
Experimental Characterization ◽  
Spatial Filters ◽  
Frequency Responses ◽  
Frequency Selective

This paper presents a design methodology for frequency selective surfaces (FSSs) using metallic patches with dissimilar Sierpinski fractal elements. The transmission properties of the spatial filters are investigated for FSS structures composed of two alternately integrated dissimilar Sierpinski fractal elements, corresponding to fractal levelsk=1, 2, and 3. Two FSS prototypes are fabricated and measured in the range from 2 to 12 GHz to validate the proposed fractal designs. The FSSs with dissimilar Sierpinski fractal patch elements are printed on RT/Duroid 6202 high frequency laminate. The experimental characterization of the FSS prototypes is accomplished through two different measurement setups composed of commercial horns and elliptical monopole microstrip antennas. The obtained results confirm the compactness and multiband performance of the proposed FSS geometries, caused by the integration of dissimilar fractal element. In addition, the proposed FSSs exhibited frequency tuning ability on the multiband frequency responses. Agreement between simulated and measured results is reported.

scholarly journals Analysis and Characterization of Finite-size Curved Frequency Selective Surfaces

2015 ◽  
Vol 2 (1) ◽  
pp. 9 ◽  
Author(s):  
Francesco Mattiello ◽  
Giovanni Leone ◽  
Giuseppe Ruvio
Keyword(s):  
High Performance ◽  
Finite Size ◽  
Frequency Selective Surfaces ◽  
Spatial Filters ◽  
Planar Structures ◽  
Significant Research ◽  
Planar Array ◽  
Band Pass ◽  
Infrared Wavelengths ◽  
Frequency Selective

Frequency Selective Surfaces (FSSs) are spatial filters that are largely employed in radomes for radars and antennas where high performance is necessary. FSS can be categorised in terms of their frequency behaviour. Band-pass FSS structures are able to let the electromagnetic wave pass in certain frequency ranges and shield others, which are especially suitable for out-of-band stealth of radomes. The properties of frequency selectiveness of these screens are used at microwave and infrared wavelengths. By tuning the electrical size and geometry of the unit-cell (patch or aperture) different frequency behaviours of the structure are generated. Although their analysis and simulation is significantly simplified with the approximation of infinite and planar array, in some real applications FSS are required to be conformal to limited non-planar structures. The literature on the problem of characterizing finite-size and curved FSS has been sparse and more focused on the single application rather than on a unified approach. In the aim of synthesizing valuable techniques, this paper reviews significant research results on truncated and curved FSS which were presented in the dedicated literature.

scholarly journals Frequency Selective Surfaces: A Review

2018 ◽  
Vol 8 (9) ◽  
pp. 1689 ◽  
Author(s):  
Rana Anwar ◽  
Lingfeng Mao ◽  
Huansheng Ning
Keyword(s):  
Experimental Studies ◽  
Dielectric Substrate ◽  
Structure Design ◽  
Array Element ◽  
Frequency Selective Surfaces ◽  
Spatial Filters ◽  
Practical Applications ◽  
Significant Performance ◽  
Frequency Selective ◽  
Microwave Regime

The intent of this paper is to provide an overview of basic concepts, types, techniques, and experimental studies of the current state-of-the-art Frequency Selective Surfaces (FSSs). FSS is a periodic surface with identical two-dimensional arrays of elements arranged on a dielectric substrate. An incoming plane wave will either be transmitted (passband) or reflected back (stopband), completely or partially, depending on the nature of array element. This occurs when the frequency of electromagnetic (EM) wave matches with the resonant frequency of the FSS elements. Therefore, an FSS is capable of passing or blocking the EM waves of certain range of frequencies in the free space; consequently, identified as spatial filters. Nowadays, FSSs have been studied comprehensively and huge growth is perceived in the field of its designing and implementation for different practical applications at frequency ranges of microwave to optical. In this review article, we illustrate the recent researches on different categories of FSSs based on structure design, array element used, and applications. We also focus on theoretical breakthroughs with fabrication techniques, experimental verifications of design examples as well as prospects and challenges, especially in the microwave regime. We emphasize their significant performance parameters, particularly focusing on how advancement in this field could facilitate innovation in advanced electromagnetics.

Nonuniformly illuminated frequency-selective surfaces

1988 ◽  
Vol 24 (14) ◽  
pp. 901 ◽  
Author(s):  
A.M.M.A. Allam ◽  
E.A. Parker
Keyword(s):  
Frequency Selective Surfaces ◽  
Frequency Selective
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