Application of the micro-genetic algorithm to the design of spatial filters with frequency-selective surfaces embedded in dielectric media

2002 ◽  
Vol 44 (2) ◽  
pp. 338-346 ◽  
Author(s):  
S. Chakravarty ◽  
R. Mittra
Keyword(s):  
Genetic Algorithm ◽  
Frequency Selective Surfaces ◽  
Spatial Filters ◽  
Dielectric Media ◽  
Micro Genetic Algorithm ◽  
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 Analysis of Frequency Selective with Nonlinear Antenna under Radiations of Bi-Frequency Waves Based on Genetic Algorithm

2016 ◽  
Vol 15 (7) ◽  
pp. 6914-6922 ◽  
Author(s):  
Mona Teimoory
Keyword(s):  
Genetic Algorithm ◽  
Harmonic Balance ◽  
Short Wavelength ◽  
Wave Length ◽  
Algorithm Analysis ◽  
Single Frequency ◽  
Frequency Selective Surfaces ◽  
Nonlinear Loads ◽  
Frequency Selective ◽  
Frequency Radiation

The more frequency radiation increases, the shorter becomes its wave length. The short wavelength, while hitting to some material, cause vibration and make change the positive and negative poles. As the most common way of genetic algorithm codification is using zero and one alphabet, genetic algorithm field is series of potential responses which are codified by some ways. Generally, the primitive population greatness has 30 or 100 members. In this study, genetic algorithm is applied for analyzing frequency selective surfaces with nonlinear antenna, in order to obtain two poles of nonlinear loads. It is worth to mention that two waves, with two different frequencies between 100 and 120 MHz, are radiated to antenna. The Ieq and Yin, in mentioned frequencies, are measured through FEKO software. Finally, after different analysis, it has been determined that in order to analyze selective surfaces, like harmonic balance, which are only capable of single frequency radiation, more global genetic algorithm analysis would be introduced for frequency selective surfaces.

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