Enhanced wideband performance of coupled frequency selective surfaces using metaheuristics

Abstract

This article presents a bandwidth optimization study of two coupled frequency selective surfaces (FSS).The optimization is performed in two steps. In the first step, a genetic algorithm is developed to synthesize two single FSS crossed dipoles with resonant frequencies equal to 9.5 and 10.5 GHz, to be used in a broadside coupled geometry, separated by an air gap. In the second step, a particle swarm optimization algorithm is developed to determine the optimal value for the air gap length to optimize the geometry bandwidth. Prototypes are fabricated and measured to validate the optimization study results for the two coupled FSS structure. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:711–715, 2013; View this article online at wileyonlinelibrary.com. DOI: 10.1002/mop.27451

A Wideband Frequency Selective Surface Reflector for 4g/X-Band/Ku-Band

“…The little variation in the measured results is due to the edge reflections and scattering of EM waves at the time of measurement. Table 4 shows the comparison of performance of proposed design with already existing designs [5,14]. It is clear from the table that a comparatively wider stopband is obtained from the proposed design in comparison to [5] and [14].…”

A Dual Layer Frequency Selective Surface Reflector for Wideband Applications

“…4. It can be seen that the proposed design is compact and gives a wider bandwidth than the structures in [18] and [19] but with two layers of FSS unlike that in [18]. The proposed FSS shows better angular stability than [18] though it is polarization dependent and in terms of spacing between the layers it is low profile in comparison to [19].…”

“…9 for comparison and they matches well each other only with a small change due to the reasons stated above. A comparison of the proposed design and its performance with some previous designs [18], [19] is presented in Tab. 4.…”

A bioinspired hybrid optimization algorithm for designing broadband frequency selective surfaces

“…This behavior depends on the geometry of the elements, their size, and spacing, used material in its manufacture, and its thickness . Lately, different methods of analysis and design were used to improve the FSS properties, in search of lower cost, better performance, and appropriate dimensions . Figure shows the investigated geometry of the FSS with integrated ring and dipole patch elements.…”