A comparison between two hybrid techniques for the scattering from finite frequency-selective surfaces

2001 ◽  
Vol 31 (4) ◽  
pp. 248-252 ◽  
Author(s):  
C. Pochini ◽  
G. Toso ◽  
G. Pelosi ◽  
A. Roederer
Keyword(s):  
Frequency Selective Surfaces ◽  
Finite Frequency ◽  
Hybrid Techniques ◽  
Frequency Selective ◽  
Two Hybrid

scholarly journals Optimization and synthesis of multilayer frequency selective surfaces via bioinspired hybrid techniques

2020 ◽  
Vol 8 (5) ◽  
pp. 542-561
Author(s):  
Wirlan Gomes Lima ◽  
Jasmine Priscyla Leite Leite de Araújo ◽  
Fabrício José Brito Barros ◽  
Gervásio Protásio Dos Santos Cavalcante ◽  
Cássio da Cruz Nogueira ◽  
...  
Keyword(s):  
Search Algorithm ◽  
Cuckoo Search ◽  
Cuckoo Search Algorithm ◽  
General Regression Neural Network ◽  
Electromagnetic Properties ◽  
Frequency Selective Surfaces ◽  
Hybrid Techniques ◽  
Operating Frequency Range ◽  
Frequency Selective ◽  
General Regression

In this study, two bioinspired computation (BIC) techniques are discussed and applied to the project and synthesis of multilayer frequency selective surfaces (FSS) within the microwave band, specifically for C, X and Ku bands. The proposed BIC techniques consist of combining an artificial, general regression neural network to a genetic algorithm (GA) and a cuckoo search algorithm, respectively. The objective is to find the optimal values of separation between the investigated FSS. Numerical analysis of the electromagnetic properties of the device is made possible with the finite integration method (FIT) and validated through the finite element method (FEM), utilizing both softwares CST Microwave Studio and Ansys HFSS respectively. Thus, the BIC-optimized devices present good phase / angular stability for angles 10°, 20°, 30° and 40°, as well as being polarization independent. The cutoff frequencies to control the operating frequency range of the FSS, referring to transmission coefficient in decibels (dB), were obtained at a threshold of –10dB. Numerical results denote good accordance with measured data.

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