Scattering parameters of a frequency selective surface between anisotropic dielectric layers for incident co-polarized plane waves

2002 ◽  
Author(s):  
A.L.P.S. Campos ◽  
A.G. d'Assuncao
Keyword(s):  
Plane Waves ◽  
Frequency Selective Surface ◽  
Scattering Parameters ◽  
Anisotropic Dielectric ◽  
Dielectric Layers ◽  
Frequency Selective

Obtaining Directly Quasi-Square Open Ring FSS Constitutive Effective Parameters by Using Coupled WCIP - Retrieval Method

2019 ◽  
Vol 397 ◽  
pp. 187-199
Author(s):  
Saida Mellal ◽  
Toufik Ziar ◽  
Hichem Farh ◽  
Khalid Hati ◽  
Badreddine Zemmal ◽  
...  
Keyword(s):  
Frequency Selective Surface ◽  
Electric Permittivity ◽  
Scattering Parameters ◽  
Effective Parameters ◽  
Retrieval Method ◽  
Matlab Program ◽  
Open Ring ◽  
Analytical Formulas ◽  
Frequency Selective ◽  
Constitutive Parameters

We propose here a method witch analyze the behavior of Quasi-square open ring frequency selective surface (FSS) by using an approach based on the wave iterative concept procedure method (WCIP) coupled to Retrieval from Scattering Parameters method . The scattering parameters calculated by WCIP for a Quasi-square open ring FSS are used, in analytical formulas, to calculate directly observable effective constitutive parameters (relative electric permittivity εreff , magnetic permeability μreff and refractive index n ) of a frequency selective surface. Results of effective constitutive parameters for a Quasi-square open ring FSS structure are presented by Simulation using MATLAB program codes translating the implementation of the proposed approach.

Design of a hybrid A-sandwich radome using a strongly coupled frequency selective surface element

2020 ◽  
Vol 12 (8) ◽  
pp. 738-748 ◽  
Author(s):  
Krushna Kanth Varikuntla ◽  
Raghavan Singaravelu
Keyword(s):  
Transmission Loss ◽  
Incidence Angle ◽  
Core Layer ◽  
Middle Layer ◽  
Frequency Selective Surface ◽  
Surface Element ◽  
Dielectric Parameters ◽  
Strongly Coupled ◽  
Dielectric Layers ◽  
Frequency Selective

AbstractThe airborne radomes have to cater superior electromagnetic (EM) performance with bandpass characteristics of stealth application. In this regard, a hybrid A-sandwich radome is proposed in this paper. The proposed radome consists of a novel strongly coupled frequency selective surface (FSS) core sandwiched between two dielectric layers (acts as skin) to form an A-sandwich structure. The dielectric layers are cascaded in such a way that the middle layer has less dielectric parameters than the skin dielectric. The core layer comprises a modified FSS array using strongly coupled FSS layers through a series of metallic vias. This strongly-coupled FSS element will have the advantage of eliminating inter-element interference and improves the EM performance characteristics of the structure. The structure exhibits very good band-pass characteristics (>90%) at a normal impinging angle with sharp roll-off characteristics. To show the efficacy of the proposed structure, the transmission loss has been compared with that of conventional A-sandwich radomes at 0°, 50° incidence angle for both TE and TM polarization. Conformal analysis of the unit cell has been carried out, and sector-wise thickness optimization was performed to analyze the structure for the conformal shaped radome application. Finally, a physical prototype has been fabricated and measured its scattering parameters, radiation characteristics in a fully shielded anechoic chamber. The results are encouraging and prove its suitability for radome application.

scholarly journals A Tri-band Second-order Frequency Selective Surface Designing and Analysis

2021 ◽  
Vol 275 ◽  
pp. 03084
Author(s):  
Gao Shan ◽  
ChunYan Gao ◽  
HongBin Pu ◽  
ChunLan Chen
Keyword(s):  
Frequency Selective Surface ◽  
Second Order ◽  
Dual Band ◽  
Microwave Filter ◽  
Band Frequency ◽  
Dielectric Layers ◽  
Band Pass ◽  
Frequency Selective ◽  
Band Separation ◽  
Excellent Stability

In this paper, inspired from the technique of patch–aperture–patch, a novel tri-band frequency selective surface with second-order band-pass response in each operation band is presented. The design is implemented by cascading a two-dimensional periodic array of three square loops and an array of wire grids. The proposed structure composed of three metal and two dielectric layers acts as a spatial dual band microwave filter with large band separation. The predicted FSS has the merits of broadband response, excellent stability for different incident angles, and sharp roll-off at X-, Ku- and K-band, respectively. The simulation and measurement are carried out and discussed. The measured results agree well with the simulated ones.

Characterization of frequency-selective surface spatial filters in a rectangular waveguide

2012 ◽  
Vol 4 (1) ◽  
pp. 59-69 ◽  
Author(s):  
Fabien Debarros ◽  
Pierre Lemaître-Auger ◽  
Alysson Vasconcelos Gomes de Menezes ◽  
Romain Siragusa ◽  
Tan-Phu Vuong ◽  
...  
Keyword(s):  
Rectangular Waveguide ◽  
Assessment Tool ◽  
Low Cost ◽  
Plane Waves ◽  
Single Mode ◽  
Frequency Selective Surface ◽  
Spatial Filters ◽  
Full Wave ◽  
Frequency Selective ◽  
Axes Of Symmetry

The possibility to characterize infinite and periodic frequency-selective surfaces (FSS) filters that have two orthogonal axes of symmetry inside a waveguide is reported. Thus, preliminary measurements can rapidly be obtained at low cost with few elementary cells instead of using a large FSS panel in free space. This is possible because of the equivalence that exists between the electromagnetic fields of two symmetric and oblique plane waves incident on and reflected from an infinite periodic surface and the incident/reflected fields that exist inside a single-mode rectangular waveguide containing a finite number of elementary cells. Comparisons of the measurements with some full-wave simulations for FSS belonging to the first three groups as they were defined by Munk confirm the good agreement between them. This is an interesting and simple assessment tool concerning the fabrication quality of FSS. The extension of this technique to non-symmetric FSS patterns is also discussed and supported by experimental and simulation results. The limitations of the technique are finally discussed.

Dual-Band Band-Pass Frequency Selective Surface Based on the Matryoshka Geometry with Angular Stability and Polarization Independence

2020 ◽  
Author(s):  
Alfredo Gomes Neto ◽  
Jefferson Costa e Silva ◽  
Alexandre Jean Rene Serres ◽  
Marina de Oliveira Alencar ◽  
Ianes Barbosa Grecia Coutinho ◽  
...  
Keyword(s):  
Frequency Selective Surface ◽  
Angular Stability ◽  
Dual Band ◽  
Band Pass ◽  
Frequency Selective
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