Study of Current Density and Angular Stability in Frequency Selective Surfaces for Indoor Communications

2021 ◽  
Author(s):  
Jose Filipe de Lima ◽  
Humberto Dionisio de Andrade ◽  
Glauco Fontgalland ◽  
Antonio Sergio Bezerra Sombra ◽  
Karoline Rodrigues Lima ◽  
...  
Keyword(s):  
Current Density ◽  
Angular Stability ◽  
Frequency Selective Surfaces ◽  
Indoor Communications ◽  
Frequency Selective

Room shielding with frequency-selective surfaces for electromagnetic health application

2016 ◽  
Vol 9 (2) ◽  
pp. 291-298 ◽  
Author(s):  
Soheil Hashemi ◽  
Ali Abdolali
Keyword(s):  
Frequency Band ◽  
Specific Absorption Rate ◽  
Equivalent Circuit Model ◽  
Frequency Selective Surfaces ◽  
Concrete Walls ◽  
X Band ◽  
Indoor Communications ◽  
Cubic Structure ◽  
Frequency Selective ◽  
Health Application

Use of frequency-selective surfaces (FSSs) is proposed to shield rooms against electromagnetic fields in order to achieve secure indoor communications and reduce human exposure to external fields. The secure room is designed using two-layer FSSs with an FR4 substrate to cover 10–12 GHz frequency band. Different elements in each layer and shift in the position of elements are the reasons for more than 3 GHz bandwidths in X band. The performance of the structure is also stable versus the misaligned position of layers. An equivalent circuit model is proposed for the structure and results show −20 dB isolation between inside and outside of the room in the desired frequency band. Bio tissue is located inside the cubic structure with FSS walls and the results of the specific absorption rate are demonstrated and compared in two rooms with FSS cover on concrete walls and a room with concrete walls. The 17 × 17 cm2two-layer FSS is fabricated for the measurement and the results are presented. The designed FSS can be used in the construction of wave-isolated room for any application.

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

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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