Optimisation of a pyramidal geometric transition radar absorbing material loaded with a resistive frequency selective surface

2009 ◽  
Vol 3 (6) ◽  
pp. 596
Author(s):  
K.L. Ford ◽  
D.G. Holtby ◽  
B. Chambers
Keyword(s):  
Frequency Selective Surface ◽  
Radar Absorbing Material ◽  
Geometric Transition ◽  
Absorbing Material ◽  
Frequency Selective

Optimize the Dielectric Slab of the Tunable Active Frequency Selective Surface Absorbing Material

2012 ◽  
Vol 534 ◽  
pp. 209-214 ◽  
Author(s):  
Qian Chen ◽  
Jian Jun Jiang ◽  
Xin Xin Xu ◽  
Biao Sun ◽  
Li Zhang ◽  
...  
Keyword(s):  
Frequency Selective Surface ◽  
Dielectric Slab ◽  
Optimum Thickness ◽  
Absorption Properties ◽  
Absorbing Material ◽  
New Type ◽  
Frequency Selective ◽  
Experimental Equation ◽  
Tunable Absorption ◽  
Selection Of

Active frequency selective surface (AFSS) absorber loaded with PIN diodes is a new type of structural absorber with tunable absorption properties. This absorber is similar to a sandwich, the surface is an AFSS, the middle is a dielectric slab, and the bottom is a metallic ground. In order to design and fabricate a thin and good performance absorber, the selection of dielectric slab is very important. In this paper, we detailed investigated the effects of the dielectric slab parameters (permittivity and thickness) to the absorption properties by experiments, and an experimental equation was proposed to provide a better description about their relationship. The measured results indicated there was an optimum thickness for the dielectric slab to produce the broadest bandwidth. The experimental equation was useful to optimize the design of the absorber.

scholarly journals Design of An Ultra-Thin and Broadband Absorption Materials For Middle-Temperature Applications

2021 ◽  
Author(s):  
Yanmin Jia ◽  
Zhaoning Yang ◽  
Lu Gao ◽  
Wei Ren ◽  
Ruiduan Zhang ◽  
...  
Keyword(s):  
Reflection Loss ◽  
Frequency Selective Surface ◽  
Complex Permeability ◽  
Frequency Range ◽  
Broadband Absorption ◽  
Radar Absorbing Material ◽  
Temperature Environment ◽  
Absorbing Material ◽  
Relationship Of ◽  
The Relationship

Abstract A radar absorbing material (RAM) is designed based on the magnetic ceramic and frequency selective surface (FSS). The phase composition and micromorphology were characterized, respectively. The complex permittivity and complex permeability of magnetic ceramic were tested and studied from 25 ℃ to 500 ℃ temperature. Based on the experimental and simulation results, the changes of reflection loss along with the structure parameters of RAM are analyzed at 500 ℃. The relationship of reflection loss varies with temperature are studied. The analytical results show that the absorption property of the RAM increases with the increase of temperature. An optimal absorption of RAM is obtained at 500℃. When the thickness of RAM is 1.5 mm, the reflection loss lower than -10 dB can be obtained in the frequency range from 8.2 ~ 16 GHz. More than 90% microwave energy can be consumed in the RAM which may be applied in the high temperature environment.

Design and Preparation of Light-Weight Radar Absorbing Material Based on Resistive Frequency Selective Surfaces

2011 ◽  
Vol 335-336 ◽  
pp. 976-980 ◽  
Author(s):  
Liang Kui Sun ◽  
Hai Feng Cheng ◽  
Yong Jiang Zhou ◽  
Wang Jun
Keyword(s):  
Dielectric Substrate ◽  
Experimental Result ◽  
Frequency Selective Surfaces ◽  
Light Weight ◽  
Rigid Polyurethane Foam ◽  
Design And Optimization ◽  
Radar Absorbing Material ◽  
Absorbing Material ◽  
Equivalent Circuit Method ◽  
Frequency Selective

Light-weight radar absorbing material (RAM) based on resistive frequency selective surfaces (FSS) was designed and prepared. The principle of the resonances of the RAM was analyzed by calculating the impedance of the FSS and the grounded substrate according to the equivalent circuit method, and the results show that a wideband absorbing structure can be gained by producing two adjacent resonances. After design and optimization by Genetic Algorithm (GA), the RAM with absorbing bandwidth of 7.5~18GHz below -10dB was obtained, whose thickness is only 3mm. The designed RAM was gained by preparing resistive patches on the grounded dielectric substrate of rigid polyurethane foam using screen painting technology. The density of the absorber is only 0.2g/cm3, the reflectivity was measured and it shows that the experimental result is consistent with the design one.

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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