Radar Absorbers Based on Frequency Selective Surfaces on Perforated Substrates

Fallahi, Arya; Mishrikey, Matthew; Hafner, Christian; Vahldieck, R.

doi:10.1166/jctn.2008.041

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…Electromagnetic fields within a periodic medium can be formulated by the multiconductor transmission line model which leads to a set of telegraph equations [26], [27] (19) and…”

Section: Green's Function Matrixmentioning

confidence: 99%

“…The solution of the coupled differential (19) can be written as (21) where is a matrix whose columns are eigenvectors of . The diagonal matrix consists of as its diagonal elements where is an eigenvalue of .…”

Section: Green's Function Matrixmentioning

confidence: 99%

“…However, these substrates are rarely used because of manufacturing difficulties. Recently another idea for engineering substrates based on introducing periodic inhomogeneity was proposed [18], [19] which is easily manufacturable. For example, drilling holes in the substrate and/or filling them with other materials changes the effective permittivity or permeability of the substrate.…”

Section: Introductionmentioning

confidence: 99%

“…For example, drilling holes in the substrate and/or filling them with other materials changes the effective permittivity or permeability of the substrate. Furthermore a periodic substrate itself is a resonating structure, therefore this kind of substrates could be used in applications, which are based on resonance effects [19].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Analysis of Frequency Selective Surfaces on Periodic Substrates Using Entire Domain Basis Functions

Yahaghi

Fallahi

Abiri

et al. 2010

IEEE Trans. Antennas Propagat.

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The paper presents an efficient procedure to utilize the existing method of moments/boundary integral-resonant mode expansion approach for the analysis of frequency selective surfaces printed on periodic and inhomogeneous substrates. The Green's function matrix of the structure is obtained using a multiconductor transmission line model. The resulting series equations are solved by using the periodic method of moments with entire domain functions as both basis and test functions. The required entire domain functions are extracted using boundary integral-resonant mode expansion. The Fourier coefficients of the basis functions are evaluated from the coupling integrals by applying a coordinate transformation. Some examples are analyzed and compared to measurement data. To illustrate the excellent convergence of the method, a comparison between using entire domain and sub-domain functions is made. It is shown that by using the proposed approach not only the number of required basis functions reduces but also lower truncation orders in the Fourier expansions need to be considered. This leads to a drastic reduction of the computation time.Index Terms-Boundary integral resonant mode expansion, entire domain basis functions, frequency selective surfaces, method of moments, multiconductor transmission lines method, periodic structures, spectral domain analysis.

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“…Electromagnetic fields within a periodic medium can be formulated by the multiconductor transmission line model which leads to a set of telegraph equations [26], [27] (19) and…”

Section: Green's Function Matrixmentioning

confidence: 99%

Section: Green's Function Matrixmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of Frequency Selective Surfaces on Periodic Substrates Using Entire Domain Basis Functions

Yahaghi

Fallahi

Abiri

et al. 2010

IEEE Trans. Antennas Propagat.

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“…Several approaches are developed to realize the resonance in the lossy material, each of which leads to a particular absorber type. Some typical approaches are placing a resistive sheet in the distance of 0 /4 from a ground plane as in Salisbury screens [2,3], using the Fabry-Perot resonances of a thin lossy layer [4] as well as multi-layers absorbing materials [5], the resonance frequencies of a periodic metallic array printed on a lossy material as in the metamaterial absorbers [6][7][8][9][10][11][12], and the resonance frequencies of periodically textured lossy material [13,14]. This absorber type offers a unique opportunity to fabricate flat configurations with portable geometries and low susceptibility to damage.…”

Section: Introductionmentioning

confidence: 99%

Modeling Pyramidal Absorbers Using the Fourier Modal Method and the Mode Matching Technique

Fallahi

Enayati²

2016

IEEE Trans. Electromagn. Compat.

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-The problem of plane wave diffraction from the periodic structure of an infinite PEC wall lined with pyramidal absorbers is considered. A hybrid method based on the R-matrix Fourier modal method (RFMM) and the mode matching (MM) of fields is used for the efficient and robust analysis of this class of absorbers. The hybrid method benefits from the discrete spectrum of the periodic structure in transverse directions and consequently avoids spatial discretization along the periodicity axes. This leads to considerable reduction in the number of unknown coefficients. Furthermore, the method is capable of considering dispersive and inhomogeneous materials which are frequently used in the absorber industry. Several examples are outlined, simulated and measured to show the efficiency and accuracy of the method. The versatility and flexibility of the hybrid RFMM-MM technique makes it suitable for the optimal design of pyramidal absorbers to achieve further improvements in their performances.

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