Electromagnetic shielding by thin periodic structures and the Faraday cage effect

Delourme, Bérangère; Hewett, David P.

doi:10.5802/crmath.59

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…Remark A.1.For the sake of conciseness, the proof of the existence and uniqueness of Q − and Q + is not written here (e.g. [8]). It is based on the application of the Lax–Milgram lemma together with a Hardy equality [19, lemma 2.5.7].…”

Section: Figure 16mentioning

confidence: 99%

“…Indeed, for thick wires with ( e / h ) = O (1), the coupling cannot be captured by the limit problem; at zero order, the array is crudely replaced by a Dirichlet wall. (In [8], this is used to discriminate between different geometries of arrays producing an efficient shielding.) The coupling is captured at the first order.…”

Section: Introductionmentioning

confidence: 99%

“…governed by the Helmholtz equation [5][6][7], and to the electromagnetic case, i.e. governed by Maxwell's equations [8]. The aim is to evaluate the effectiveness of the shielding when waves propagate outside a cage made of a periodic arrangement of wires; in two dimensions, the distance between the wires is h and their typical extent is e. The low-frequency regime is considered, i.e.…”

Section: Introductionmentioning

confidence: 99%

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A stable, unified model for resonant Faraday cages

et al. 2021

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We study some effective transmission conditions able to reproduce the effect of a periodic array of Dirichlet wires on wave propagation, in particular when the array delimits an acoustic Faraday cage able to resonate. In the study of Hewett & Hewitt (2016 Proc. R. Soc. A 472 , 20160062 ( doi:10.1098/rspa.2016.0062 )) different transmission conditions emerge from the asymptotic analysis whose validity depends on the frequency, specifically the distance to a resonance frequency of the cage. In practice, dealing with such conditions is difficult, especially if the problem is set in the time domain. In the present study, we demonstrate the validity of a simpler unified model derived in Marigo & Maurel (2016 Proc. R. Soc. A 472 , 20160068 ( doi:10.1098/rspa.2016.0068 )), where unified means valid whatever the distance to the resonance frequencies. The effectiveness of the model is discussed in the harmonic regime owing to explicit solutions. It is also exemplified in the time domain, where a formulation guaranteeing the stability of the numerical scheme has been implemented.

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Section: Figure 16mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A stable, unified model for resonant Faraday cages

et al. 2021

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“…If the whole machine debugging and performance appraisal of the radar adopts field test, real targets (such as rockets and satellites) are used to provide test signals to the radar, financial, and material resources and increase the development cost. When the energy of the incident ray photon exceeds 1.02 MeV (equivalent to 2 times the rest mass of the electron), there will be a positive-negative electron pair effect, that is, the incident high-energy photon forms a positive-negative electron pair in the Coulomb field of the material nucleus with the energy equal to the incident photon energy [15,16].…”

Section: Electromagnetic Occlusion Algorithmmentioning

confidence: 99%

Electromagnetic Occlusion Algorithm Based on FPGA and Panel Grouping and Its Optimization

Cao

2021

Wireless Communications and Mobile Computing

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With the development of digital signal processing and advanced algorithms, real-time signal processing based on FPGA and DSP is suitable for high-speed radar signal processing. With the rapid development of science and technology, war has entered the information age guided by high technology, and advanced science and technology has played a vital role in the trend of war. In recent years in the modern war, many countries invest a lot of research effort on the stealth technology, and advanced stealth technology can use a variety of technical means to alter or weaken the feature information of the target, confuse the enemy radar detection system effectively, reduce the chance of being detected to the largest extent, and prolong the lifecycle of aircraft and weapons. This research mainly discusses the electromagnetic occlusion algorithm and its optimization based on FPGA and panel grouping. The FPGA model selected for this study is XC6VLX240T-1FF1156I. Because the amount of data processed here is not very large, the cache part directly uses the on-chip storage resources of the FPGA, and the AD device is used to perform analog-to-digital/digital-to-analog conversion on the signal and perform digital up-down conversion. For a facet, it is necessary to first verify whether it is a bright facet and set the flag to mark it, then the facet needs to be occluded with the triangular facet marked as a bright facet, and all bright facets that have been marked need to be traversed. Open MP parallelization of the occlusion algorithm is as follows: The physical optics method is used to calculate the target RCS, and the focus of parallelism is placed on the part with a large amount of calculation. When using Open MP to design a program on a multicore computer, each group is assigned a thread to give full play to the core computing power. The total field is scattered and superimposed by each surface element. This part uses the parallel processing mode of Open MP, which allows the panel judgment in the group to be carried out at the same time. This part requires schedule to allocate resources and use different parallel mechanisms for different calculations to optimize debugging. In the angular range where there is multiple scattering at 0 ° ≤ φ ≤ 90 ° , the calculation results and the measurement results are in good agreement, and when the two planes are simulated with 1820 triangular faces, the fast multiple scattering in this paper only needs 4 minutes. This research has realized the general radar signal processing method based on FPGA structure, and the design has important engineering realization significance.

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A study on EMI shielding in aircraft: introduction, methods and significance of using electrospun nanocomposites

DJ,

Wessley

2024

Journal of Space Safety Engineering

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Electromagnetic shielding by thin periodic structures and the Faraday cage effect

Cited by 4 publications

References 11 publications

A stable, unified model for resonant Faraday cages

A stable, unified model for resonant Faraday cages

Electromagnetic Occlusion Algorithm Based on FPGA and Panel Grouping and Its Optimization

A study on EMI shielding in aircraft: introduction, methods and significance of using electrospun nanocomposites

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