RCS of Large Bent Waveguide Ducts From a Modal Analysis Combined With the Kirchhoff Approximation

Bourlier, Christophe; He, Hongyang; Chauveau, Janic; HÃ©mon, RÃ©gis; Pouliguen, Philippe

doi:10.2528/pier08101708

Cited by 9 publications

(7 citation statements)

References 25 publications

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“…In particular, the formulation of the reconstruction problem as a linear inverse one is achieved by means of the adoption of the Kirchhoff Approximation (see [10,11]). By using a linear formulation, the inverse problem is solved by exploiting the assessed tool of the Singular Value Decomposition [12], which permits to set-up stable inversion schemes and also to investigate their reconstruction performances [12][13][14][15].…”

Section: Introduction and Motivationsmentioning

confidence: 99%

“…S(f ) = −j/(4πωµ 0 ) is a term only-frequency dependent, wherein j is the imaginary unit and ω = 2πf (being f the working frequency); β and µ 0 represent the wavenumber of the investigated medium and the magnetic permeability in free space, respectively. We assume that the objects to be investigated have a planar shape and dimensions comparable with the probing wavelength, and that they are located in a plane at constant depthz; under these assumptions, it is possible to exploit the Kirchhoff Approximation [10,11] and to write the electric density current induced on the target's surface as…”

Section: Problem Formulationmentioning

confidence: 99%

See 1 more Smart Citation

A Simple Processing Approach for Holographic Rascan Data

Soldovieri

Morabito²,

D’Agostino³

et al. 2010

PIER

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Abstract-This paper presents a reconstruction approach which exploits the field detected by a holographic radar in order to localize and geometrically qualify a set of scattering objects. In particular, thanks to the adoption of the Kirchhoff Approximation, the problem is formulated as a linear inverse one wherein the unknown function is the characteristic function accounting for the support (location and geometry) of the target(s). The reconstruction performances of the approach are investigated through an accurate numerical analysis, and an experimental validation is also performed with the aim of testing the effectiveness and the practical relevance of the proposed method.

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Section: Introduction and Motivationsmentioning

confidence: 99%

Section: Problem Formulationmentioning

confidence: 99%

A Simple Processing Approach for Holographic Rascan Data

Soldovieri

Morabito²,

D’Agostino³

et al. 2010

PIER

View full text Add to dashboard Cite

show abstract

“…The first is an exact solution using a mode matching method with a scattering matrix analysis [2][3][4][5][6]. In this method, the jet engine is treated as a complex open-ended waveguide cavity structure.…”

Section: Introductionmentioning

confidence: 99%

“…The first is geometrical modification of the jet engine structure, which backscatters incident radar waves to the opposite direction of the incidence. For reduction of the jet engine RCS, the straight jet engine structure is commonly bent into an S-shape [6,7]. This method is quite effective but the whole structure of the jet engine requires large modification relative to the straight jet engine.…”

Section: Introductionmentioning

confidence: 99%

RCS Reduction of Open-Ended Circular Waveguide Cavity With Corrugations Using Mode Matching and Scattering Matrix Analysis

Kim¹,

Lim²,

Han³

et al. 2014

PIER

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Abstract-A scattered radar signal by a jet engine inlet involves engine information of the target. The jet engine RCS due to the engine inlet is therefore significant in radar target recognition. Accordingly, several accurate analyses of the jet engine RCS have been reported. Reduction of the jet engine RCS is also required for stealth technology. We suggest a new approach for jet engine RCS reduction that involves the insertion of many small corrugations into the jet engine inlet. The proposed jet engine structure is assumed to be a circular waveguide cavity with many corrugations. The structure is analyzed by combining a mode matching technique with a scattering matrix analysis. The proposed closed-form RCS solutions of the corrugated engine structure are validated with a MoM simulation using FEKO. The proposed closed-form solution has numerical efficiency and rapid convergence. Using the characteristics of the solution, we simply apply a genetic algorithm (GA) to optimize the structure of the corrugations in terms of minimizing the RCS.

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“…For many years, Radar Cross Section (RCS) [1][2][3][4][5][6][7][8][9] reduction has been a field of interest for different applications where the goal is the reduction of the scattered electromagnetic field when illuminating the objectof-interest by an incident wave [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Depending on the emitting and receiving device, RCS can be monostatic (the transmitter and the …”

Section: Introductionmentioning

confidence: 99%

On the Influence of Coupling Amc Resonances for RCS Reduction in the SHF Band

Cos¹,

Álvarez-López²,

Las-Heras³

2011

PIER

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Abstract-A novel approach to Radar Cross-Section reduction using a thin Artificial Magnetic Conductor (AMC) structure is presented. The novel AMC structure combines two unit-cell metallization sizes and so it presents two resonant frequencies. RCS reduction is based on destructive interference of two partial reflections. Taking as starting point a previous work showing significant RCS reduction based on the combination of two AMC surfaces with overlapped AMC operation bandwidths (so that they have similar reflection coefficient amplitude) without a 180 • -phaseshift, the key point of this contribution is to analyze the influence of the degree of the aforementioned overlapping on RCS reduction and to show that this achievement is based on coupling phenomena. A comparison of the achieved RCS reduction when combining two AMCs whose AMC operation bandwidth overlaps, two AMCs with non-overlapped AMC operation bandwidths, and PEC-AMC is presented. Prototypes of these three combinations have been manufactured (having them the same size) and their RCS has been measured in an anechoic chamber.

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RCS of Large Bent Waveguide Ducts From a Modal Analysis Combined With the Kirchhoff Approximation

Cited by 9 publications

References 25 publications

A Simple Processing Approach for Holographic Rascan Data

A Simple Processing Approach for Holographic Rascan Data

RCS Reduction of Open-Ended Circular Waveguide Cavity With Corrugations Using Mode Matching and Scattering Matrix Analysis

On the Influence of Coupling Amc Resonances for RCS Reduction in the SHF Band

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