A novel space cloth using resistor grid network for radar absorbers in stealth applications

Sudhendra, Chandrika; Mahule, Vibhor; Pillai, Acr; Mohanty, Atanu K.

doi:10.1109/iccsp.2011.5739405

Cited by 10 publications

(6 citation statements)

References 2 publications

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“…The sheet resistivity values available from Ohrnega are limited to 25, 50, 100, and 250 Q/square; consequently, discrete etched resistors were used to achieve effective sheet resistances with 100 Q/square resistive material, since values ranging continuously from 100-1000 Q/square were needed (e.g. 377, 600, and 950 Q/square) [82]. This design approach is illustrated in Figure 14.…”

Section: Purpose -Model Validationmentioning

confidence: 99%

Radar-cross-section reduction of wind turbines. part 1.

Brock¹,

Loui²,

McDonald³

et al. 2012

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In recent years, increasing deployment of large wind-turbine farms has become an issue of growing concern for the radar community. The large radar cross section (RCS) presented by wind turbines interferes with radar operation, and the Doppler shift caused by blade rotation causes problems identifying and tracking moving targets. Each new wind-turbine farm installation must be carefully evaluated for potential disruption of radar operation for air defense, air traffic control, weather sensing, and other applications. Several approaches currently exist to minimize conflict between wind-turbine farms and radar installations, including procedural adjustroents, radar upgrades, and proper choice of low-impact wind-farm sites, but each has problems with limited effectiveness or prohibitive cost. An alternative approach, heretofore not techoically feasible, is to reduce the RCS of wind turbines to the extent that they can be installed near existing radar installations. This report summarizes efforts to reduce wind-turbine RCS, with a particular emphasis on the blades. The report begins with a survey of the wind-turbine RCS-reduction literature to establish a baseline for comparison. The following topics are then addressed: electromagnetic model development and validation, novel material development, integration into wind-turbine fabrication processes, integrated-absorber design, and wind-turbine RCS modeling. Related topics of interest, including alternative mitigation techoiques (procedural, at-the-radar, etc.), an introduction to RCS and electromagnetic scattering, and RCS-reduction modeling techniques, can be found in a previous report.

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Section: Purpose -Model Validationmentioning

confidence: 99%

Radar-cross-section reduction of wind turbines. part 1.

Brock¹,

Loui²,

McDonald³

et al. 2012

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“…Landy proposed a perfect metamaterial absorber composed of a periodic array of structural cells [1]. Metamaterial absorbers have attracted wide attention, and have been widely used in electromagnetics imaging [2][3][4][5], polarizers [6,7], stealth [8][9][10], and radio frequency [11][12][13]. With the increase in * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

An ionic liquid-based ultra-broadband absorber with temperature stability, polarization insensitivity, and wide incident angle

zhang¹,

Yang²,

Zhang³

et al. 2023

J. Phys. D: Appl. Phys.

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In this paper, an ultra-broadband absorber based on ionic liquids is proposed. It is an absorber that is a fully enclosed resin container, and the resin is filled with an ionic liquids([EMIM][N(CN)2]) with a circular cross-section. The simulation results show that the single-ring absorber can achieve more than 90% absorption in the microwave range of 12.25-50GHz, and the relative bandwidth reaches 121.29%. Based on the theories of equivalent medium and impedance matching, the mechanism of broadband absorption was explored by analyzing the electromagnetic field distribution and power loss density of the absorber. In addition, the absorber exhibits good thermal stability in the range of 20-100 °C, and has the characteristics of polarization insensitivity and wide incident angle. The proposed metamaterial absorber can be fabricated at a low cost, is environment friendly, and may find potential applications in the fields of electromagnetic energy harvesting and stealth technology.

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“…Our interest in including these networks lies in their homogeneous topology, which can serve as a reference for comparing the effects of the studied properties (distance and degree). We only investigate finite D -dimensional lattice-based networks, which can be constructed [ 34 ] and used in stealth [ 35 ], sensors in robotics [ 36 ] or for energy dissipation in road or railroad vehicles [ 37 , 38 ], for instance. We also aim at studying how the dimensionality can increase the robustness of such networks which can, in turn, help in increasing circuit boards reliability.…”

Section: Introductionmentioning

confidence: 99%

Transport collapse in dynamically evolving networks

Berthelot

Tupikina

Kang³

et al. 2023

J. R. Soc. Interface.

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Transport in complex networks can describe a variety of natural and human-engineered processes including biological, societal and technological ones. However, how the properties of the source and drain nodes can affect transport subject to random failures, attacks or maintenance optimization in the network remain unknown. In this article, the effects of both the distance between the source and drain nodes and the degree of the source node on the time of transport collapse are studied in scale-free and lattice-based transport networks. These effects are numerically evaluated for two strategies, which employ either transport-based or random link removal. Scale-free networks with small distances are found to result in larger times of collapse. In lattice-based networks, both the dimension and boundary conditions are shown to have a major effect on the time of collapse. We also show that adding a direct link between the source and the drain increases the robustness of scale-free networks when subject to random link removals. Interestingly, the distribution of the times of collapse is then similar to the one of lattice-based networks.

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A novel space cloth using resistor grid network for radar absorbers in stealth applications

Cited by 10 publications

References 2 publications

Radar-cross-section reduction of wind turbines. part 1.

Radar-cross-section reduction of wind turbines. part 1.

An ionic liquid-based ultra-broadband absorber with temperature stability, polarization insensitivity, and wide incident angle

Transport collapse in dynamically evolving networks

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