Radar Absorbing Structures Using Frequency Selective Surfaces: Trends and Perspectives

Narayan, Shiv; Sreeja, J.; Surya, V. V.; Sangeetha, B.; Nair, Raveendranath U.

doi:10.1007/s11664-019-07911-2

Cited by 12 publications

(5 citation statements)

References 25 publications

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“…RADAR [30]: The detection of human activity can be performed using RADAR-based monitoring that has a significantly larger bandwidth [31]. RADAR utilises a bandwidth of up to 1.79 GHz, while WiFi technology only uses up to 20 MHz [32]. The micro-Doppler information extraction methods based on RADAR provide a higher spatial resolution of around 20 cm [33].…”

Section: Literature Reviewmentioning

confidence: 99%

Software-Defined Radio-Based Contactless Localization for Diverse Human Activity Recognition

et al. 2023

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This paper presents a study on contactless localization for activity recognition based on radio-frequency sensing. The focus of this study is on the quantitative analysis of the collected data, which is in the form of channel state information (CSI). The proposed method utilizes a software-defined radio (SDR) system in combination with an ensemble learning technique to localize and identify daily living activities such as leaning, sitting, standing and walking. Specifically, SDR device, Universal Software Radio Peripheral (USRP) models X300/X310 are utilized to collect data on the aforementioned activities. The data is collected from an empty space and a participant performing daily living activities in different territories. The acquired data is labelled based on the region, zone and performed activity. The CSI data is subsequently preprocessed and fed into an ensemble-based machine learning algorithm for classification. Furthermore, the stability analysis of the proposed method is performed to evaluate its reliability and robustness. The performance of the algorithm is evaluated using various metrics, including a confusion matrix, accuracy, cross-validation score and training time [1], [2]. The results demonstrate that the proposed ensemblebased approach achieves a high accuracy of up to 90% in activity recognition, highlighting the effectiveness of the proposed method in contactless localization for activity recognition.

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Section: Literature Reviewmentioning

confidence: 99%

Software-Defined Radio-Based Contactless Localization for Diverse Human Activity Recognition

et al. 2023

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“…12,21 However, the former can only be achieved in a limited angular region and remains effective only at higher frequencies, 20 and experts believe that the latter is the most effective way of manufacturing these types of structures as it offers the possibility of introducing frequency-selective features in the design during the manufacturing process. [22][23][24] The implementation of this type of technology using highperformance GFRP composites is currently being considered by numerous researchers and engineers worldwide not only because of their outstanding mechanical properties but also because of the flexibility of tailoring their electromagnetic properties effectively by controlling their manufacturing parameters. 11,25 Although radar-absorbing structures can be designed in different shapes and configurations, GFRP-based multilayered wideband absorbers with broadband characteristics are among the commonly used types of radarabsorbing structures.…”

Section: Introductionmentioning

confidence: 99%

“…Interestingly, the aforementioned radar cross‐section areas can be reduced by properly shaping the target, or developing the radar‐absorbing material/structures 12,21 . However, the former can only be achieved in a limited angular region and remains effective only at higher frequencies, 20 and experts believe that the latter is the most effective way of manufacturing these types of structures as it offers the possibility of introducing frequency‐selective features in the design during the manufacturing process 22–24 . The implementation of this type of technology using high‐performance GFRP composites is currently being considered by numerous researchers and engineers worldwide not only because of their outstanding mechanical properties but also because of the flexibility of tailoring their electromagnetic properties effectively by controlling their manufacturing parameters 11,25 …”

Section: Introductionmentioning

confidence: 99%

Toward tailoring the mechanical and dielectric properties of short glass fiber‐reinforced epoxy composites

Nsengiyumva,

Zhong,

Chen

et al. 2023

Polymer Composites

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Glass fiber‐reinforced polymer‐matrix (GFRP) composites are used to manufacture devices such as radomes, electrical insulators, and radar‐absorbing structures, many of which are used in applications with strict mechanical and dielectric property requirements. As such, designs and properties of GFRP composite materials should be regularly improved to guarantee their safe operation and meet their constantly evolving application requirements. In this study, glass fiber (GF) particles and epoxy resin 128 (EP‐128) were used to manufacture high‐performance EP/GF‐X composites with GF particle contents ranging from 5% to 40%. An investigation into their mechanical and dielectric properties revealed that EP/GF‐20 composite specimens presented the best mechanical performance with their bending strength and modulus reaching 159.68 MPa and 6521.92 MPa, respectively, and an average dielectric constant of 4.862 within the 10–105 Hz frequency range. A theoretical analysis of the EP/GF‐X composite specimens' dielectric constants using classic dielectric models based on the Lichtenecker, Bruggeman, Jaysundere‐Smith, and Maxwell‐Garnett rule‐of‐mixture equations indicated that the dielectric model based on the Bruggeman rule‐of‐mixture equation provided the dielectric constants closest to the measured values with a maximum deviation of less than −0.321% for EP/GF‐40 composites. This study provides a feasible strategy to control the mechanical and dielectric properties of GFRP composites.Highlights Glass fiber (GF) particles and epoxy 128 (EP‐128) resin were used to manufacture high‐performance glass fiber‐reinforced epoxy (EP/GF‐X) composites. The composite manufacturing process was carefully controlled to ensure uniform distribution and orientation of GF particles in the EP‐128 resin. The mechanical and dielectric properties of the manufactured EP/GF‐X composites were effectively tailored by controlling the content and distribution of GF particles in the EP‐128 resin matrix. The dielectric constants of the EP/GF‐X composites were measured experimentally and predicted using various theoretical dielectric models. The Bruggeman model provided the dielectric constants of the EP/GF‐X composites closest to the measured values.

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“…The initial approach to RCS reduction involves the utilization of radar-absorbing materials (RAMs) or radar-absorbing structures (RASs), which absorb incoming radar signals and effectively decrease them [ 9 , 10 , 11 , 12 , 13 ]. However, these methods can be costly, not only in terms of manufacturing but also for maintenance purposes.…”

Section: Introductionmentioning

confidence: 99%

Compensation of Heat Effect in Dielectric Barrier Discharge (DBD) Plasma System for Radar Cross-Section (RCS) Reduction

Jung

Cho

Choi

et al. 2023

Sensors

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In this study, the problems encountered in radar cross-section (RCS) measurement experiments utilizing a dielectric barrier discharge (DBD) plasma system are examined and an effective solution is proposed. A DBD plasma system generates heat due to the high bias voltage required for plasma generation. The thermal-induced structural deformation of the DBD structure caused by this high voltage and its impact on RCS measurements are analyzed. In addition, techniques for minimizing the thermal-induced deformation and compensation methods for addressing the minimized deformation are proposed. Furthermore, RCS measurements are conducted on two kinds of DBD structures using the proposed method to experimentally demonstrate the improved agreement between the simulation and measurement results. For both structures, the RCS experimental results are in very good agreement with the simulation results, which enables accurate plasma characterization. In conclusion, it can be expected that the proposed method can be used to provide more accurate RCS measurements on various DBD structures that generate high heat.

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Radar Absorbing Structures Using Frequency Selective Surfaces: Trends and Perspectives

Cited by 12 publications

References 25 publications

Software-Defined Radio-Based Contactless Localization for Diverse Human Activity Recognition

Software-Defined Radio-Based Contactless Localization for Diverse Human Activity Recognition

Toward tailoring the mechanical and dielectric properties of short glass fiber‐reinforced epoxy composites

Compensation of Heat Effect in Dielectric Barrier Discharge (DBD) Plasma System for Radar Cross-Section (RCS) Reduction

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