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Teses / dissertações sobre o tema "Radar Absorbing Materials (RAM)"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Sudhendra, Chandrika. "A Novel Chip Resistor Spacecloth For Radar Absorbing Materials." Thesis, Indian Institute of Science, 2006. https://etd.iisc.ac.in/handle/2005/280.

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Spacecloth design and development is vital and crucial in Radar Absorbing Materials (RAM) for achieving Low Observability in an Aircraft or an Unmanned Air Vehicle(UAV). The RAM design translates into the spacecloth design. The spacecloths form the constituent layers in a broadband Jaumann absorber in which case they have to be designed for various values of surface resistivity. The design specifications of spacecloth(s) in RAMS is well understood and documented in literature. But the design of spacecloth hitherto, has been the domain of materials' scientists wherein the specified properties o

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2

Sudhendra, Chandrika. "A Novel Chip Resistor Spacecloth For Radar Absorbing Materials." Thesis, Indian Institute of Science, 2006. http://hdl.handle.net/2005/280.

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Spacecloth design and development is vital and crucial in Radar Absorbing Materials (RAM) for achieving Low Observability in an Aircraft or an Unmanned Air Vehicle(UAV). The RAM design translates into the spacecloth design. The spacecloths form the constituent layers in a broadband Jaumann absorber in which case they have to be designed for various values of surface resistivity. The design specifications of spacecloth(s) in RAMS is well understood and documented in literature. But the design of spacecloth hitherto, has been the domain of materials' scientists wherein the specified properties o

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3

Pessoa, R?gia Chacon. "Estudo das caracter?sticas magn?ticas e absorvedoras das ferritas de nizn, niznmn, mnzn, nimg, nicuzn e nicuznmg obtidas via m?todo do citrato precursor." Universidade Federal do Rio Grande do Norte, 2009. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17716.

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Made available in DSpace on 2014-12-17T15:42:08Z (GMT). No. of bitstreams: 1 RegiaCP_TESE.pdf: 5580865 bytes, checksum: b0d574167afcc48aece0c780848733c2 (MD5) Previous issue date: 2009-12-22<br>Universidade Estadual de Roraima<br>Were synthesized systems Ni0,5Zn0,5Fe2O4, i0,2Zn0,5Mn0,3Fe2O4, Mn0,5Zn0,5Fe2O4, Ni0,5Mg0,5Fe2O4, Ni0,2Cu0,3Zn0,5Fe2O4 and Ni0,2Cu0,3Zn0,5Mg0,08Fe2O4, the precursors citrate method. The decomposition of the precursors was studied by thermogravimetric analysis and spectroscopy in the infrared region, the temperature of 350?C/3h. The evolution of the phases formed aft

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4

Rodrigues, Manuella Karla da Cruz. "Estudo da viabiliza??o do uso da mistura h?brida ferrocarbonila / ferrita de NI0,5Zn0,5Fe2o4 como material absorvedor de radia??o eletromagn?tica." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17652.

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Made available in DSpace on 2014-12-17T15:41:56Z (GMT). No. of bitstreams: 1 ManuellaKCR_DISSERT.pdf: 3952261 bytes, checksum: 56cf586893164ffedc3ec29beb8e775a (MD5) Previous issue date: 2010-08-31<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>Were synthesized ferrites of NiZn on systems Ni0,5Zn0,5Fe2O4, the precursors citrate method. The decomposition of the precursors was studied by thermogravimetric analysis and spectroscopy in the infrared region, the temperature of 350?C/3h. The evolution of the phases formed after calcinations at 350?C/3h, 600, 1000 and 1100?C/2h wa

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5

Ford, Lee. "Adaptive radar signature control with the use of radar absorbing materials." Thesis, University of Sheffield, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398391.

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6

Yildirim, Egemen. "Development Of Multi-layered Circuit Analog Radar Absorbing Structures." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614314/index.pdf.

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A fast and efficient method for the design of multi-layered circuit analog absorbing structures is developed. The method is based on optimization of specular reflection coefficient of a multi-layered absorbing structure comprising of lossy FSS layers by using Genetic Algorithm and circuit equivalent models of FSS layers. With the introduced method, two illustrative absorbing structures are designed with -15 dB reflectivity for normal incidence case in the frequency bands of 10-31 GHz and 5-46 GHz, respectively. To the author&rsquo<br>s knowledge, designed absorbers are superior in terms of fre

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7

Sharma, Reena. "Scattering From Chiral And Chirally Coated Bodies." Thesis, 1996. https://etd.iisc.ac.in/handle/2005/1572.

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8

Sharma, Reena. "Scattering From Chiral And Chirally Coated Bodies." Thesis, 1996. http://etd.iisc.ernet.in/handle/2005/1572.

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9

He, Ying-Hsien, and 何應賢. "The study of Radar absorbing materials." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/64956476451386367298.

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碩士<br>國防大學中正理工學院<br>兵器系統工程研究所<br>94<br>In this study, the electromagnetic wave absorbing (EMA) properties of graphite/epoxy sheets were investigated. The hybrid graphite/epoxy sheets were fabricated with the addition of graphite into epoxy resin. The graphite size, thickness of sheets, and weight amount varied for optimizing absorbing sheets. The corresponding EMAs of graphite sheets were measured by a free space vector network analyzer in the frequency range of 3~18 GHz. The experimental results have demonstrated that the graphite/epoxy sheets effectively absorb the electromagnetic wave, espe

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10

MARRA, FABRIZIO. "Development of Graphene-based Nanocomposites for Radar Absorbing Materials." Doctoral thesis, 2016. http://hdl.handle.net/11573/879804.

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Novel graphene-based nanocomposites, consisting of a polymeric-based system filled with graphene nanoplatelets (GNP) are developed for application as low-cost lightweight electromagnetic shielding materials. A significant challenge in radar absorbing materials (RAM) technology is the development of lightweight absorbing materials with frequency selective properties for EM shielding and EM decoupling among radiating systems and antenna arrays. In fact, frequency selective radar-absorbing materials (FS-RAM) would allow the selective EM shielding of a speciﬁc frequency simultaneously prov

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11

WANG, SHENG-CHIH, and 王聖智. "Preparation and Characterization of High Temperature Radar Wave Absorbing Materials." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/v4r8de.

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碩士<br>國防大學理工學院<br>化學工程碩士班<br>105<br>Eelectromagnetic (EM) wave absorbing materials have been widely used in the commercial and military applications for years. More recently, considerable efforts have been made toward the development of the hybrid composition and structure microwave absorbers to meet the requirements such as strong absorption characteristics and wide absorption frequency, lightweight and anti-oxidation. A flexible composite consisting of up to 50 wt% β-phase silicon carbide powder and silicon resin, added with a little extra amount of multi-walled carbon nanotube (~1 wt%), was

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12

Teng, Chun-chung, and 鄧淳中. "The Study and Application of Nanocarbon Materials in Radar Absorbing Structures." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/59896274283653125270.

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碩士<br>逢甲大學<br>航太與系統工程所<br>98<br>The radar absorbing structures (RAS) are multifunctional composites with dual functions of high strength performance and radar cross section (RCS) reduction. To improve the bandwidth of RCS, a circuit analog RAS is fabricated by replacing the resistive sheet of a Salisbury screen by a frequency selective surface (FSS). This dissertation is aimed to the design, analysis and manufacturing of circuit analog absorbers with broadband, light-weighted and excellent strength properties. Conductive nano-fillers such as carbon black and multi-walled carbon nanotube (MW

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13

HSU, CHIA-WEI, and 徐嘉偉. "Synthesis and Characterization of Radar Absorbing Materials of Ba1-XLaXFe12O19+0.5X/BaTiO3." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/49ed93.

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碩士<br>國防大學理工學院<br>化學工程碩士班<br>105<br>In this study, the high temperature was used to provide enough energy for fabricating the M-type microwave-absorbing materials Ba1-xLaxFe12O19-0.5x with the solid state reaction method. XRD patterns revel that the M-type Hexagonal crystal occurs along with α-Fe2O3 phases at 900℃ with 4 hours of a heating condition. When the temperature increased to 1300℃ in 4 hours, the alpha-Fe2O3 phases disappeared. It is also observed that the M-type Hexagonal crystal particle size increases with increasing temperature by using FE-SEM. The particle sized reaches up to 25u

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14

Angappan, M. "Investigation of Thin Films for Frequency Selective Surface Based Radar Absorbing Structures." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5657.

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Modern day stealth aircraft uses microwave absorbers for absorption of incident Radar signals transmitted by rival aircraft. Recently, several attempts were made to fabricate radar absorbing structures (RAS) of various configurations and embedding frequency selective surfaces (FSS), in the form of periodic 2-D patterns, is one of the approaches. The FSS is fabricated from resistive thin films which are usually coated on a dielectric substate. The use of thin films with optimum properties is essential for achieving broadband microwave absorption. For stealth aircraft structures, there exists a

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15

MICHELI, DAVIDE. "Design of Microwave Absorbing Structure and Microwave Shielding Structure by using Composite Materials, Nanomaterials and Evolutionary Computation." Doctoral thesis, 2011. http://hdl.handle.net/11573/495297.

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Questa tesi raccoglie il lavoro di tre anni di ricerche e studi nel settore dei nanomateriali, nanostrutture ed in generale dei compositi avanzati effettuati presso la Scuola di Ingegneria Aerospaziale della “Sapienza” Università di Roma. In particolare lo scopo è stato quello di approfondire l’interazione tra campi elettromagnetici ed alcune tipologie di compositi avanzati basati essenzialmente su strutture in carbonio e nanomateriali. Questo tentativo ha richiesto un approccio multidisciplinare tra diversi settori scientifici che comprendono quello dei materiali, delle strutture, dei process

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