Bibliographies thématiques / MU NEGATIVE MEDIA (MNG)

Littérature scientifique sur le sujet « MU NEGATIVE MEDIA (MNG) »

Auteur : Grafiati
Publié le 11 septembre 2023

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Articles de revues sur le sujet "MU NEGATIVE MEDIA (MNG)"

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Greegor, R. B., C. G. Parazzoli, J. A. Nielsen, M. H. Tanielian, D. C. Vier, S. Schultz, C. L. Holloway et R. W. Ziolkowski. « Demonstration of Impedance Matching Using a mu-Negative (MNG) Metamaterial ». IEEE Antennas and Wireless Propagation Letters 8 (2009) : 92–95. http://dx.doi.org/10.1109/lawp.2008.2011570.

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Webb, Bruce A., et Richard W. Ziolkowski. « A Metamaterial-Inspired Approach to Mitigating Radio Frequency Blackout When a Plasma Forms Around a Reentry Vehicle ». Photonics 7, no 4 (6 octobre 2020) : 88. http://dx.doi.org/10.3390/photonics7040088.

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Radio frequency (RF) blackout and attenuation have been observed during atmospheric reentry since the advent of space exploration. The effects range from severe attenuation to complete loss of communications and can last from 90 s to 10 min depending on the vehicle’s trajectory. This paper examines a way of using a metasurface to improve the performance of communications during reentry. The technique is viable at low plasma densities and matches a split-ring resonator (SRR)-based mu-negative (MNG) sheet to the epsilon-negative (ENG) plasma region. Considering the MNG metasurface as a window to the exterior of a reentry vehicle, its matched design yields high transmission of an electromagnetic plane wave through the resulting MNG-ENG metastructure into the region beyond it. A varactor-based SRR design facilitates tuning the MNG layer to ENG layers with different plasma densities. Both simple and Huygens dipole antennas beneath a matched metastructure are then employed to demonstrate the consequent realization of significant signal transmission through it into free space beyond the exterior ENG plasma layer.
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Negi, Deepa, Rajesh Khanna et Jaswinder Kaur. « Design and performance analysis of a conformal CPW fed wideband antenna with Mu-Negative metamaterial for wearable applications ». International Journal of Microwave and Wireless Technologies 11, no 08 (6 mai 2019) : 806–20. http://dx.doi.org/10.1017/s1759078719000497.

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AbstractIn this paper, a flexible CPW fed ultrawide band (UWB) antenna with mu-negative (MNG) metamaterial is designed, fabricated, and tested for wearable applications. Initially, a UWB antenna of size 50 mm × 43 mm is fabricated on two different substrates, viz. flexible FR4 and semi-flexible Rogers RT/duroid 5880. A metamaterial structure fabricated on flexible FR4 shows a magnetic resonance from 7.2 GHz to 9.2 GHz with maximum stop band attenuation (−49 dB) and high MNG value (−2121.6) at 7.87 GHz. Then a (3 × 3) array of designed MNG metasurface is used as ground plane with flexible UWB antenna, which improves its overall gain and radiation pattern. The performance of the flexible antenna with/without metamaterial at various distances from flat and cylindrical three-layered human phantom of skin, fat, and muscle is studied. Further, the bending characteristics at different angles and performance over thin metallic sheet is also evaluated. Additionally, the peak specific absorption rate value averaged over 1 g of tissue at three chosen frequencies from UWB range (3, 5, 10 GHz) with/without metamaterial using 0.3 and 0.1 W of input power is also analyzed. The simulated and measured results are in good agreement which confirms that the designed antenna is a good candidate for wearable applications.
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Komeylian, S., et F. Hojjat-Kashani. « Reducing radar cross section by investigation electromagnetic materials ». Advanced Electromagnetics 1, no 3 (11 décembre 2012) : 111. http://dx.doi.org/10.7716/aem.v1i3.98.

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Decreasing the Radar Cross Section (RCS) is investigated in electromagnetic materials, i.e. double-positive (DPS) , double-negative (DNG) , epsilon-negative (ENG) and mu-negative (MNG) materials. The interesting properties of these materials lead to a great flexibility in manufacturing structures with unusual electromagnetic characteristics. The valid conditions for achieving the transparency and gaining resonance for an electrically small cylinder are established, in this corresponding The effect of incidence direction on RCS inclusive of transparency and resonance conditions is also explored ,through computer simulations for an electrically small cylinder.
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Simorangkir, Roy B. V. B., et Yongshik Lee. « A Planar Dual-Band Periodic Leaky-Wave Antenna Based on a Mu-Negative (MNG) Transmission Line ». IEEE Transactions on Antennas and Propagation 63, no 5 (mai 2015) : 2370–74. http://dx.doi.org/10.1109/tap.2015.2410802.

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Lee, Jae-Gon, et Jeong-Hae Lee. « Compact zeroth-order resonator (ZOR) antennas ». EPJ Applied Metamaterials 6 (2019) : 6. http://dx.doi.org/10.1051/epjam/2019002.

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In this paper, we introduce and review the zeroth-order resonator (ZOR) antennas with outstanding characteristics including various applications that have been researched so far. Since the zeroth-order resonance frequency is independent of a physical length of antenna, the ZOR antenna can theoretically be designed quite small and have a possibility to apply to considerably lots of applications. First, we have presented the ZOR antennas implemented by double-negative (DNG), epsilon-negative (ENG), and mu-negative (MNG) transmission lines. Then, the research related on extremely small, wide beamwidth, wideband, and circularly polarized (CP) ZOR antennas have been continuously carried out. Based on a series of these studies, the ZOR antennas were utilized for various applications such as a wireless power transfer (WPT), a compact controlled reception pattern antenna (CRPA), a penta-band mobile antenna, and a wide steering array antenna.
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Tan, Wei, Zhiguo Wang et Hong Chen. « COMPLETE TUNNELING OF LIGHT THROUGH MU-NEGATIVE MEDIA ». Progress In Electromagnetics Research M 8 (2009) : 27–37. http://dx.doi.org/10.2528/pierm09060201.

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Castaldi, G., I. Gallina, V. Galdi, A. Alù et N. Engheta. « Transformation-optics generalization of tunnelling effects in bi-layers made of paired pseudo-epsilon-negative/mu-negative media ». Journal of Optics 13, no 2 (30 novembre 2010) : 024011. http://dx.doi.org/10.1088/2040-8978/13/2/024011.

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Raterman, H. G., A. E. Voskuyl, S. Simsek, M. W. J. Schreurs, I. M. W. van Hoogstraten, M. J. L. Peters, V. P. van Halm et al. « Increased progression of carotid intima media thickness in thyroid peroxidase antibodies-positive rheumatoid arthritis patients ». European Journal of Endocrinology 169, no 6 (décembre 2013) : 751–57. http://dx.doi.org/10.1530/eje-13-0394.

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ObjectiveAutoimmune diseases such as rheumatoid arthritis (RA) and hypothyroidism tend to cluster, and this coexistence amplifies the elevated cardiovascular risk in RA. Whether thyroid peroxidase antibodies (TPOabs) are associated with increased cardiovascular disease (CVD) risk has not been studied extensively. Therefore, this study determined firstly the prevalence of TPOabs in RA and secondly whether TPOabs were associated with CVD. Moreover, this study explored whether TPOabs were related to RA characteristics.Design and methodsData from the CARRÉ Study, an ongoing study investigating CVDs and its risk factors in RA (n=322), was used to ascertain the prevalence of TPOabs in RA patients. In addition, cardiovascular and RA disease characteristics were compared between TPOabs-positive and -negative patients at baseline and at a second visit after 3 years.ResultsTPOabs were present in 47/322 (15%) RA patients and TSH levels were higher in TPOabs-positive patients (1.40 mU/l) compared with TPOabs-negative patients (1.26 mU/l, P=0.048). At baseline and after 3 years no association was observed between TPOabs and (risk factors for) CVD. Regression analyses revealed a significantly larger progression of carotid intima media thickness (cIMT; β=0.13 mm) in TPOabs-positive compared with TPOabs-negative patients independent of risk factors for cIMT progression. RA disease activity scores (DAS28) were higher in TPOabs-positive compared with TPOabs-negative patients (4.4 vs 3.8 P=0.018).ConclusionsTPOabs were associated with increased cIMT progression. Moreover, an association between TPOabs and DAS28 was observed. Hence, TPOabs seems to have a role in the amplified cardiovascular risk in RA patients.
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Makarov, V. P., et A. A. Rukhadze. « Material equations and Maxwell's equations for isotropic media ; waves with negative group velocity and negative values of $ \varepsilon$($ \omega$) and $ \mu(\omega)$ ». Physics-Uspekhi 62, no 5 (31 mai 2019) : 487–95. http://dx.doi.org/10.3367/ufne.2019.01.038522.

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Chapitres de livres sur le sujet "MU NEGATIVE MEDIA (MNG)"

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Christina Josephine Malathi, Andrews. « Study on Miniaturization of Antenna Using Metamaterials ». Dans Metamaterials - History, Current State, Applications, and Perspectives [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.106222.

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Metamaterials (MTMs) are artificially built materials intended to give its properties from the internal structure, rather than the chemical composition found in natural materials. Electric permittivity (ε) and magnetic permeability (μ) are the two basic parameters which describe the electromagnetic property of a material or medium. Permittivity describes how a material is affected when it is placed in electric field. And permeability describes how a material is affected in presence of magnetic field. Metamaterials may have either negative permittivity or permeability or both may be negative simultaneously. The concept of metamaterials has additionally been utilized to design different kinds of patches with upgraded performance, such as improved gain and enhanced efficiency. Also, it has been utilized for the scaling down of patches. Two parameters are utilized in the collected works for antennas using metamaterials. We can adjust the refractive index of the metamaterial to positive, near-zero or negative values. Utilization of epsilon negative, MNG (μ - Mu negative) or DNG (double negative) are called metamaterial- based antennas and the use of metamaterial unit cell for example complementary split ring resonator, split ring resonator and so on are alluded as metamaterial inspired antennas. The design of complementary split ring resonator and its equivalent circuit will be discussed in this work. CSRR (complementary split ring resonator) provides both isolation enhancement and miniaturization for MIMO antenna.
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Actes de conférences sur le sujet "MU NEGATIVE MEDIA (MNG)"

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Girish, K., R. U. Nair et Hema Singh. « Parametric analysis of radar cross section (RCS) of cylinder coated with epsilon-negative (ENG) and Mu-negative (MNG) metamaterials ». Dans 2016 11th International Conference on Industrial and Information Systems (ICIIS). IEEE, 2016. http://dx.doi.org/10.1109/iciinfs.2016.8262898.

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Feng, Tuanhui, Yunhui Li, Hong Chen et Yunlong Shi. « Light tunneling in a pair structure consisting of epsilon-negative and mu-negative media ». Dans Photonics Asia 2007, sous la direction de Guangcan Guo, Songhao Liu, Guofan Jin, Kees A. Schouhamer Immink, Keiji Shono, Chris A. Mack, Jinfeng Kang et Jun-en Yao. SPIE, 2007. http://dx.doi.org/10.1117/12.757445.

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