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[IEEE 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) - Espoo, Finland (2018.8.27-2018.9.1)] 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) - Modular approach to understanding and synthesis of metamaterials and metasurfaces
摘要： The vast majority of previously proposed metamaterials and metasurfaces are anisotropic or bianisotropic (exhibiting magnetoelectric coupling). Nevertheless, their anisotropy was not fully exploited as they were designed only for one or several specific illumination directions. In this talk, we propose a simple analytical approach to characterize properties of general bianisotropic meta-atoms for an arbitrary illumination. The approach is based on the qualitative decomposition of an arbitrary meta-atom into separate basic “modules” with elementary polarization properties. Such decomposition can be used for comprehensive characterization of previously designed structures as well as for synthesizing novel bianisotropic inclusions of arbitrary complexity and with desired response.
关键词： polarization properties,anisotropy,metamaterials,bianisotropic,metasurfaces,magnetoelectric coupling
更新于2025-09-10 09:29:36
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EFFECTS OF REENTRY PLASMA FLUCTUATION ON POLARIZATION PROPERTIES OF ELECTROMAGNETIC WAVES
摘要： Fluctuations of the reentry plasma sheath can a?ect the propagation of Electromagnetic waves. The relations between ?uctuations and the propagation of electromagnetic waves are analyzed. The e?ects on polarization properties in L-band, S-band and Ka-band during a typical reentry process are studied using methods derived by synthesizing the compressible turbulent ?ow theory, plasma theory, and electromagnetic wave theory together. Results show that in L-band and S-band, the e?ects increase with the altitude, while in Ka-band, the e?ects decrease with altitude. The e?ects at high altitude above 60 km are prominent in L-band and S-band, while the e?ects at middle and low altitude below 60 km in Ka-band are obvious. The e?ects in L-band and S-band are much bigger than that in Ka-band and can a?ect the signal properties of TT&C systems signi?cantly, while the e?ects in Ka-band are much milder. The waves with large oblique incident angle can encounter much more severe conditions than that with small angle.
关键词： Ka-band,reentry plasma sheath,polarization properties,electromagnetic waves,L-band,S-band
更新于2025-09-09 09:28:46
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POLARIZATION TRANSFORMATION BY A HYPERBOLIC METAMATERIAL ON A METAL SUBSTRATE
摘要： In the present paper we focus on the study of polarization properties of biaxial metamaterial, which consist of alternate ferrite and semiconductor layers, located on an ideally conducted metal substrate. The system is placed into an external magnetic field along the boundaries of the layers. The effective medium theory is applied. Effective linear-to-elliptic polarization conversion has been shown, by means of physical and geometrical parameters of the system under consideration.
关键词： biaxial metamaterial,ferrite,linear-to-elliptic polarization conversion,metal substrate,polarization properties,semiconductor layers,external magnetic field,effective medium theory
更新于2025-09-04 15:30:14