EPJ Applied Metamaterials最新文献_第8页

FDTD modeling of nonperiodic antenna located above metasurface using surface impedance boundary condition 基于表面阻抗边界条件的超表面非周期天线时域有限差分建模

IF 1.6

EPJ Applied Metamaterials Pub Date : 2019-01-01 DOI: 10.1051/EPJAM/2019014

T. Uno, T. Arima, Akihide Kurahara

{"title":"FDTD modeling of nonperiodic antenna located above metasurface using surface impedance boundary condition","authors":"T. Uno, T. Arima, Akihide Kurahara","doi":"10.1051/EPJAM/2019014","DOIUrl":"https://doi.org/10.1051/EPJAM/2019014","url":null,"abstract":"This paper investigates an FDTD modeling method for precisely calculating the characteristics of a single, that is, a nonperiodic antenna located above a metasurface that consists of an infinite periodic conducting element on a flat dielectric substrate. The original FDTD method requires enormous computational resources to analyze such structures because an appropriate periodic boundary condition (PBC) is not supported, and a brute force approach has to be used for this reason. Another option is to use the array scanning method in which a single source is synthesized from a superposition of infinite phased array of point sources. In this method, some problems such as a mutual coupling between the single antenna and the metasurface, a computational error contained in a numerical integration over the Brillouin zone and so on have not been resolved yet. In order to resolve these difficulties and to reduce computational resources, a surface impedance boundary condition (SIBC) is incorporated into the FDTD method in this paper. The validity of the method is numerically confirmed by calculating an input impedance and a radiation pattern of a horizontal dipole antenna located above the metasurface.","PeriodicalId":43689,"journal":{"name":"EPJ Applied Metamaterials","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1051/EPJAM/2019014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57822726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Compact zeroth-order resonator (ZOR) antennas 紧凑的零阶谐振器(ZOR)天线

IF 1.6

EPJ Applied Metamaterials Pub Date : 2019-01-01 DOI: 10.1051/EPJAM/2019002

Jae‐Gon Lee, Jeong‐Hae Lee

引用次数: 4

Electrically small multiband antenna based on spoof localized surface plasmons 基于欺骗局域表面等离子体的电小型多波段天线

IF 1.6

EPJ Applied Metamaterials Pub Date : 2019-01-01 DOI: 10.1051/EPJAM/2019009

Rong Lin Shao, Bo Li, Liu Yang, Y. Zhou

引用次数: 9

Active coated nano rod antennas for enhanced and directive scattering phenomena 用于增强和定向散射现象的有源涂层纳米棒天线

IF 1.6

EPJ Applied Metamaterials Pub Date : 2019-01-01 DOI: 10.1051/epjam/2019016

S. Arslanagić, R. E. Jacobsen

{"title":"Active coated nano rod antennas for enhanced and directive scattering phenomena","authors":"S. Arslanagić, R. E. Jacobsen","doi":"10.1051/epjam/2019016","DOIUrl":"https://doi.org/10.1051/epjam/2019016","url":null,"abstract":"The scattering properties of a range of symmetric and asymmetric active coated nano rod antennas are investigated numerically. The active nano rods are composed of a silica dioxide nano-core coated with a silver nano-shell, and with a canonical gain model implemented into their nano-core regions. The asymmetric nano rods are obtained through suitable perforations of their nano-shell and/or nano-core regions. In all cases, active nano rods are found to exhibit super-resonant phenomena with significantly enhanced scattered fields for an incident plane wave having the magnetic field parallel to the rod axis. While the dipole-mode response in the symmetric cases is only weakly directive, the asymmetric cases stimulate an abundant emission of higher order modes furnishing rather enhanced and directive near-fields. As the length of the symmetric nano rods decreases, more gain is needed to achieve a super-resonant response, which also was found to be blue-shifted. For asymmetric cases, the gain was lowered, and the response got blue-shifted as the asymmetry increased. The proposed active nano rod antennas provide a new class of antennas with desirable wavelength tunability and polarization-dependent scattering properties; this makes them interesting candidates for many nano-photonic applications. Moreover, the proposed geometries bridge the important gap between the two often considered canonical geometries, namely, spherical and infinitely long cylindrical particles. The detailed knowledge of gain values and resonant wavelengths provided in here is crucial for a successful combination of such particles with realistic gain materials.","PeriodicalId":43689,"journal":{"name":"EPJ Applied Metamaterials","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1051/epjam/2019016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57822767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

U-slot patch antenna with low RCS based on a metaferrite substrate 基于超铁氧体衬底的低RCS u槽贴片天线

IF 1.6

EPJ Applied Metamaterials Pub Date : 2019-01-01 DOI: 10.1051/epjam/2019020

Yujie Liu, P. Beal, H. Giddens, Y. Hao

引用次数: 1