Properties of Near and Far Fields for the Electric Line Source Illumination of a Lossy Metamaterial Covered Dielectric C
- PDF / 395,305 Bytes
- 12 Pages / 439.37 x 666.142 pts Page_size
- 18 Downloads / 148 Views
Properties of Near and Far Fields for the Electric Line Source Illumination of a Lossy Metamaterial Covered Dielectric Cylinder Hai-Long Wang & Qun Wu & Le-Wei Li & Jian Wu
Received: 28 December 2007 / Accepted: 18 January 2008 / Published online: 20 February 2008 # Springer Science + Business Media, LLC 2008
Abstract The electric field properties of the electric line source radiation in the presence of a lossy metamaterial covered dielectric cylinder are investigated. Firstly, the electromagnetic model configuration is given. The exact solution of the electromagnetic is presented. Secondly, the near field and the far field properties are investigated according to the electromagnetic and geometrical parameters. The different “focus” phenomenon, the directivities and the normalized radiation resistance are discussed and important conclusions are obtained. During all the numerical computation, the lossy conventional material covered dielectric cylinder is utilized as the reference. Keywords Metamaterial . Dielectric cylinder . Directivity . Radiation resistance
1 Introduction Quite recently, there has emerged a strong interest in exploring and exploiting the electromagnetic characteristics and properties of artificial materials, broadly referred to as metamaterial, left-handed material or negative index material, in which the real parts of both the permittivity and the permeability are negative. The metamaterial has some interesting physical phenomena, such as the reversal of the Doppler effect, the reversal of the Vavilov-Cerenkov effect, and perhaps most importantly, the negative refraction at a plane interface separating conventional material and metamaterial [1–4].
H.-L. Wang (*) : Q. Wu : L.-W. Li Harbin Institute of Technology, PO Box 341, Harbin, Heilongjiang 150001, China e-mail: [email protected] L.-W. Li Dept of Electrical & Computer Engineering, National University of Singapore, Singapore J. Wu National key Laboratory of Electromagnetic Environment, Beijing 102206, China
374
Int J Infrared Milli Waves (2008) 29:373–384
The lossless metamaterial slab has been of interest due to the so-called “perfect lens” [5]. Cylindrical [6–9] as well as spherical configurations [10–12] involving metamaterial have been investigated, as well. A considerable amount of work with regard to the development and applications of metamaterial, in general, has already been accomplished, as is evidenced by [13, 14]. Nevertheless, there is a continuing interest in further exploring the properties and potential applications of these materials in microwave and optical domain. The purpose of this paper is to study the electromagnetic model—a dielectric circular cylinder which is covered by lossy metamaterial and illuminated by a close-by ELS(Electric Line Source). (This type of illumination corresponds to TM polarization. The results for TE polarization, i.e., the magnetic line source illumination, could be obtained from the duality theorem, and are thus not included here). The electromagnetic characteristics of the model is
Data Loading...
