DocumentCode :
893748
Title :
Periodic FDTD analysis of leaky-wave structures and applications to the analysis of negative-refractive-index leaky-wave antennas
Author :
Kokkinos, Titos ; Sarris, Costas D. ; Eleftheriades, George V.
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
Volume :
54
Issue :
4
fYear :
2006
fDate :
6/1/2006 12:00:00 AM
Firstpage :
1619
Lastpage :
1630
Abstract :
The determination of the attenuation constants of periodic leaky-wave structures via the finite-difference time-domain (FDTD) method has been pursued so far via the simulation of a number of unit cells that is large enough to guarantee the convergence of the computed value. On the other hand, Brillouin diagrams of periodic structures can be readily extracted via the simulation of a single unit cell, terminated in periodic boundary conditions. This paper demonstrates a methodology that enables the concurrent extraction of leaky-wave attenuation constants and Brillouin diagrams of periodic structures, through the FDTD simulation of a unit cell. The proposed methodology is first validated and then employed to model leaky-wave radiation from a two-dimensional negative-refractive-index transmission-line (NRI-TL) medium. Apart from evaluating the characteristics of forward and backward leaky-wave radiation from such a medium, a lumped-element macro-model, with element values determined from the FDTD simulation, is extracted. The FDTD analysis, combined with this equivalent circuit, is used to investigate theoretically the possibility of the NRI-TL medium, as a leaky-wave antenna, to achieve continuous scanning from backward to forward end-fire and broadside radiation.
Keywords :
antenna radiation patterns; antenna theory; finite difference time-domain analysis; leaky wave antennas; periodic structures; transmission line theory; Brillouin diagrams; attenuation constants; equivalent circuit; finite-difference time-domain method; leaky wave antennas; leaky wave structures; leaky-wave radiation; lumped-element macro-model; negative refractive index; periodic FDTD analysis; periodic boundary conditions; periodic structures; transmission line medium; Attenuation; Boundary conditions; Computational modeling; Convergence; Finite difference methods; Leaky wave antennas; Periodic structures; Termination of employment; Time domain analysis; Transmission lines; Complex propagation constants; finite-difference time-domain (FDTD) methods; leaky-wave antennas (LWAs); negative-refractive-index (NRI); periodic boundary conditions;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.2006.871367
Filename :
1618583
Link To Document :
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