The analysis of near and far field pattern through mode analysis and FFT in a finite periodic dielectric gratings
Published date | 09 March 2015 |
Date | 09 March 2015 |
Pages | 82-90 |
DOI | https://doi.org/10.1108/JSIT-11-2013-0056 |
Author | Tae-Bong Lee,Min-Nyeon Kim |
Subject Matter | Information & knowledge management,Information systems |
The analysis of near and far
eld pattern through mode
analysis and FFT in a nite
periodic dielectric gratings
Tae-Bong Lee
Department of Electronics and Communication, Gachon University,
Sungnam, Republic of Korea, and
Min-Nyeon Kim
Division of Information and Communication Engineering,
Baeseok University, Cheonan, Korea
Abstract
Purpose – The purpose of this paper is to analyze far and near eld emitted eld patterns through
more exact calculation of the modes formed in nite periodic dielectric gratings.
Design/methodology/approach – For the mode calculation, equations are newly dened by
applying vertical boundary condition on the assumption that transverse electric modes are generated in
the structure. After nding modes, near eld patterns are calculated using the wave number and
coefcient of the mode.
Findings – Additionally, the results from these calculations are compared with that of the
rigorous-coupled method. Finally, far eld patterns are derived by applying fast Fourier transform to
near eld patterns and also compared with the results of rigorous-coupled method.
Research limitations/implications – For convenience of coordinate, we use rectangular
coordinate, though the shape of radome is a hemisphere.
Practical implications – In this paper, the authors derive more exact near eld patterns without the
assumption of inniteness so that these results can be used practically for a making real
frequency-selective structure.
Originality/value – Conventional periodic nite dielectric gratings analysis has been done using
Floquet–Bloch wave theory, coupled-mode, rigorous-coupled method which is based on the assumption
of inniteness of the structure.
Keywords Far eld pattern, Finite periodic dielectric gratings, Frequency-selective structure,
Near eld pattern
Paper type Research paper
1. Introduction
Periodic dielectric gratings which have many characteristics including
frequency-selective property are evaluated to be useful for various applications (Bertoni
et al., 1989;Parker et al., 2008;Hook and Ward, 2004;Vardaxoglou, 1997;Munk, 2000;
Parker and Hamdy, 1981;Wu et al., 1992;Edenhofer and Alpaslan, 2005). Specically, it
can be applied for surface-emitted antenna and coupler.
Conventional periodic innite dielectric gratings analysis has been done using
Floquet-Bloch’s coupled-mode or rigorous-coupled method which is based on the
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JSIT
17,1
82
Received 7 November 2013
Revised 17 March 2014
Accepted 19 March 2014
Journalof Systems and
InformationTechnology
Vol.17 No. 1, 2015
pp.82-90
©Emerald Group Publishing Limited
1328-7265
DOI 10.1108/JSIT-11-2013-0056
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