When periodic structures interact with electromagnetic waves
amazing features result. In particular, characteristics such as
frequency stop-bands, pass-bands and band-gaps could be identified.
Surveying the literature, one observes that various terminology have
been used depending on the domain of the applications. These
applications are seen in filter designs, gratings, frequency selective
surfaces (FSS), photonic crystals and band-gaps (PBG), etc. We classify
them under the broad terminology of “electromagnetic band-gaps
(EBG)”. The focus of this paper is to present a powerful
computational engine utilizing finite difference time domain (FDTD)
technique integrated with the Prony method to analyze and understand the
unique propagation characteristics of different classes of complex EBG
structures such as, (a) FSS structures, (b) PBG crystals, (c) smart
surfaces for communication antenna applications, (d) surfaces with
perfectly magnetic conducting properties (PMC), (e) creation of
materials with negative permittivity and negative permeability, (f)
surfaces with reduced edge diffraction effects, and (g) the notion of
equivalent media. The performance of two types of the EBG structures
namely, single and multi-layered tripod FSS, and rectangular, triangular
and woodpile PBG crystals is detailed. Some of the potential
applications of these structures are highlighted
"When they interact with electromagnetic waves, exciting phenomena appear and amazing features result. In particular, characteristics such as frequency stop bands, pass bands and band gaps could be identified using Electromagnetic Band gap Structure         . Generally speaking, (EBG) structures are defined as artificial periodic (or sometimes non-periodic) objects that prevent/assist the propagation of electromagnetic waves in a specified band of frequency for all incident angles and all polarization states . "
[Show abstract][Hide abstract] ABSTRACT: The concept of using Electromagnetic Band Gap (EBG) structures is to provide excellent suppression of noise or interference (EMI) at GHz frequencies. In this work, a 3x3 spiral EBG planar structure was developed to achieve suppression of electromagnetic interference covering frequency range of 4 to 6 GHz considering the integration of EBG structure into the High Speed printed Circuit Board design (HSPCB).
"S photonic band-gap materials (PBGs) in Optics , electromagnetic band-gap structures (EBGs) are periodic patterns that exhibit a band of frequencies in which the electromagnetic propagation is not allowed in the microwave range . EBG structures have a wide range of applications in antennas, amplifiers, filters, microwave cavities, etc -. "
[Show abstract][Hide abstract] ABSTRACT: This letter presents a novel electromagnetic band-gap (EBG) structure in microstrip technology based on nonuniform one-dimensional (1-D) Koch fractal patterns whose dimensions and period are modulated by a tapering function that significantly improves the width of the band-gap. This wide band-gap is achieved by maintaining the radius-to-period ( r / a ) ratio of the Koch fractal patterns larger than 0.5 in the whole structure. In the passband region, an improved flat response is obtained by tapering the dimensions of the Koch fractal patterns etched in the ground plane, together with the width of the microstrip line, with a Kaiser distribution that also modulates the periodicity of the fractals. A major consequence of this modulation of the periodicity of the pattern is that this structure is much more compact than a uniform conventional one.
"Electromagnetic band gap structures are defined as artificial periodic or non-periodic objects that prohibit the propagation of electromagnetic waves in a specified frequency band for all incident angles and all polarization states . EBG structures are normally constructed by periodic arrangement of metallic conductors grounded with metallic vias on a dielectric material. "
[Show abstract][Hide abstract] ABSTRACT: In this paper, a comparative study of different shapes of electromagnetic band gap (EBG) structure is presented. Four different shapes of EBG structure are investigated which are mushroom-like EBG structure, circular EBG structure, fractal EBG structure, and slotted patch EBG structure. The method of suspended transmission line is used to determine the characteristic of stop band frequency of each shape. The single element design is studied where each shape requires the same area which is 12 mm x 12 mm. The value of forwards transmission coefficient, S 21 is investigated for each case. From the simulation, each shape gives different range of stop band frequency. It is found that the slotted patch EBG gives the best result which can obtain lowest operating frequency, dual frequency band and excellent S 21 value. Index Terms—Electromagnetic band gap, Stop band frequency, Method of suspended transmission line, antenna application.
Indonesia-Malaysia Microwave Antenna Conference (IMMAC2010), Jakarta - Indonesia; 06/2010
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