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- 저자 : Sauleau, Ronan (검색결과 2 건)
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Tong, Ming-Sze,Sauleau, Ronan,Rolland, Anthony,Chang, Tae-Gyu Wiley Subscription Services, Inc., A Wiley Company 2007 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.49 No.9
<P>Study of electromagnetic band-gap (EBG) structures has become a hot topic in computational electromagnetics. In this article, some EBG structures integrated inside a circular waveguide are studied. They are formed by a series of air-gaps within a circular dielectric-filled waveguide. A body-of-revolution finite-difference time-domain (BOR-FDTD) method is adopted for analysis of such waveguide structures, due to their axial symmetric properties. The opening ends of the waveguide are treated as a matched load using an unsplit perfectly matched layer technique. Excitations on a waveguide in BOR-FDTD are demonstrated. Numerical results of various air-gap lengths with respect to the period of separation are given, showing an interesting tendency of EBG behavior. A chirping-and-tapering technique is applied on the EBG pattern to improve the overall performance. The proposed EBG structures may be applied into antenna structures or other system for unwanted signal suppression. Results show that the BOR-FDTD offers a good alternative in analyzing axial symmetric configurations, as it offers enormous savings in computational time and memory comparing with a general 3D-FDTD algorithm. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2201–2206, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22668</P>
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Numerical analysis of PBG via structures using FDTD algorithm
Tong, Ming-Sze,Chen, Yinchao,Lu, Yilong,Kim, Hyeong-Seok,Chang, Tae-Gyu,Sauleau, Ronan Emerald Group Publishing Limited 2006 Microelectronics international Vol.23 No.1
<B>Purpose</B> ? To study the photonic band-gap (PBG) characteristics constructed by periodic conducting vias on various guided transmission-line structures. <B>Design/methodology/approach</B> ? The finite difference time domain (FDTD) method is adopted to analyze various PBG via structures. Conventionally, PBG characteristics on guided-wave structures, such as microstrip lines or coplanar waveguides (CPW), are constructed through a series of perforations on the ground plane(s). PBG characteristics can, however, also be realized through periodic arrangements of conducting vias located on the respective ground planes. <B>Findings</B> ? Through studies of the scattering parameters, it has been found that all analyzed PBG via structures exhibit strong band-gap characteristics in a particular frequency range. Different harmonic patterns are also observed when the dimensional sizes of the conducting vias vary with respect to the PBG period. <B>Research limitations/implications</B> ? Research has been mainly limited to study solely the PBG via structures, guided-wave transmission lines. More studies may be conducted in analyzing the overall performance when they are combined with other microwave components. <B>Practical implications</B> ? The proposed PBG via structures can be applied to various microwave areas, ranging from signal suppressions in microelectronics and mobile communications, to electro-magnetic interference studies in other practical electronic circuit structures. <B>Originality/value</B> ? The ideas of applying conducting vias on the guided-wave transmission lines and the proposed via patterns to induce the PBG characteristics are the research's claim to originality one.
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