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Studies of Harmonic Performance on PBG Via Structures
Tong Ming-Sze,Kim Hyeong-Seok,Lu Yilong The Korean Institute of Electrical Engineers 2005 KIEE International Transactions on Electrophysics Vol.5C No.2
This paper presents some interesting results regarding the harmonic performance on the photonic band-gap (PBG) structures formed by periodic conducting vias. Study on PBG structures has been one of the major topics in electromagnetics, microelectronics, and communications areas. In most of the studies, the band-gap filtering behavior was fulfilled by a periodic pattern of perforations on the ground planes of microstrip lines. Nevertheless, the PBG characteristics can also be realized using a periodic via-pattern along the transmission-line circuits. Hence, some of the via-typed PBG structures are studied and their frequency characteristics in terms of the scattering parameters are presented. It is found that by varying the length of vias with respect to the period pattern, different harmonic performances are observed.
Design and analysis of integrated-circuit package antenna (ICPA) for dual-band wireless transceivers
Tong, Ming-Sze,Yang, Mingwu,Cao, Qunsheng,Kim, Hyeong-Seok,Lu, Yilong,Chen, Yinchao,Chang, Tae-Gyu Wiley Subscription Services, Inc., A Wiley Company 2006 International journal of RF and microwave computer Vol.16 No.3
<P>This article presents study of a dual-band integrated-circuit package antenna (ICPA), which operates concurrently on dual bands at 2.4 and 5.25 GHz. The antenna is designed and printed on the top surface of an IC package and fed by a single coaxial line, while the transceiver is implemented on the opposite side of the package, through the separation of a common ground plate. This “cavity-down” arrangement minimizes the electromagnetic interference between the antenna and transceiver, and satisfies the miniaturization of the design. The study consists of numerical computations, which are performed through an in-house computer solver based on the nonuniform finite-difference time-domain (NU-FDTD) method and experimental measurements. Together with the data computed using the high-frequency structure simulator (HFSS) software, the results show excellent agreement between the numerical and experimental data, and the proposed structure is deemed as a useful application in the area of highly integrated wireless transceivers. © 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2006.</P>
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.
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>
Tae-Gyu Chang,Ming-Sze Tong,Hyeong-Seok Kim 한국전자파학회JEES 2005 Journal of Electromagnetic Engineering and Science Vol.5 No.1
Microwave or optical photonic band-gap(PBG) structures are conventionally realized by cascading distributive elements in a periodic pattern. However, the frequency bandwidth obtained through such plainly periodic arrangement is typically narrow, corporate with a relatively high rejection side-lobe band. To alleviate such problems, a design involving a chirping and tapering technique is hence introduced and employed. The design has been applied in both a planar stratified dielectric medium as well as a strip-line transmission line structure, and results are validated when compared with the corresponding conventional PBG structure.