| TOPIC: Transmission Lines and Waveguides |
| Manuscript Title: Analysis of cylindrical transmission lines using finite-element method coupled with cylindrical method of lines |
| Manuscript Id: IJMOT-2006-6-90 |
| Abstract: This paper presents a full-wave approach incorporating the finite-element method (FEM) and the cylindrical method of lines (CMoL) that can efficiently analyze a cylindrical transmission-line problem involving complex geometries and inhomogeneous materials. This method uses the FEM to model the regions containing complex geometric/material features, and adopts the CMoL to analyze the simple homogeneous cylindrical mediums. Since the complex regions are handled by FEM, it can effectively model the complex structures. Furthermore, due to the fact that the two-dimensional discretization of FEM is employed only in the complex parts of the problem domain while the homogeneous parts are efficiently treated by the CMoL with one-dimensional discretization, the number of unknowns to be computed in this method would be much fewer than that required by the standard FEM. Several typical cylindrical transmission lines are investigated to show the validity and capability of the FEM-CMoL method. |
| Authors: Hao-Hui Chen, Chen-Tse Lee, Young-Huang Chou, Rong-Chan Hsieh, Chin-Chih Yeh. |
Category: MicrowaveTechnology Submitted On: 7/27/2006 Full Text [PDF] Pg.Nos: 238-244
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| Manuscript Title: Transmission through an Aperture in a Plate with Surface Impedances in a Rectangular Waveguide |
| Manuscript Id: IJMOT-2006-6-124 |
| Abstract: Scattering through an aperture in a metal plate covered with lossy material such as noise absorbing
material in a rectangular waveguide was investigated theoretically and experimentally.
A surface impedance boundary condition was assumed for the covered plate to formulate the problem.
It was observed that noise absorbing sheets attached on a plate having a small aperture caused an
increase in the transmission coefficient. |
| Authors: Kuniaki Yoshitomi |
Category: MicrowaveTechnology Submitted On: 7/20/2006 Full Text [PDF] Pg.Nos: 245-252
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| Manuscript Title: Suppression of radiation from microstrip stubs by lossy chips |
| Manuscript Id: IJMOT-2006-6-136 |
| Abstract: For preventing radiation from MMIC passive elements, a method of attaching lossy chips near to the tips of stubs is available. However, the effectiveness of this method has not sufficiently been investigated. This paper makes clear, through thorough study based on numerical simulation, the effectiveness of the method of using lossy chips for reducing radiation. |
| Authors: N. Morita, Y. Ohsumi |
Category: MicrowaveTechnology Submitted On: 6/1/2006 Full Text [PDF] Pg.Nos: 253-258
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| Manuscript Title: Optimization Strategy for Multiport Waveguide Junctions with Canonical |
| Manuscript Id: IJMOT-2006-6-151 |
| Abstract: The strategy of optimising parameters of artificial discontinuities in multiport waveguide junctions is presented. This strategy is numerically illustrated for different canonical types of discontinuities, including conducting diaphragm, strip and circular rod. The numerical results for scattering characteristics of 3-port waveguide junctions with different types of discontinuities are discussed and optimal parameters of these discontinuities are predicted. |
| Authors: F.G. Bogdanov, G.Sh. Kevanishvili, G.V. Jandieri, K. Yasumoto |
Category: MicrowaveTechnology Submitted On: 6/12/2006 Full Text [PDF] Pg.Nos: 259-266
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| Manuscript Title: Transient Analysis of Stepped Transmission Lines Considered Fringing Capacitor |
| Manuscript Id: IJMOT-2006-6-173 |
| Abstract: This paper presents a numerical approach to the transient analysis of the stepped transmission line with a fringing capacitance. The approach bases on the modified central difference (MCD) method which combines with the boundary treatment introduced the signal flow graph for each junction with a fringing capacitance element. The transient behaviors on the stepped transmission line are demonstrated by new MCD simulation. Additionally, it is shown that the S-parameters are easily obtained from the Gaussian pulse responses. Some simulated results are represented to validate the usefulness of the proposed numerical method. |
| Authors: Kazuhito Murakami |
Category: MicrowaveTechnology Submitted On: 6/22/2006 Full Text [PDF] Pg.Nos: 267-274
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