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Title: March 2005 Full Journal Download
File Type: Journal Paper
Issue:Volume: 20      Number: 1      Year: 2005
Download Link:Click here to download PDF     File Size: 4893 KB

Title: Front Matter and Index
File Type: Journal Paper
Issue:Volume: 20      Number: 1      Year: 2005
Download Link:Click here to download PDF     File Size: 606 KB

Title: Generalization of Surface Junction Modeling for Composite Objects in an SIE/MoM Formulation Using a Systematic Approach
Abstract: This paper discusses the modeling of various kinds of surface junctions in an SIE/MoM formulation applied to complex objects consisting of arbitrarily shaped conducting and dielectric bodies. Methods of describing various types of junctions and systematically incorporating them in numerical solutions are presented. The procedures are of interest for the specific application of arbitrarily shaped dielectric resonator antennas and their associated feed structures and packaging. An E-PMCHWT forumation in conjuction with a moment method procedure using multi-domain RWG basis functions is presented to deal with such general junctions. Some results are verified with the FDTD method.
Author(s): J. Shin, A. W. Glisson, A. A. Kishk
File Type: Journal Paper
Issue:Volume: 20      Number: 1      Year: 2005
Download Link:Click here to download PDF     File Size: 491 KB

Title: Mode Expansion with Moment Method (ME-MM) to Analyze Dielectric Resonator Loaded Cavities
Abstract: An efficient hybrid Mode Expansion- (ME) Moment Method (MM) or ME-MM is proposed to simulate the eigenvalue problem of multi-layer dielectric resonators (DRs) within cylindrical and rectangular cavities. Resonant frequencies and field distributions for several DRs are presented. The method’s efficiency and accuracy are validated by comparison with commercial software, such as the HFSS, and other numerical methods. Finally, an air gap tunable DR analyzed via shows the ME-MM potential to design tunable DRs and filters.
Author(s): Z. Wang, S. Safavi-Naeini, J. L. Volakis
File Type: Journal Paper
Issue:Volume: 20      Number: 1      Year: 2005
Download Link:Click here to download PDF     File Size: 459 KB

Title: On Second-Order Asymptotic Expansions at a Caustic
Abstract: This paper presents a detailed analysis of second-order asymptotic expansions for the description of the geometrical optics field in the vicinity of a caustic. It is shown that the stationary phase solution commonly found in textbooks and papers is valid only at the caustic, but not away from the caustic, as is usually claimed. The exact stationary phase expansion is derived and is compared to the steepest desenct solitions presented elsewhere in literature.
Author(s): A. J. Booysen
File Type: Journal Paper
Issue:Volume: 20      Number: 1      Year: 2005
Download Link:Click here to download PDF     File Size: 794 KB

Title: NF–FF Transformation with Bi-Polar Scanning From Nonuniformly Spaced Data
Abstract: An efficient probe compensated near-field–far-fieldtransformation technique from irregularly spaced bi-polar samples is developed in this paper. The singularvalue decomposition method is applied to recover theuniformly distributed data, whose position is fixed by anonredundant sampling representation of theelectromagnetic field. Then an optimal samplinginterpolation algorithm is used for reconstructing theplane-rectangular samples required to carry out thestandard near-field–far-field transformation. This laststep is required to benefit by the use of FFT algorithm.Numerical examples are reported to assess theeffectiveness of the proposed technique.
Author(s): F. Ferrara, C. Gennarelli, M. Iacone, G. Riccio
File Type: Journal Paper
Issue:Volume: 20      Number: 1      Year: 2005
Download Link:Click here to download PDF     File Size: 226 KB

Title: Electromagnetic Modeling of an Adaptable Multimode Microwave Applicator for Polymer Processing
Abstract: This paper presents the electromagnetic modeling of a novel adaptable multi-feed multimode cylindrical cavity applicator where the spatial distribution of the electric field can be specified a priori to accomplish a desired processing task. The electric field intensity inside the cavity can be tailored by just varying the power delivered to each port, and the mode-switching can be realized without mechanically adjusting the cavity dimensions. An orthogonal feeding mechanism is developed to reduce the cross coupling between the ports. Numerical simulations are performed for the cavity applicator to verify the theoretical analysis.
Author(s): R. Sun, L. C. Kempel, L. Zong, S. Zhou, M. C. Hawley
File Type: Journal Paper
Issue:Volume: 20      Number: 1      Year: 2005
Download Link:Click here to download PDF     File Size: 856 KB

Title: Comparative Evaluation of Some Empirical Design Techniques for CAD Optimization of Wideband U-Slot Microstrip Antennas
Abstract:
Author(s): V. Natarajan, D. Chatterjee
File Type: Journal Paper
Issue:Volume: 20      Number: 1      Year: 2005
Download Link:Click here to download PDF     File Size: 597 KB

Title: BROADBAND ANTENNA RESPONSE USING HYBRID TECHNIQUE COMBINING FREQUENCY DOMAIN MoM AND FDTD
Abstract: A hybrid technique is proposed for computation of broadband characteristics of an antenna in the presence of a dielectric scatterer. The technique links the frequency domain Method of Moments (MoM) and the Finite Difference Time Domain (FDTD) method. The coupling of these methods is achieved by using the Equivalence Principle, applied over the intervening surface. A great reduction in computation time is achieved in the MoM domain by using an impedance interpolation technique. The Gaussian pulse (GP) and Derivative Gaussian pulse (DGP) are investigated as the excitation sources for the MoM. Examples are given and the results found to be in good agreement with alternative methods.
Author(s): R. A. Abd-Alhameed, P. S. Excell, M. A. Mangoud
File Type: Journal Paper
Issue:Volume: 20      Number: 1      Year: 2005
Download Link:Click here to download PDF     File Size: 443 KB

Title: An Optimized High-Order Implicit FDTD Solver with One-Sided TF/SF for Simulation of Photonic Devices
Abstract: In this paper an optimized high-order implicit finite difference time domain (FDTD) solver with one-sided total-field/scattered-field (TF/SF) excitation is developed for numerical simulation of integrated optical components. The optimized FDTD algorithm reduces the number of operations and the storage requirements to perform the matrix inversion using LU decomposition. It is shown that the one-sided TF/SF formulation is more accurate in launching the exact power into the simulation domain as well as decreasing the load on the PML-ABCs. The implementation of this tool was done in the Prometheus program, a software package of Kymata Netherlands.
Author(s): H. A. Abdallah
File Type: Journal Paper
Issue:Volume: 20      Number: 1      Year: 2005
Download Link:Click here to download PDF     File Size: 972 KB

Title: Multiresolution Time Domain Based Different Wavelet Basis Studies of Scattering of Planar Stratified Medium and Rectangular Dielectric Cylinder
Abstract: In this paper, several wavelet bases, namely, the Daubechies, the biorthogonal Coiflet, the Deslauriers-Dubuc interpolating functions, and the cubic spline Battle-Lemarie, are applied to the multiresolution time domain (MRTD) technique for planar stratified media and electromagnetic scattering. These MRTD schemes are studied via field expansions of the scaling functions in one-dimensional (1D) and two-dimensional (2D) cases. A rigorous treatment method for inhomogeneous media structures is given. We have focused here on the study of reflected and transmission coefficients for an electromagnetic wave propagation on a stratified slab media and the scattering width (SW) of a rectangular dielectric cylinder. The 1D propagation characteristics of single and periodical stratified media and the 2D scattering width of the MRTD schemes are compared with the results of the FDTD method. Finally, we describe the computational accuracy of the relative peaks and shifting position errors, via a comparison of the results of the MRTD scheme based on the different basis with those of the FDTD method.
Author(s): Q. Cao, K. K. Tamma
File Type: Journal Paper
Issue:Volume: 20      Number: 1      Year: 2005
Download Link:Click here to download PDF     File Size: 639 KB