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Title: ACES Journal May 2015 Cover
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
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Title: ACES Journal May 2015 Front/Back Matter
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 29 KB

Title: ACES Journal May 2015 Full
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 12043 KB

Title: 60 GHz Circular Patch-Fed High Gain Transparent Lens Antenna
Abstract: A high gain, low cost and easy to fabricate millimeter-wave (MMW) antenna is presented. To focus the radiation into a very thin main beam, a concept based on employing a cylindrical air cavity with a convex front-end linking a microstrip patch radiator and a transparent dielectric lens is introduced. This principle is applied to enhance the coupling between the patch antenna and dielectric lens at 60 GHz. The design shows very directive and stable radiation patterns in both the E and H-planes. The proposed antenna exhibits a measured gain of 20 dB over the ISMband, as well as high radiation efficiency (greater than 90%). The performance of the proposed antenna makes it a promising solution for various MMW applications, including short distance wireless communications and MMW imaging.
Author(s): Z. Briqech, A. R. Sebak, T. Denidni
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 4272 KB

Title: Systematic Analysis on the Optical Properties of Chiral Metamaterial Slab for Microwave Polarization Control
Abstract: Theoretical and numerical of investigation of the chiral slab exhibiting polarization rotation is presented in detail. The effects of the chirality, thickness of medium, dielectric constant, and incident angle are analyzed in order to display the characteristic features of the chiral slab both for TE and TM incident waves. The chiral slab then is realized by using a full wave EM simulation software in order to validate the numerical results in which the numerical and simulation results are in good agreement with each other. Different than the other studies existing in literature, the proposed model shows optimum results for wide frequency band by using small chirality which is sufficient for polarization rotation. From the results, it is observed that the proposed system and its realization can be effectively used as a polarization converter and EM filters at some frequencies.
Author(s): I. Comez, M. Karaaslan, F. Dincer, F. Karadag, C. Sabah
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 1066 KB

Title: A Fourth Order FDFD Approach for the Analysis of Sectorial Elliptic Waveguides
Abstract: We present a fourth order frequency domain finite difference approach (FDFD) in curvilinear coordinates for the computation of the modes of sectorial and ridged elliptic waveguides. The use of an elliptic mesh allows to avoid usual the staircase approximations of the boundary, providing a very effective and accurate procedure.
Author(s): A. Fanti, L. Deias, G. A. Casula, G. Montisci
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 762 KB

Title: A Vector Parabolic Equation Method Combined with MLFMM for Scattering from a Cavity
Abstract: The three-dimensional vector parabolic equation (PE) method was used for the fast analysis of the electromagnetic scattering with reasonable accuracy. The algorithm was marched from plane to plane along some preferred directions so that the computational load could be reduced significantly. However, large errors will be introduced for cavities with the multiple scattering. In this paper, the vector parabolic equation method combined with the multilevel fast multipole method (MLFMM) is presented for the analysis of the electromagnetic scattering from a cavity. Numerical results demonstrate that the proposed technique can efficiently give reasonably accurate results for the cavities when compared with the conventional PE method.
Author(s): Z. He, Z. H. Fan, D. Z. Ding, R. S. Chen
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 352 KB

Title: Scattering from an Arbitrarily Incident Plane Wave by a PEMC Elliptic Cylinder Confocally Coated with a Chiral Material
Abstract: An analytic solution to the problem of scattering of a plane electromagnetic wave by a chirally coated elliptic cylinder defined by PECM boundary condition has been obtained by expanding the different electromagnetic fields in terms of appropriate elliptic wave functions and a set of expansion coefficients. The expansion coefficients associated with the transmitted field inside the coating as well as the scattered field outside the coating are unknown and will be obtained by applying the boundary conditions at various layers. Numerical results have been presented graphically to show the effects of chiral and PEMC materials simultaneously on the bistatic width of scattering from coated elliptic cylinder.
Author(s): A-K. Hamid
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 460 KB

Title: Design of Compact and Wideband Suppression Low Pass Elliptic Filter by n-Segment Step Impedance Transmission Line
Abstract: In this paper, the invasive weed optimization technique for compacting a microstrip elliptic low pass filter is proposed and validated. At the first step, the invasive weed optimization (IWO) technique is used to replace the shunt resonators transmission lines of the conventional filter with arbitrary n-segments Step Impedance Transmission Lines (SITLs) for compacting it. To validate the proposed method, the shunt resonator transmission lines of a seventh-order elliptic lowpass filter are replaced with proper SITLs which cause more than 30% compactness in this step. Then the IWO technique is applied on the general filter configuration to design a wideband harmonic suppression and compact elliptic low pass filter. This method extends the stop band bandwidth more than 8.5 f0 and also increases the compactness to 47%. The measurement results of the final optimized fabricated filter are in good agreement with the simulation ones.
Author(s): M. Hayati, M. Amiri, S. H. Sedighy
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 561 KB

Title: Multi-Objective Optimal Design of Surface-Mounted Permanent Magnet Motor Using NSGA-II
Abstract: This paper presents a highly structured procedure for multi-objective optimal design of radial surface Permanent-Magnet Synchronous Motor (PMSM). Firstly, a detailed analytical model based on the resolution of Maxwell’s equations using the separation of variables method is presented. From the same model, analytical expressions of four constraint functions dedicated for the optimal design of the PMSM are developed. These constraints are: electromagnetic torque, back electromotive force (back-EMF), flux density saturation in stator/rotor yoke and saturation in stator tooth. Then, the Non-dominated Sorting Genetic Algorithm-II (NSGA-II) is employed to optimize the multi-objective problem formed by two objective functions (weight and power loss of the motor) and different constraints. Finally, the finite element method is used to validate the designed 30 kW PMSM.
Author(s): S. Mendaci, H. Allag, M. R. Mekideche
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 504 KB

Title: On the Properties of Loop-Flower Basis Functions
Abstract: This paper presents a mathematical analysis of loop-flower basis functions which are adopted to cure low frequency breakdown in integral equations for solving electromagnetic scattering problems. Flower basis functions will be analyzed based on RWGconnected graph generated according to RWG basis functions. This paper will also explore the conditioning behavior of loop-flower Gram matrices which greatly contributes to the whole conditioning of electric field integral equation. The performance of loop-flower basis functions is confirmed by numerical results that show fast convergence rate of iteration solvers, which are better than those of loop-star basis functions.
Author(s): Y. Hou, G. Xiao, J. Fang
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 766 KB

Title: A Solution of One-Dimensional Stationary Schrodinger Equation by the Fourier Transform
Abstract: In this paper, a new numerical method for solving of one-dimensional stationary Schrödinger equation has been presented. The method is based on the Fourier transform of a wave equation. It is shown that, as a result we obtain an integral equation where integral is replaced by sum. A main problem is transformed in the eigenvalue/eigenvector problem which corresponds to discrete energy levels as well as the Fourier transform of wave functions. Wave function is obtained by usage of the inverse Fourier transform. Discrete energy levels are split and form the forbidden and permitted zones for the one-dimensional finite crystal. The method is tested in many examples, and it is characterized by high accuracy and stability of search of the discrete energy levels.
Author(s): V. M. Fitio, I. Y. Yaremchuk, V. V. Romakh, Y. V. Bobitski
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 625 KB

Title: Compact Microwave Impedance Matching Using Patterned Conducting Planes
Abstract: ? In this paper, a novel structure for impedance matching in microwave frequency range is introduced. The proposed structure utilizes one or more patterned conducting planes, which are placed transversely in a waveguide. The patterned conducting planes act as frequency selective surfaces for impedance matching purposes. The Green’s function of one or more desired patterned planes, considering coupling effects between them, is obtained. Then magnetic field integral equations, in terms of unknown magnetic currents of patterned planes, are calculated and solved using method of moment. The suitable pattern of a patterned plane is obtained using optimization by genetic algorithm, so that the return loss of whole structure, in the desired frequency range vanishes. The proposed structure, compared with traditional impedance matching structures, is very compact and wideband. It has been shown that its length, in comparison with another compact and wideband microwave impedance matcher, is fifty times shorter. The usefulness of the proposed structure and its performance is verified in some examples, and the response of designed impedance matchers are compared with the results of simulations.
Author(s): A. Ghajar, H. Ghorbaninejad
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 483 KB

Title: Compact and Planar Monopole Antenna for WLAN and WiMAX Applications
Abstract: A novel compact dual-band monopole antenna for WLAN and WiMAX applications is presented. The antenna is fed by a microstrip feed line and consists of two side-by-side split-ring structure as the radiating element. The proposed antenna is compact in size and provides 25.5% and 11.8% dual band performance covering 2.4/5.2 GHz WLAN and 2.5/2.7 GHz WiMAX bands, respectively. Also, the antenna exhibits uniform radiation patterns at each frequency band in both E- and H-planes. Comparison of simulated and measured results of return losses, radiation patterns and gains of the antenna are provided.
Author(s): S. C. Basaran, K. Sertel
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 800 KB

Title: Crosstalk Spectrum Predictions Considering Frequency-Dependent Parameters in Electric Vehicles
Abstract: This paper presents a method which combines impedance measurements, calculations, and equivalent model together to predict crosstalk spectrums. It is simple for calculation and also has good accuracy, because frequency-dependent parameters of both cables and terminal loads are considered. So it has advantages in some complex situations such as electric vehicle (EV). Firstly, a model of single line and twisted-pair wires is established to describe the crosstalk system. In this model, crosstalk voltage expressions are given, and frequency-dependent parameters are obtained from impedance measurements and calculations. Then in order to verify the method, crosstalk spectrums are predicted under conditions of resistance load and frequency-dependent load. Furthermore, predictions and experiments are compared to assess the effectiveness of the method. Based on the predicted and experimental results, frequency domain characteristics of crosstalk are discussed and influence factors are analyzed.
Author(s): Y. Guo, L. Wang, C. Liao
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 1266 KB

Title: Elliptical Slot Antenna with Dual Band-Notched Characteristics for UWB Applications
Abstract: A novel elliptical slot antenna with bandnotched characteristics is presented for ultra-wideband (UWB) applications. The proposed antenna is fed via a microstrip-line that is connected to an elliptically shaped patch. Dual band-notched characteristic is achieved by utilizing an L-shaped strip and an inverted U-shaped slot incorporated within the antenna’s structure. This antenna configuration enables the notch band to be finely tuned by simply adjusting the parameters of notch function components, the L-shaped slot and the inverted Ushaped slot. The antenna with optimal parameters was fabricated on RT/Duroid 6006 that has a thickness of 1.27 mm and a relative permittivity of 6.15. The size of the actual antenna is 50×50 mm2 . The measured VSWR, gain, impedance and radiation characteristics of the proposed antenna confirm it satisfies UWB system requirements.
Author(s): M. Naser-Moghadasi, A. A. Kalteh
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 413 KB

Title: Inspired Metamaterial Quad-Band Printed Inverted-F (IFA) Antenna for USB Applications
Abstract: This paper presents quad-band printed inverted-F antenna that employs transmission-line based on inspired metamaterials for USB applications. The reactive loading of the printed IFA is inspired by transmission-line based metamaterials (TL-MTM), which is exploited to create a new resonant frequency while maintaining the antenna’s small form-factor. The proposed USB antenna structure consists of two arms printed IFA CPW-fed loaded with two TL-MTM unit cells to achieve two operating bands with the same antenna size in addition to the two fundamental resonant frequencies of IFA arms themselves. The structure is designed to operate at LTE 11 0.9 GHz, Bluetooth 2.4 GHz, WIMAX 3.5 GHz, and WLAN 5.2 GHz. The component interaction including housing case, USB connector, and laptop device are also characterized. The design concept, a parametric study of the proposed antenna is carried out using HFSS ver. 14 and CST ver. 2014, and general design guidelines are provided. Experimental results are presented to validate the new design concept. Measurements and EM simulations are in a good agreement.
Author(s): A. M. Soliman, D. M. Elsheakh, E. A. Abdallah, H. M. El-Hennawy
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 725 KB

Title: Optimization of the Auxiliary Sources Method for 2D Arbitrary-Shaped Scattering Problems
Abstract: The distribution of radiation centers plays an important role in the auxiliary sources method. It has a decisive influence on the accuracy of solutions, the convergence rate and the computation cost. The optimal selection of the MAS (method of auxiliary sources) parameters (auxiliary surface, position of radiation centers) is considered an open issue. This work presents a systematic optimization framework to achieve the optimal configuration of the MAS for scattering by an infinite arbitrary-shaped cylinder.
Author(s): A. Bouzidi, T. Aguili
File Type: Journal Paper
Issue:Volume: 30      Number: 5      Year: 2015
Download Link:Click here to download PDF     File Size: 288 KB