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Title: ACES Journal September 2012
File Type: Journal Paper
Issue:Volume: 27      Number: 9      Year: 2012
Download Link:Click here to download PDF     File Size: 10714 KB

Title: ACES Journal September 2012 Front/Back Matter
File Type: Journal Paper
Issue:Volume: 27      Number: 9      Year: 2012
Download Link:Click here to download PDF     File Size: 630 KB

Title: Matlab-Based Virtual Wedge Scattering Tool for the Comparison of High Frequency Asymptotics and FDTD Method
Abstract: A novel Matlab-based diffraction tool for the investigation of scattered fields around a two-dimensional Perfectly Electric Conductor (PEC) wedge is introduced. Analytical (Exact by Integral, as well as some High Frequency Asymptotic (HFA) techniques) and numerical (Finite-Difference Time-Domain (FDTD)) models are included. The FDTD staircase modeling problems are removed by the application of Dey- Mittra Conformal approach.
Author(s): M. A. Ulsu, L. Sevgi
File Type: Journal Paper
Issue:Volume: 27      Number: 9      Year: 2012
Download Link:Click here to download PDF     File Size: 1856 KB

Title: Numerical Solution of Electromagnetic Integral Equations by the Meshfree Collocation Method
Abstract: This paper presents guidelines for mesh free numerical solution of electromagnetic integral equations. Both static and dynamic problems are considered, including the EFIE and the MPIE for dynamic case. Different choices of the kind of meshfree method, shape functions and their parameters are studied and proper choices are suggested by logical deduction, experience or previous reports. The final configuration is applied to classical problems in one and two dimensions such as electric charge (density) and electric current (density) distributions over a line and flat plates, respectively. The method is validated by convergence analysis and is compared with MoM. In addition, suggestions are made for bypassing numerical integrations that make the construction of the coefficient matrix integration free.
Author(s): B. Honarbakhsh, A. Tavakoli
File Type: Journal Paper
Issue:Volume: 27      Number: 9      Year: 2012
Download Link:Click here to download PDF     File Size: 1208 KB

Title: Micromagnetic Modeling on Magnetisation Dynamics with Lossy Magnetic Material in Thin Film Heads by FDTD Calculations
Abstract: An extension to the standard FDTD formulation aimed at modelling the micromagnetics of materials together with the solution of Maxwell’s equations is presented in this paper. Numerical computations using actual thin film head geometries were carried out with the purpose of validating the method. The analysis of results revealed the importance of the method for modelling electromagnetic interaction with lossy magnetic material in the presence of current and magnetic sources.
Author(s): G. Recio, C. Estebanez
File Type: Journal Paper
Issue:Volume: 27      Number: 9      Year: 2012
Download Link:Click here to download PDF     File Size: 877 KB

Title: GPU implementation of the Modified Equivalent Current Approximation (MECA) method
Abstract: This paper investigates two different methods of implementing the Modified Equivalent Current Approximation (MECA) method using CUDA parallel programing and computing platform [1]. The MECA method allows the analysis of dielectric and lossy geometries and reduces to the well-studied Physical Optics (PO) formulation in case of PEC caterers [2]. We discuss the implementation details and performance of using both an add-on toolbox for MATLAB™ to offload computations to the GPU, as well as porting MECA code to CUDA directly. We show through simulations that both methods are effective at significantly reducing the MECA algorithm computation time.
Author(s): L. E. Tirado, J. A. Martinez-Lorenzo, B. González-Valdés, C. Rappaport, O. Rubiños-López, H. Gómez-Sousa
File Type: Journal Paper
Issue:Volume: 27      Number: 9      Year: 2012
Download Link:Click here to download PDF     File Size: 1735 KB

Title: A Gaussian Modulated Sinusoidal Pulse for Circuit-Parameter Estimation of a Synchronous Generator Using a 2D-FE Field Model
Abstract: This paper presents the parameter estimation of a synchronous generator model based on the Gaussian Modulated Sinusoidal Pulse (GMSP). A 2D Finite Element (FE) model is used to evaluate the proposed signal in the estimation of the equivalent-circuit parameters of the generator. The presented methodology is based on the application of a FE model to simulate a standstill test. The FE model is validated against GMSP experimental results whilst the generator is at standstill. Afterwards, the FE simulation results are used to estimate the equivalent circuit parameters using a genetic algorithm. Finally, the estimated parameters are validated by comparing the simulation results against experimental data of a sudden three-phase short-circuit fault. A synchronous generator of a 7 kVA, 220V, 60 Hz, 1800 rpm, four-pole was employed for validating the estimated model parameters.
Author(s): C. Hernandez, M. Cisneros-González, M. A. Arjona
File Type: Journal Paper
Issue:Volume: 27      Number: 9      Year: 2012
Download Link:Click here to download PDF     File Size: 1426 KB

Title: 2-D DOA Estimation with Matrix Pencil Method in the Presence of Mutual Coupling
Abstract: A new 2-D Direction of Arrival (DOA) estimation algorithm in the presence of mutual coupling for the Uniform Rectangular Array (URA) based on Matrix Pencil (MP) method is presented. By setting a group of elements as auxiliary on each side of the URA, it can accurately estimate the DOAs using a single snapshot of data and the effect of mutual coupling can be eliminated by the inherent mechanism of the proposed method. Theoretical analysis and simulation results demonstrated the effectiveness of the proposed algorithm.
Author(s): A. Azarbar, G. R. Dadashzadeh, H. R. Bakhshi
File Type: Journal Paper
Issue:Volume: 27      Number: 9      Year: 2012
Download Link:Click here to download PDF     File Size: 816 KB

Title: A Novel UWB Filter with WLAN and RFID Stop-Band Rejection Characteristic using Tri-Stage Radial Loaded Stub Resonators
Abstract: The paper presents a novel approach for designing compact ultra-wideband (UWB) band-pass filter with WLAN and RFID stop-band rejection characteristic which is obtained by using tri-stage radial loaded stub resonators. The main advantage of the proposed filter is that the Stopband can perfectly reject the WLAN and RFID (5.2GHz-6.1GHz) signals. The density and the equivalent model of one filter for testing the presented design is given depending on the odd/even excitation resonance condition. The characteristics of the filter are analyzed and discussed. To verify the proposed methods, two filters are designed and fabricated. Measured results show the proposed UWB properties from 3 GHz to 10.8 GHz and stop-band properties from 5.2 GHz to 6.1GHz. The designed filters can be integrated in UWB radio systems and can efficiently enhance the interference immunity from undesired signals such as wireless local area network (WLAN) and RFID.
Author(s): C. Liu, Y. Li, J. Zhang
File Type: Journal Paper
Issue:Volume: 27      Number: 9      Year: 2012
Download Link:Click here to download PDF     File Size: 4077 KB

Title: Enhanced Bandwidth Small Square Monopole Antenna with Band-Notched Functions for UWB Wireless Communications
Abstract: A novel multi-resonance small square monopole antenna with frequency band-notched function is presented. By cutting two modified Cshaped slots in the ground plane bandwidth is increased that provides a wide usable fractional bandwidth of more than 145% (2.85- 17.83). In order to achieve band-rejected function a pair of C-shaped parasitic structures were inserted in the ground plane and a frequency notched band of 5.08–5.93 GHz has been received. The measured results reveal that the bandwidth of the proposed antenna is from 2.85 GHz to 17.83 GHz for VSWR<2. Simulated and experimental results obtained for this antenna show that it exhibits good radiation behavior within the UWB frequency range. The designed antenna has a small size of 12x18 mm2.
Author(s): B. H. Siahkal-Mahalle, M. Ojaroudi, N. Ojaroudi
File Type: Journal Paper
Issue:Volume: 27      Number: 9      Year: 2012
Download Link:Click here to download PDF     File Size: 1318 KB

Title: Compact Microstrip Branch-line Coupler with Wideband Harmonic Suppression
Abstract: one compact microstrip branch-line coupler with wideband harmonic suppression is presented in this letter. The new structure has two significant advantages, which not only effectively reduces the occupied area to 26.5% of the conventional branch-line coupler at 0.96 GHz, but also has high 6th harmonic suppression performance. The measured results indicate that a bandwidth of more than 120 MHz has been achieved while the phase difference between S21 and S31 is within 90° ± 1°. The measured bandwidth of |S21| and |S31| within 3 ± 0.5 dB are 145 MHz and 150MHz, respectively. Furthermore, the measured insertion loss is comparable to that of a conventional branch-line coupler. The new coupler can be easily implemented by using the standard printed-circuit-board etching processes and is very useful for wireless communication systems.
Author(s): H. Cui, J. Wang, J. L. Li
File Type: Journal Paper
Issue:Volume: 27      Number: 9      Year: 2012
Download Link:Click here to download PDF     File Size: 1180 KB

Title: Small Slot Antenna with Enhanced Bandwidth and Band-Notched Performance for UWB Applications
Abstract: A novel ultra wideband (UWB) printed slot antenna with band-notched performance is designed and manufactured. In order to increase the impedance bandwidth of the slot antenna, we use a rectangular slot with a pair of L-shaped strips protruded inside the slot on the ground plane that with this structure UWB frequency range can be achieved. Additionally, by using an N-shaped slot on the radiating stub, a frequency notch band performance has been obtained. The designed antenna has a small size of 20×20 mm2 while showing the radiation performance in the frequency band of 3.12 to over 14.27 GHz with a band rejection performance in the frequency band of 5.03 to 5.86 GHz. Simulated and experimental results obtained for this antenna show that it exhibits good radiation behavior within the UWB frequency range.
Author(s): M. T. Partovi, N. Ojaroudi, M. Ojaroudi
File Type: Journal Paper
Issue:Volume: 27      Number: 9      Year: 2012
Download Link:Click here to download PDF     File Size: 1248 KB