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Title: ACES January 2012 Full Journal
File Type: Journal Paper
Issue:Volume: 27      Number: 1      Year: 2012
Download Link:Click here to download PDF     File Size: 5452 KB

Title: ACES January 2012 Front/Back Matter
File Type: Journal Paper
Issue:Volume: 27      Number: 1      Year: 2012
Download Link:Click here to download PDF     File Size: 627 KB

Title: Enhanced Parallel FDTD Method Using SSE Instruction Sets
Abstract: To accelerate the simulation of the parallel FDTD method, this paper proposes an effective hardware acceleration technique based on the SSE instruction sets, and puts forward a three-level data parallel algorithm based on MPI, OpenMP and SSE instructions. To demonstrate the acceleration effect of this technique, this paper develops two types of codes using C language: one is based on MPI + OpenMP, another is based on MPI + OpenMP + SSE, and then draws a comparison between the computing time of the two types of codes in the numerical experiments for the same electromagnetic radiation problems. The experimental results show that this acceleration technique can achieve an acceleration rate of 2.44 for the ideal case on a PC cluster and 2.37 for the practical problem on a 2-CPU workstation without requiring any extra hardware investment, and provide an efficient and economical technique for the electromagnetic simulations.
Author(s): L. Zhang, X. Yang, W. Yu
File Type: Journal Paper
Issue:Volume: 27      Number: 1      Year: 2012
Download Link:Click here to download PDF     File Size: 676 KB

Title: Meshless Radial Basis Functions Method for Solving Hallenís Integral Equation
Abstract: This paper introduced a meshless method based on radial basis function (RBF) interpolation to solve Hallenís integral equation (HIE) of the thin wire. The unknown current Iz(z) is interpolated by RBF at the center nodes and point matching method is applied to HIE at the collocation nodes. To validate the present method, the input impedance and induced current of dipole antenna are computed with the r5-RBF and Wuís RBF, respectively. The results show that the present method is a steady numerical approach for solving HIE.
Author(s): S. J. Lai, B. Z. Wang , Y. Duan
File Type: Journal Paper
Issue:Volume: 27      Number: 1      Year: 2012
Download Link:Click here to download PDF     File Size: 375 KB

Title: Two-Step Preconditioner of Multilevel Simple Sparse Method for Electromagnetic Scattering Problems
Abstract: In order to efficiently solve the dense complex linear systems arising from electric field integral equations (EFIE) formulation of electromagnetic scattering problems, the multilevel simple sparse method (MLSSM) is used to accelerate the matrix-vector product operations. Because of the nature of EFIE, the resulting linear systems from EFIE formulation are challenging to solve by iterative methods. In this paper, the twostep preconditioner is used to alleviate the low convergence of Krylov subspace solvers, which combine the modified complex shifted preconditioner and sparse approximate inversion (SAI) preconditioner. Numerical examples demonstrate that the two-step preconditioner can greatly improve the convergence of the generalized minimal residual method (GMRES) for the dense complex linear systems and reduce the computationnal time significantly.
Author(s): X. Hu, R. Chen, D. Ding, Z. Fan, Y. Xu
File Type: Journal Paper
Issue:Volume: 27      Number: 1      Year: 2012
Download Link:Click here to download PDF     File Size: 407 KB

Title: A Methodology to Identify Crosstalk Contributor from 6-Line Suspension Assembly Interconnect of Ultra-High Capacity Hard Disk Drives
Abstract: The crosstalk phenomenon on the suspension assembly interconnecting trace (SAIT) in hard disk drives (HDD) causes the signal to deform and/or degrade the recording head. For the purpose of analyzing the crosstalk contributions from SAIT using the 3D electromagnetic simulation tool, SAIT is divided into 4 sections which are bend section (BS), far-end section (FS), straight section (SS), and near-end section (NS). The length of each section is selected based on the physical shape of the trace and characteristic impedance. From the results, it was observed that the lowest crosstalk occurs at the BS and the highest crosstalk occurs at the NS. NS is necessary during a HDD quality evaluation and is removed before the SAIT installed in the HDD. With such high crosstalk, the test results can indicate poor head performance even when the head is working properly. Moreover, the crosstalk can be suppressed up to 14 dB and 33 dB for the near-end side and the far-end side, respectively when the NS with a 100% filled stainless steel backing layer is applied to the SAIT. Hence, to improve the accuracy of the recording head test performance, the designer should put more effort to design the SAIT near-end section to minimize crosstalk.
Author(s): K. Prachumrasee, A. Siritaratiwat, V. Ungvichian, R. Sivaratana, A. Kaewrawang
File Type: Journal Paper
Issue:Volume: 27      Number: 1      Year: 2012
Download Link:Click here to download PDF     File Size: 440 KB

Title: Capacitance Value Control for Metamaterial Reflectarray using Multi-layer Mushroom Structure with Parasitic Patches
Abstract: A mushroom-structure reflectarray can be designed by setting the values of inductance L and capacitance C based on LC resonant circuit theory. Since the capacitance value is determined by the gap size of mushroom patches and the range of the gap size is limited by the manufacturing process, it is difficult to adjust the capacitance value to achieve the desired reflection phase for the reflectarray design. To address this issue, this paper proposes introducing multi-layer parasitic patches on the mushroom structure and controlling the capacitance values using the number of parasitic layers based on the parallel resonant circuit theory. This paper also proposes a novel design method for mushroom reflectarrays when the incident electric field and beam control direction of the scattered waves are set parallel by focusing on the capacitance value. We measure reflected and scattered waves in an anechoic chamber. The measurement results of the direction of the reflected wave are shown compared to the results of the theoretical and simulation analyses.
Author(s): T. Maruyama, T. Furuno, Y. Oda, J. Shen, T. Ohya
File Type: Journal Paper
Issue:Volume: 27      Number: 1      Year: 2012
Download Link:Click here to download PDF     File Size: 929 KB

Title: 8◊8 Near-Field Focused Circularly Polarized Cylindrical DRA Array for RFID Applications
Abstract: The design of an 8◊8 near-field focused circularly polarized dielectric resonator antenna (DRA) array for fixed RFID reader applications at 5.8 GHz is presented. The proposed antenna array consists of 64-element of cylindrical dielectric resonator antennas (CDRA) with two orthogonal feeding probes located inside the CDRA element. A single element CDRA with supporting arms is used as a building block of the array provided good impedance matching and circular polarization at 5.8 GHz. The perforation technique is used for the supporting arms to reduce the manufacturing complexities in the CDRA mounting over the ground plane. The sequential feeding technique is applied to improve the gain and circular polarization bandwidth of the single element and the array. The characteristics of the near-field focused array are introduced compared to that of the uniformly phased array. The finite integral technique and the finite element method are used to compute the array performance.
Author(s): S. H. Zainud-Deen, H. A. Malhat, K. H. Awadalla
File Type: Journal Paper
Issue:Volume: 27      Number: 1      Year: 2012
Download Link:Click here to download PDF     File Size: 858 KB

Title: Design of N-Channel Rotary Joint using Curved Double-Ridged Waveguide and Concentric Coaxial Lines
Abstract: In this paper, a general design method for a special kind of N-channel rotary joint is presented. The N-channel configuration is achieved by using transition between concentric coaxial lines and double-ridged waveguides. Design of double-ridged waveguides for the purposed transition is also presented. Based on this method, an ultra wide band six-channel rotary joint is designed for a frequency band of 8 to 18 GHz. A full-wave numerical simulation tool is used to optimize the geometry of the proposed sixchannel rotary joint to achieve a compact size, wide bandwidth operation, and low insertion loss. Simulated results show the insertion loss of less than 0.5 dB and VSWR ? 2 for all channels over the entire frequency bandwidth. Finally, the sensitivity analysis is done to obtain the effect of the manufacturing tolerances on performances of the rotary joint.
Author(s): A. Mallahzadeh, H. Ahmadabadi
File Type: Journal Paper
Issue:Volume: 27      Number: 1      Year: 2012
Download Link:Click here to download PDF     File Size: 998 KB

Title: An AMC Based Antenna for Telemedicine Applications
Abstract: In this paper, we present an antenna design for telemedicine applications operating in the Industrial Scientific Medical (ISM) 2.4 GHz band. The design is based on a printed monopole antenna integrated with an artificial magnetic conductor (AMC) ground plane. The AMC ground plane is utilized to isolate the userís body from undesired electromagnetic radiation in addition to eliminating the antennaís impedance mismatch caused by the proximity to human tissues. Moreover, specific absorption rate (SAR) is analyzed based on a numerical human body model (HUGO) to assess the design feasibility. Results show that the radiation characteristics, impedance matching, and SAR values of the proposed design are significantly improved compared with conventional antennas.
Author(s): H. R. Khaleel, H. M. Al-Rizzo, D. G. Rucker
File Type: Journal Paper
Issue:Volume: 27      Number: 1      Year: 2012
Download Link:Click here to download PDF     File Size: 551 KB

Title: A Novel Integrated Corrugated Waveguide Bandpass Filter
Abstract: This paper presents the approach for the design of a X-band bandpass filter using substrate integrated corrugated waveguide (SICW). The SICW filter which is proposed in this paper, is totally realized in a single-layer dielectric substrate with two sequences of metallic vias with the different diameters, and fabricated using a standard PCB process. This proposed filter has the same dispersion characteristics as a waveguide filter, while its dimensions are very shorter than it. A transition circuit between the SICW and 50 ? microstrip lines was designed for excitation of the filter.
Author(s): H. Aghayari, N. Komjani, N. M. Garmjani
File Type: Journal Paper
Issue:Volume: 27      Number: 1      Year: 2012
Download Link:Click here to download PDF     File Size: 640 KB

Title: A Novel SWB Small Rhombic Microstrip Antenna with Parasitic Rectangle into Slot of the Feed Line
Abstract: In this letter, a rhombic monopole antenna with a parasitic rectangle into slot of the feed line is proposed to broaden impedance bandwidth. The antenna has a compact size with 19 ◊ 16mm2 which has been printed on a FR4 substrate with thickness of 1mm. The measurements show that the antenna has reflection coefficient better than -10dB from 2.9 up to 29GHz. Meanwhile, the measured patterns and gain are presented later in the paper.
Author(s): M. Mighani, M. Akbari, N. Felegari
File Type: Journal Paper
Issue:Volume: 27      Number: 1      Year: 2012
Download Link:Click here to download PDF     File Size: 622 KB