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Title: ACES Journal April 2015 Cover
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
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Title: ACES Journal April 2015 Front/Back Matter
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
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Title: ACES Journal April 2015 Full
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
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Title: Coulombian Model for 3D Analytical Calculation of the Torque Exerted on Cuboidal Permanent Magnets with Arbitrary Oriented Polarizations
Abstract: This paper proposes improved analytical expressions of the torque on cuboidal permanent magnets. Expressions are valid for any relative magnet position and for any polarization direction. The analytical calculation is made by replacing polarizations by distributions of magnetic charges on the magnet poles (coulombian approach). The torque exerted on the second magnet is calculated by Lorentz force formulas for any arbitrary position. The three components of the torque are written with functions based on logarithm and arc-tangent. Results have been verified and validated by comparison with finiteelement calculation. Further, the torque can be obtained with respect to any reference point. Although these equations seem rather complicated, they enable an extremely fast and accurate calculation of the torque exerted between two permanent magnets.
Author(s): H. Allag, J.-P. Yonnet, H. R. E. H. Bouchekara, M. E. H. Latreche, C. Rubeck
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
Download Link:Click here to download PDF     File Size: 273 KB

Title: Design of Wide Stopband Narrow-Band BPFs Exhibiting Harmonic Suppression
Abstract: This paper presents narrow-band bandpass filters with wide stopband for WLAN and WiMAX systems.
Author(s): Sh. Amiri, N. Khajavi, M. Khajavi
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
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Title: Novel Phase Shifter Based on Dielectric Resonator on Liquid Crystal Substrate
Abstract: In this paper, a novel design of microwave phase shifter with enhanced high level of flexible integration is proposed and analyzed using 3D finite difference time domain. The proposed design is based on the combination of dielectric resonators and nematic liquid crystal (NLC) layer of type E7. The effects of the structure geometrical parameters on the transmission angle are carried out. Based on the simulation results, optimizations of the geometries are curial for varying the phase of the transmitted signal. In addition, the use of NLC layers placed in silica pan as a substrate to the dielectric resonator offers a number of advantages over existing microwave phase shifters such as simple design, high bandwidth and phase tunability. Moreover, the suggested design has an excellent potential for being very useful in microwave encryption systems.
Author(s): S. A. Attya, N. F. F. Areed, M. F. O. Hameed, M. A. El-Razzak, S. S. A. Obayya
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
Download Link:Click here to download PDF     File Size: 958 KB

Title: A Compact UWB Printed Monopole Antenna with Triple-Band Notched Characteristics
Abstract: A compact triple band-notched printed monopole antenna for ultra-wideband (UWB) application is presented. By inserting two triangular-shaped notches in both sides of the ground plane of microstrip feed line, additional resonances are excited and the bandwidth is increased up to 160%. Three sharp notched frequency bands at 3.8 GHz, 5.5 GHz, and 7.5 GHz are achieved by embedding a pair of rectangularshaped slits in the ground plane and two pairs of modified bow-shaped slits in the patch. This novel monopole antenna has ultra-wide frequency bandwidth for input impedance, compact size (24 mm 20 mm), low cost fabrication and Omnidirectional H-plane radiation pattern which makes it suitable for ultra-wideband applications. The measured results reveal that the presented triple band-notched monopole antenna is a promising candidate for UWB communication systems to avoid interference with WiMax band (3.3-3.7 GHz), some C-band (3.7-4.2 GHz), WLAN (5.15- 5.825 GHz) bands and some C-band satellite communication systems (7-8 GHz).
Author(s): A. Abdollahvand, A. Pirhadi, M. R. Hosseinnezhad, H. Ebrahimian
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
Download Link:Click here to download PDF     File Size: 2540 KB

Title: Polarization Angle Independent Metamaterial Absorber in both of C- and X-Bands
Abstract: In this study, perfect metamaterial absorbers (MAs) based on circle- and squareshaped configurations that are numerically and experimentally designed and analyzed in both of Cand X-band. The proposed models have very simple designs and present perfect absorption for all polarization angles. A sensor application of the suggested model (for circle-shaped) is also presented to introduce further feature of the structure. Moreover, the suggested models can be easily reconfigured for THz and infrared frequency regimes to enable myriad potential applications such as sensors, defense systems and stealth in the next studies.
Author(s): M. Karaaslan, A. O. Demirci
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
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Title: Optimization of Frequency Selective Surface with Simple Configuration Based on Comprehensive Formation Method
Abstract: A new approach to design a frequency selective surface (FSS) is presented based on optimizing the shape of its unit cell geometry. A method based on spline concept has been adopted to specify geometrical features of the elements. In the design process, a hybrid optimization process including genetic algorithm and pattern search method has been used for this purpose. The shape of the structure is improved in each iteration based on specific fitness function. The commercial software CST is used for accurate analysis of structures along the optimization process. A VBA code is developed in order to link Matlab code, which includes optimization tools, and analyzer software CST. This method is used to develop band-pass and band-stop FSSs. Our simulated results show that the transmission and reflection characteristics of the designed FSS are very good in specified frequency band.
Author(s): N. F. Amini, M. Karimipour, K. Paran, S. Chamani
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
Download Link:Click here to download PDF     File Size: 406 KB

Title: Rotor Configuration for Cogging Torque Minimization of the Open-Slot Structured Axial Flux Permanent Magnet Synchronous Motors
Abstract: In this study, the rotor structure of the double rotor single stator axial flux permanent magnet synchronous motor (AFPM) is optimized for minimizing the cogging torque without significantly changing the average torque of the motor. Three-dimensional (3-D) finite element analysis (FEA) is used for this optimization. Obtained results are compared with a base line reference axial flux synchronous motor.
Author(s): E. Aycicek, N. Bekiroglu, I. Senol, Y. Oner
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
Download Link:Click here to download PDF     File Size: 3284 KB

Title: Extended Bandwidth Monopole Antenna with Frequency Band-Stop Operation for Wireless Applications
Abstract: This letter proposes a new monopole antenna for wireless applications, in particular ultra wideband (UWB) with 3.5/5.5 GHz dual notched bands. The antenna includes square patch, 50 ? microstrip feed-line, and a partial ground plane using a new structure provides a broad impedance bandwidth. In order to achieve dual notched bands at 3.5 GHz and 5.5 GHz, two radiating strips and a T-shaped slot on the radiating patch are applied, respectively. The antenna is simple in geometry and has a small size of 1914 mm2 . The measured results show a desirable agreement with the simulated results. The antenna approximately produces omnidirectional radiation patterns in Hplane, and flat gain over the whole UWB frequency excluding the two notched bands (WiMAX and WLAN bands).
Author(s): M. Akbari, N. Rojhani, M. Saberi, S. Zarbakhsh, A. Sebak
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
Download Link:Click here to download PDF     File Size: 793 KB

Title: The Parallel Ray Propagation Fast Multipole Algorithm with Curve Asymptotic Phase Basis Function for Large-Scale EM Scatterings
Abstract: The curve asymptotic phase basis functions (AP-CRWG) are introduced to reduce the number of unknowns. Moreover, the parallel raypropagation fast multipole algorithm (RPFMA) is used to accelerate the far-interaction calculation. The translation between any two groups in the multilevel fast multipole algorithm (MLFMA) is expensive and the translator is defined on an Ewald sphere with many k directions. When two groups are well separated, the translation can be simplified by using RPFMA, where only a few sampling k directions are required within a cone zone on the Ewald sphere. As a result, both the memory requirement and the CPU time can be saved significantly. Numerical examples are given to demonstrate that the proposed method is more efficient than both the conventional MLFMA and the RPFMA-MLFMA.
Author(s): Z. H. Fan, Z. He, D. Z. Ding, R. S. Chen
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
Download Link:Click here to download PDF     File Size: 622 KB

Title: Compact Band-Stop Filter for X-Band Transceiver in Radar Applications
Abstract: In this paper, we introduce a compact microstrip band-stop filter (BSF) at X-band communication and this shall be used in local oscillator chain for X-band transceiver due to its simple structure, compact size, and excellent performance. Presented microstrip filter consists of a transmission line with a square ring stub and four arrow-shaped strips protruded inside the ring, and a ground plane. Operation frequencies of the filter can be easily controlled by changing four protruded arrow-shaped strips in the square-ring stub. The proposed band-stop filter has wide bandwidth from 8 to 12 GHz for X-band communication that can be used in radar applications. Experimental results show good agreement between simulation results and measurements that excellent stop-band performance could be obtained through the proposed band-stop filter. The proposed microstrip filter is fabricated on a Rogers RT/Duroid 5880 substrate with a relative dielectric constant of 2.2 and has a very small size of 1015 mm2 .
Author(s): M. Pourbagher, N. Ojaroudi, C. Ghobadi, J. Nourinia
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
Download Link:Click here to download PDF     File Size: 1197 KB

Title: Implementation of Two Different Moving Window FDTD Methods to Simulate the Electromagnetic Propagation in Tunnel with Parallel Computing
Abstract: Tunnel engineering is electrically large compared with the GHz electromagnetic pulse (EMP), it is difficult to simulate the EMP propagation in large-scale and long-distances vaulted tunnel by using the conventional finite-difference time-domain (FDTD) method.
Author(s): Y.-F. Mao, J.-H. Chen, L. Pan, X.-M. Wang
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
Download Link:Click here to download PDF     File Size: 815 KB

Title: Modified Ground Circle Like-Slot Antenna with Dual Band-Notched Characteristics for Super UWB Applications
Abstract: In this paper, a compact modified ground slot antenna is proposed. This antenna is designed for super ultra-wideband (UWB) applications. To reduce the interference effect on the WLAN and WiMAX systems, it comes up with dual band notched characteristics. In the antenna geometry, a pair of L-shaped stubs connected to the fork-shaped patch is employed to introduce single band-notched characteristics in 5.15-5.825 GHz for WLAN system. This feature also causes that the middle frequency of the band is highly improved. Moreover, a T-shaped stub is added to the center of the fork-shaped patch to generate the frequency band stop performance in 3.3-3.8 GHz for WiMAX system. Furthermore, we propose a modified ground plane including a pair of inverted T-shaped slits, cut from the ground plane, to improve the bandwidth to 164%. The simulation and measurement results indicate a very wide impedance bandwidth from 2.5 up to 23 GHz, with pre-designed dual band notched properties, for the proposed antenna. This slot antenna with abovementioned frequency bandwidth has a compact size of 24?25 mm2 , and therefore is suitable for many UWB applications.
Author(s): S. R. Emadian, J. Ahmadi-Shokouh
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
Download Link:Click here to download PDF     File Size: 2527 KB

Title: Numerical Analysis and Design of a New Simple Compact Ultra-Wideband Dielectric Resonator Antenna with Enhanced Bandwidth and Improved Radiation Pattern
Abstract: A new simple compact ultra-wideband (UWB) dielectric resonator antenna (DRA) is presented. The finite-difference time-domain (FDTD) method is used to the full-wave analysis of this structure. The antenna consists of a modified stepped microstrip fed monopole printed antenna loaded with a rectangular dielectric resonator, truncated ground plane and a parasitic strip underneath the dielectric resonator (DR). By using an optimized truncated ground plane and a combination of stepped feed line with dielectric resonator, an ultra-wide impedance bandwidth of 153% for (S11 ? -10 dB), covering the frequency range of (3.728 GHz) is achieved. The added parasitic strip can improve the radiation pattern, especially at high frequencies. The proposed antenna covers almost the entire UWB (3.110.6 GHz), Ku (12.418 GHz) and K (1826.6 GHz) frequency bands. Also, this antenna has an omnidirectional and stable radiation pattern over the whole operating frequency range and a compact size of (15205.8 mm3 ) that make it suitable for wideband wireless system applications. This structure is light weight and can be easily fabricated. A prototype is built and measured. The simulated and measured results are in good agreement with the computed FDTD result.
Author(s): S. H. Seyyedhatami, R. A. Sadeghzadeh
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
Download Link:Click here to download PDF     File Size: 1763 KB

Title: An Exact Solution for the Generalized Spherical Orthogonality Integral of the Legendre Functions of the First and Second Kind
Abstract: An exact formulation of a generalized orthogonality integral for the spherical boundary condition is proposed. This integral usually appears in the problems contained in conical and biconical antennas. The analytical results are successfully validated through a comparison with the numerical results.
Author(s): A. Jafargholi
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
Download Link:Click here to download PDF     File Size: 367 KB

Title: Compact Planar Microstrip-Fed Printed Antenna with Double Band-Filtering for UWB Application
Abstract: In this paper, a new design of dual bandnotch printed monopole antenna for UWB applications is proposed. The antenna consists of a circular disc radiating patch with a protruded anchor-shaped strip, a feed line with an inverted Uring slot and a ground plane structure, which provides a wide usable fractional bandwidth of more than 125% (2.69-12.53 GHz) with dual bandstop performance around of 3.3-4.2 GHz and 5-6 GHz. In the proposed structure, by using a protruded anchor-shaped strip in the radiating patch, a single frequency band-stop performance can be achieved. Also, in order to create the second notched frequency, an inverted U-ring slot was cut at the feed line. Simulated and measured results obtained for this antenna show that the proposed monopole antenna offers two notched bands, covering all the 5.2/5.8 GHz WLAN, 3.5/5.5 GHz WiMAX and 4-GHz C-band range. The proposed antenna has a small dimension of 12181.6 mm3 .
Author(s): S. Ojaroudi, Y. Ojaroudi, N. Ojaroudi
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
Download Link:Click here to download PDF     File Size: 1244 KB

Title: Ultra-Wideband Antenna with Variable Notch Band Function by Defected Ground Structure and Shorting Pin
Abstract: In this paper, a simple miniaturized printed antenna for ultra-wideband applications with variable band-notch function is proposed. The presented antenna consists of a square radiating patch and a ground plane with inverted T-shaped slot which increases the bandwidth of 2.311 GHz. Frequency band-stop performance is created by two techniques: Defected Ground Structure (DGS) and shorting pins. The designed antenna has a small size of 17211 mm3 while showing the band rejection performance in the frequency bands of 3.2 to 3.8 and 5.1 to 5.85 GHz, respectively
Author(s): M. Akbari, S. Zarbakhsh, R. Movahedinia, A. Sebak
File Type: Journal Paper
Issue:Volume: 30      Number: 4      Year: 2015
Download Link:Click here to download PDF     File Size: 803 KB