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Title: ACES Journal December 2017 Cover
Abstract: ACES
Author(s):
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
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Title: ACES Journal December 2017 Front/Back Matter
Abstract: ACES
Author(s):
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 304 KB

Title: ACES Journal December 2017 Full
Abstract: ACES
Author(s):
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 7207 KB

Title: Design of a Planar, Concentric Coil for the Generation of a Homogeneous Vertical Magnetic Field Distribution
Abstract: This paper describes an algorithm to design a planar, concentric coil that generates a homogeneous vertical magnetic field distribution, with a target self inductance. The algorithm consists of several steps. The first step is the random generation of a large set of concentric coils, taken into consideration a number of boundary conditions such as the outer dimensions and the radius of the conducting wire. The optimal coil is found from this set after a twofold selection, namely on the self inductance value and on the uniformity of the vertical magnetic field, which was evaluated using a cost function. The algorithm is straightforward and based on closed expressions, which leads to a rapid execution of the procedure. We evaluated the algorithm on a representative reference configuration. The best coil of the large set was selected and the quasi-uniform field distribution of this coil was confirmed by experimental verification.
Author(s): B. Minnaert, L. De Strycker, N. Stevens
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 2136 KB

Title: Mutual Coupling Reduction of Closely Spaced MIMO Antenna Using Frequency Selective Surface based on Metamaterials
Abstract: A new structure for mutual coupling reduction, which is using the application of Frequency Selective Surface (FSS) based on metamaterials is presented in this paper. In this method, first a customdesigned unitcell is presented that provides a proper S12 response for the mutual coupling reduction and then, this unitcell is used in a two-element array of wideband dipoles. According to the results, this unitcell provides a maximum reduction of 15dB in the frequency response of the antenna array, while it does not have a considerable effect on the reflection coefficient and radiation pattern of the antenna. To verify the results, the antenna is fabricated and measured and there is a very good agreement between the simulation and measurement.
Author(s): M. D. Ardakani, R. Amiri
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1892 KB

Title: A Double Modal Parameter Tracking Method To Characteristic Modes Analysis
Abstract: Mode tracking plays an important role in characteristic modes analysis. However, mode tracking in a proper and efficient way is still a challenging work. Based on modal linear correlation and modal stability, a double modal parameter tracking method is proposed in this paper, which is to track modes by correlating eigenvector and calculating the stability of characteristic angle simultaneously. To eliminate ambiguity case of multi-mode mapping one mode, two sorted mode with max Pearson correlation coefficient are identified same mode by utilizing saving best function. In order to verify accuracy and efficiency of the proposed method, four representative structures are analyzed. It can be observed that the proposed tracking method works better than the traditional methods.
Author(s): Q. He, Z. Gong, H. Ke, L. Guan
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1805 KB

Title: Analysis of Transient Scattering from a PEC Coated with Thin Dispersive Dielectric Layer
Abstract: A marching-on-in-time (MOT) based time domain thin dielectric sheet (TDS) method is proposed for analyzing the transient electromagnetic scattering from the perfect electrically conducting (PEC) body coated with thin dispersive material. The sources in the thin dielectric layer are all replaced by the current densities of PEC. A recursive convolution method is utilized to deal with the dispersive properties. The performance of accuracy and stability are investigated numerically.
Author(s): Y. L. Hu, Q. S. Man, D. Z. Ding, R. S. Chen
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1684 KB

Title: RFID Humidity Sensor Tag for Low-cost Applications
Abstract: This article presents a low-cost, flexible, chipless Radio Frequency Identification (RFID) tag for humidity monitoring applications. The tag exhibits moisture sensing feature within a compact geometrical dimension of 20mm x 17.6mm. The design is loaded with 12 resonators, where each resonator represents 1 bit in the frequency domain. For the designed 12-bit tag, 11 inverted C-shaped resonators are dedicated for encoding 11-bit information in their spectral signature. An integrated meandered-shaped resonator, covered with moisture sensitive KaptonŽ HN film, functions as a 1-bit moisture sensor. It is deployed for monitoring relative humidity (RH) levels, simultaneously. The passive RFID tag is realized on Taconic TLX-0 and has an operational bandwidth of 2.62 GHz. Furthermore, the design is modeled and analyzed for multiple substrates. The performance of the sensor tag for various humidity levels indicates that it is a potential solution for inexpensive sensing applications.
Author(s): A. Ali, S. I. Jafri, A. Habib, Y. Amin, H. Tenhunen
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 2011 KB

Title: Modal Analysis of Different Stator Configurations to Mitigate Electromagnetically Excited Audible Noise and Vibrations of Switched Reluctance Motors
Abstract: The primary objective of this paper was to investigate different stator configurations of switched reluctance motors (SRM) in order to mitigate electromagnetically exited audible noise and vibration. We analyzed natural frequencies of different SRM stator configurations by virtue of modal analysis theory. The three-dimensional numerical modeling of SRM stator geometry was performed by using finite element method. Based on the output results, we propose the solutions on how to select an appropriate stator configuration in order to increase its natural frequencies beyond the resonant operational frequency, and thus, to mitigate the resulting audible noise and vibration. The numerical and analytical results are successfully compared to the published data.
Author(s): S. Corovic, R. Benedetic, D. Miljavec
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 2009 KB

Title: Shielding Effectiveness Improvement of Non-Metallic Transparent Enclosures Using Gold Nano-Layer Deposition
Abstract: In this paper we present the results of a simple optically transparent enclosure with efficient electromagnetic shielding. Firstly, Indium Tin Oxide (ITO) enclosures are designed for simultaneously providing high transmittance within a visible range and good shielding effectiveness (SE), where weight reduction, small size, and transparency are challenges. In the next step, gold Nano-layer films of various thicknesses are deposited on the patterned ITO glass using the thermal evaporation method. Then, by making a trade-off between optical transparency and SE, an optimized gold film thickness is selected. To assess the proposed approach, the final experimental results of copper, ITO, and gold deposited enclosures are compared. The results showed that a 9nm gold deposited ITO enclosure, provides efficient electromagnetic shielding better than the ITO enclosure (about 15 dB better at the resonance frequency and much closer to the copper enclosure) and at the same time, acceptable optical transparency.
Author(s): M. Ghiyasvand, M. Naser-Moghadasi, A. A. Lotfi-Neyestank, A. Nikfarjam
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1998 KB

Title: Characterization of 4 Element Compact Microstrip Patch Antenna Array for Efficient Null Steering
Abstract: Null steering in radiation pattern of linear antenna array is essential for minimizing degradation in signal-to-noise ratio performance due to undesired interference. High directivity and miniaturization are other key factors for proficient design of antenna arrays. Thus, the development of small sized antenna elements with high directivity is strategic point of interest. Consequently, the four element bowtie patch antenna array has been designed and simulated using IE3D software, and compared with conventional rectangular patch antenna array. Null steering is performed by varying element excitations in isotropic antenna array, rectangular patch antenna array and bowtie patch antenna array with main emphasis on position and depth of nulls to analyze the radiation characteristics of the designed models. The mutual coupling effects at different inter-element spacings are also presented for both the designed arrays. It has been observed that using bowtie patches as the element in the array brings about comparatively more effective null steering, and enhances the performance of the array as compared to the conventional rectangular patches.
Author(s): B. Kaur, A. Marwaha, S. Rani
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1719 KB