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Title: ACES Express Journal March 2018 Cover
File Type: Express Journal Paper
Issue:Volume: 33      Number: 3      Year: 2018
Download Link:Click here to download PDF     File Size: 2168 KB

Title: ACES Express Journal March 2018 Front/Back Matter
File Type: Express Journal Paper
Issue:Volume: 33      Number: 3      Year: 2018
Download Link:Click here to download PDF     File Size: 380 KB

Title: ACES Express Journal January 2018 Full
File Type: Express Journal Paper
Issue:Volume: 33      Number: 3      Year: 2018
Download Link:Click here to download PDF     File Size: 6140 KB

Title: Multi-level Fast Multipole Algorithm for 3-D Homogeneous Dielectric Objects Using MPI-CUDA on GPU Cluster
Abstract: The implementation of Multi-level Fast Multipole Algorithm (MLFMA) on a 13-node Graphical Processing Unit (GPU) cluster using Message Passing Interface (MPI) and CUDA programming is presented. The performance achievements are investigated in terms of accuracy, speed up, and scalability. The experimental results demonstrate that our MLFMA implementation on GPUs is much faster than (up to 66x) that of the CPU implementation without trading off the accuracy.
Author(s): T. Phan, N. Tran, O. Kilic
File Type: Express Journal Paper
Issue:Volume: 33      Number: 3      Year: 2018
Download Link:Click here to download PDF     File Size: 1890 KB

Title: A Substrate Integrated Waveguide Based Antipodal Linear Tapered Slot Antenna for 60 GHz Wireless Communications
Abstract: Antipodal linear tapered slot antenna (ALTSA) for 60 GHz communications is presented in this paper. To obtain a high gain, dielectric loading in addition to the corrugation structure is applied to the ALTSA. The use of substrate integrated waveguide (SIW) technology allows a highly efficient, compact and low cost planar design. The antenna is designed and simulated in an electromagnetic field simulation tool. To validate the proposed design, a prototype has been fabricated and measured. The simulated results agree well with the measured values, which validates the proposed design. The radiation efficiency is observed to be 92%. The antenna has a gain of 18.7 0.5 dBi. The return loss is better than 10 dB over the 60 GHz band (57 GHz 64 GHz).
Author(s): N. Tiwari, T. R. Rao
File Type: Express Journal Paper
Issue:Volume: 33      Number: 3      Year: 2018
Download Link:Click here to download PDF     File Size: 1905 KB

Title: Installed Antenna Performance in Airborne Radomes of Different Profiles
Abstract: In this paper, broadband interactions between an antenna and a radome are modelled using a full wave numerical solver. By accurately describing both the antenna and the radome geometry with a single numerical method, a comprehensive prediction of the performance of the coupled antenna and radome installation is provided. The paper compares how different airborne dielectric radome profiles affect the antenna performance, predicting effects not seen in uncoupled simulations.
Author(s): A. Vukovic, P. Sewell, X. Meng, T. M. Benson
File Type: Express Journal Paper
Issue:Volume: 33      Number: 3      Year: 2018
Download Link:Click here to download PDF     File Size: 1837 KB

Title: A Compact Fractal Monopole Antenna with Defected Ground Structure for Wideband Communication
Abstract: A compact fractal monopole antenna with defected ground structure has been investigated in this paper. A wide bandwidth of 3.13 GHz (3.42 GHz to 6.55 GHz) has been obtained, which covers the IEEE 802.11 WLAN bands (5.2 GHz and 5.8 GHz) and WiMAX bands (3.5 GHz and 5.5 GHz). The dimension of the structure is 14.50 X 27.25 mm2 covering an area of only 395.125 mm2. The realized antenna gain is greater than or equal to 2 dBi at the frequencies of interest. The compactness of the proposed structure and the simplicity of design makes it easy to be fabricated and incorporated in devices suited for wireless communication purpose.
Author(s): A. Bhattacharya, B. Roy, S. K. Chowdhury, A. K. Bhattacharjee
File Type: Express Journal Paper
Issue:Volume: 33      Number: 3      Year: 2018
Download Link:Click here to download PDF     File Size: 1817 KB

Title: Capacitance Extraction for Microstrip Lines Using Conformal Technique Based on Finite-Difference Method
Abstract: In this paper, a novel method using conformal technique of finite-difference method (FDM) is proposed to capacitance extraction of microstrip lines. Instead of deriving the average dielectric constant epsilon, this method uses electric field numerical weights to process the inhomogeneous cells, and takes the discontinuous effects of both inhomogeneous Ampere cell and Faraday cell into account. Besides, a new boundary condition is proposed, where the cells obeying exponential distribution are added at boundary. The new method shows good agreement with the measurement and traditional methods.
Author(s): Y. Sun, X. Wang
File Type: Express Journal Paper
Issue:Volume: 33      Number: 3      Year: 2018
Download Link:Click here to download PDF     File Size: 1872 KB

Title: Ultra-Wideband Microstrip Antenna for Body Centric Communications
Abstract: A novel low profile reconfigurable wide band microstrip antenna for impulse radio ultra-wideband (IRUWB) WBANs and targeted for on-body sensor node has been introduced. The printed monopole antenna consists of a heart shaped radiating patch and an elliptical ground plane. This antenna has a frequency bandwidth of 130% with a VSWR of 1.5 and average gain is about 3.6 dBi. There is a slot on the patch which is loaded by two varactor diodes to form a tunable notch band. The antenna operates from 2.4 GHz to 12 GHz. The proposed antenna is a good candidate for medical purpose since it has a sufficient amount of gain and bandwidth. We used active circuit to increase the flexibility of setting rejection band to prevent having interference from other sources such as Wi-Fi. The antenna is fabricated and there is a good agreement between the simulation and measurement results.
Author(s): A. Darvazehban, T. Rezaee
File Type: Express Journal Paper
Issue:Volume: 33      Number: 3      Year: 2018
Download Link:Click here to download PDF     File Size: 1815 KB

Title: A Simple Analytical Method to Calculate Bending Loss in Dielectric Rectangular Waveguides
Abstract: We present a simple analytical method to compute attenuation in bent dielectric rectangular waveguides. An approximate formulation for the attenuation constant is first derived by determining the ratio of average power loss per unit length to the average power propagating along the waveguide. Since the waveguide has been simplified into a slab in the process of derivation, losses at the four edges of the structure have been neglected. To account for these losses, the perturbation theory has been employed. The total loss is found to agree closely with that obtained via the Finite Element Method (FEM). Unlike the FEM which requires considerable computational time and power to solve, we demonstrate that the analytical method proposed here can easily be applied and it gives sufficiently accurate result.
Author(s): K. H. Yeap, A. W. C. Tan, K. C. Lai, H. Nisar
File Type: Express Journal Paper
Issue:Volume: 33      Number: 3      Year: 2018
Download Link:Click here to download PDF     File Size: 1745 KB

Title: Ultra-Wide Bandwidth Enhancement of Single-Layer Single-Feed Patch Antenna Using the Theory of Characteristic Modes
Abstract: The Theory of Characteristic Modes (TCM) is proposed as a systematic approach to antenna design to achieve the goal of finding the antenna structure with optimum broadband behavior. This theory provides a physical insight to the radiating nature of microstrip patch antennas and reduces the design optimization time. In this work, the resonant behavior of the highly radiating structure of the single U-slot rectangular patch on a single-layer epsilon r = 4.4 substrate is analyzed using TCM. Modal analysis of this single-layer structure with different single feed excitations concludes that VSWR less than or equal to 2 impedance bandwidth in the order of 96% can be achieved with a single T-probe feed. Experimental results, included here, show VSWR less than or equal to 2 impedance bandwidth in the order of 71%.
Author(s): M. M. Elsewe, D. Chatterjee
File Type: Express Journal Paper
Issue:Volume: 33      Number: 3      Year: 2018
Download Link:Click here to download PDF     File Size: 1705 KB