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Title: ACES Journal May 2014 Cover
File Type: Journal Paper
Issue:Volume: 29      Number: 5      Year: 2014
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Title: ACES Journal May 2014 Front/Back Matter
File Type: Journal Paper
Issue:Volume: 29      Number: 5      Year: 2014
Download Link:Click here to download PDF     File Size: 23 KB

Title: ACES Journal May 2014 Full
File Type: Journal Paper
Issue:Volume: 29      Number: 5      Year: 2014
Download Link:Click here to download PDF     File Size: 11386 KB

Title: Price-Performance Aspects of Accelerating the FDTD Method Using the Vector Processing Programming Paradigm on GPU and Multi-Core Clusters
Abstract: The parallelization of the FDTD on GPUs has become popular due to the low cost, low power and high compute performance achieved with these devices. In recent years, manufacturers of multi-core processors have enhanced the vector processing capability inherent in conventional processing cores, to the extent that these are now contributing considerably to the acceleration of the FDTD and competing with GPUs. This paper will compare the power consumption and purchase cost versus the performance benefits of several parallel FDTD implementations, in order to quantify the effect of parallelizing the FDTD using various processing paradigms. The purchase cost of hardware, computational performance and power consumption are used to compare the parallel FDTD deployments on the BlueGene/P, GPU clusters and the multi-core clusters using SSE. It is shown that the deployment of the parallel FDTD using a hybrid programming paradigm achieves the best computational performance for the lowest purchase cost and power consumption
Author(s): R. G. Ilgner, D. B. Davidson
File Type: Journal Paper
Issue:Volume: 29      Number: 5      Year: 2014
Download Link:Click here to download PDF     File Size: 653 KB

Title: Radiation from Slotted Cylinder Embedded in Cylindrical Capped Corner Reflector
Abstract: An integral equation is formulated for the current distribution on slotted cylinder placed in a cylindrical capped corner reflector. The moment method is used to obtain the current distribution on the antenna conducting surfaces. The radiation pattern of the antenna is then calculated for different corner angles. Interesting results are obtained for different corner angle. The advantage of this geometry over the traditional corner reflector antenna is that it can be part of a ship or aircraft, in which the slotted cylinder is embedded in a conducting corner.
Author(s): H. A. Ragheb, E. E. Hassan
File Type: Journal Paper
Issue:Volume: 29      Number: 5      Year: 2014
Download Link:Click here to download PDF     File Size: 729 KB

Title: Direct Antenna Modulation (DAM) with Switched Patch Antenna Performance Analysis
Abstract: Resonant antennas, such as patch antennas, can be directly modulated with high speed switch devices that were integrated onto the radiation aperture, as the radiation can be turned on or shut off in real-time. Such an antenna is found to be able to radiate pulses with rich spectrum components far beyond the antenna's originally defined bandwidth. In this paper, the efficiency bandwidth product of such an antenna is examined to determine whether it can potentially surpass the usual limit defined by the antenna quality factor. For this purpose, a thorough study on the time-varying behavior of a directly modulated microstrip patch antenna is carried out. The theoretical performance of such an antenna in its radiation power and efficiency is discussed. The time-domain analysis starts with the transmission line model of the patch antenna and the equivalent circuit models. A full-wave Finite Difference Time Domain (FDTD) code that incorparates time-varying switching devices in its mesh is then used to simulate the dynamics of the antenna. The study has demonstrated the capability of improving the radiation efficiency and bandwidth performance over the convential 1/Q limit, with the so-called Direct Antenna Modulation (DAM) technique.
Author(s): H. C. Jing, X. J. Xu, Y. E. Wang
File Type: Journal Paper
Issue:Volume: 29      Number: 5      Year: 2014
Download Link:Click here to download PDF     File Size: 733 KB

Title: A Reconfigurable Square Slot Antenna with Switchable Single Band, UWB and UWB with Band Notch Function Performances
Abstract: In this paper a novel method for designing a square slot antenna with switchable single band, multi-resonance (Ultra-Wideband (UWB)) and UWB with band-notch function performances has been presented. By inserting a pair of symmetrical notches on the feed-line and a pair of gamma-shaped slots on the radiating stub, additional resonances are excited and hence much wider impedance bandwidth is produced; especially at the higher band. In order to generate a reconfigurable band-notch function, a PIN diode is utilized across the microstrip stub between the two gamma-shaped slots. Also, through implementation of two H-shaped slots on the ground plane, not only the coupling at lower and middle frequencies is adjusted, but also by embedding a PIN diode between these two Hshaped slots, an additional reconfigurable functionality is added to the antenna performances; which can switch between a single band and multi-resonance (UWB) characteristics. The designed antenna has a small size of 2020 mm 2 while simulated and experimental results obtained for this antenna reveal that it exhibits good radiation behavior for its various switchable operation frequencies.
Author(s): B. Badamchi, A. Valizade, P. Rezaei, Z. Badamchi
File Type: Journal Paper
Issue:Volume: 29      Number: 5      Year: 2014
Download Link:Click here to download PDF     File Size: 2127 KB

Title: Application of SVM and BCG-FFT Method for the Parameter Reconstruction of Composite Conducting-Dielectric Cylinder
Abstract: In this paper, Support Vector Machine (SVM) technique is used to reconstruct the geometric and dielectric characteristics of composite conducting-dielectric cylinder. To this aim, the scattered electric fields at a number of observation points by composite conductingdielectric object under the different object parameters are calculated by stabilized Biconjugate Gradient Fast Fourier Transform method (BCG-FFT) and provide to SVM as input training samples, while the output of the SVM are the characteristics of the objects. In numerical results, the proposed technique is applied successfully to the reconstruction of the geometric and dielectric parameters of composite conducting-dielectric cylinder. The effectiveness of the SVM method is evaluated and also in comparison with the Neural Network (NN) based approaches.
Author(s): Q. H. Zhang, H. T. Chen
File Type: Journal Paper
Issue:Volume: 29      Number: 5      Year: 2014
Download Link:Click here to download PDF     File Size: 1315 KB

Title: A Miniaturized Omni-directional Negative Permittivity Zeroth-Order Resonance Antenna
Abstract: An Evolved Negative permittivity (ENG) Zeroth-Order Resonance (ZOR) antenna with miniaturized size and ultra-low profile is presented in this paper. By adding parasitic patch and loading meander line in steps, the antenna ZOR operational frequency is decreased from 5.084 GHz to 177.8685 MHz, while keeping the overall dimensions unchanged; which is equivalent to about twenty-eight times electrical size reduction based on the equivalent circuit models. Moreover, the proposed miniaturized antenna with omni-directional radiation performance is promising for the specific lowpower radio applications, such as short range remote control system and household security system.
Author(s): M.-C. Tang, T. Deng, H. Xiong, S. Qing, H. Zeng
File Type: Journal Paper
Issue:Volume: 29      Number: 5      Year: 2014
Download Link:Click here to download PDF     File Size: 1342 KB

Title: Microstrip Low-Pass Filter with Sharp Roll-Off Using Transformed Radial Stubs
Abstract: A novel microstrip low-pass filter with good characteristics, such as sharp roll-off, wide stop-band, low insertion loss and good return loss is presented. The proposed filter with a 3 dB cut off frequency at 1.19 GHz, roll-off rate equal to 218 dB/GHz and a relative stop-band bandwidth of 163.5% (referred to a suppression level of -20 dB) is designed, fabricated and measured, achieving a highest figure of meritequal to 77228. There is good agreement between the simulation and measurement results.
Author(s): M. Hayati, H. Shahbazitabar, G. Hajian
File Type: Journal Paper
Issue:Volume: 29      Number: 5      Year: 2014
Download Link:Click here to download PDF     File Size: 979 KB

Title: A Novel Compact Microstrip Low-pass Filter with a Wide Rejection-Band and Sharp Roll-Off using Star-Shaped Resonator
Abstract: In this paper, a novel compact microstrip Low-Pass Filter (LPF) with a wide rejection-band and sharp roll-off using a starshaped resonator is presented. The proposed LPF provides some significant features, such as simple structure, low insertion-loss less than 0.1 dB from DC to 2.391 GHz in the pass-band and expanded stop-band with an attenuation level better than -20 dB from 2.842 GHz up to 20.65 GHz. The transition band is 0.27 GHz from 2.57 GHz to 2.84 GHz, with corresponding attenuation levels of -3 dB and -20 dB, respectively. The filter with a -3 dB cutoff frequency of 2.57 GHz has been designed, fabricated and tested, where the measurement results are in good agreement with the simulation results. The overall size of the proposed LPF is only 11.4 mm 13.6 mm.
Author(s): M. Hayati, Z. Faramarzi, M. Amiri
File Type: Journal Paper
Issue:Volume: 29      Number: 5      Year: 2014
Download Link:Click here to download PDF     File Size: 776 KB

Title: Triple Notch UWB Antenna Controlled by Novel Common Direction Pentagon Complementary Split Ring Resonators
Abstract: A small-size CPW-feed multi-band planar monopole antenna is presented. A SwallowShaped-Patch (SSP) that covers the UltraWideband (UWB) frequency range is used in the proposed design. To create a multi-band antenna, several narrow pentagon slots, acting as resonance paths, can be integrated with the SSP antenna. Triple-band antennas are simulated and good results are obtained, while showing a very sharp band-rejection performance at 3.92 GHz, 5.34 GHz and 5.88 GHz, respectively. The antennas have omnidirectional and stable radiation patterns across all the relevant bands. Moreover, a prototype of the triple-band antenna is fabricated and measurement results are compared with simulation results.
Author(s): B. Yan, D. Jiang, J. Chen
File Type: Journal Paper
Issue:Volume: 29      Number: 5      Year: 2014
Download Link:Click here to download PDF     File Size: 2155 KB

Title: Susceptibility of a Simple Transmission Line Inside an Enclosure Against Normal Incident Plane Wave
Abstract: In this paper, susceptibility of a Microstrip Transmission Line (MTL) as a simple Printed Circuit Board (PCB) against a normal incident plane wave is studied. Here, the induced voltage on the open port of the MTL is considered as the susceptibility criterion for the MTL. Two different approaches are applied: the Method of Moments (MoM) and the Finite Integration Technique (FIT). In addition to simulations, we performed measurements inside a semi-anechoic chamber. Both simulations show very good agreement with the measurements. In addition to frequency domain results, time domain induced open circuit voltage is calculated. The effect of different aperture sizes on the susceptibility of a shielded MTL is examined. It is shown that large apertures can multiply the disagreeable effect of the interfering wave on the MTL, compared to the case where no shield is utilized.
Author(s): S. Abadpour, P. Dehkhoda, R. Moini, S. H. H. Sadeghi, H. R. Karami
File Type: Journal Paper
Issue:Volume: 29      Number: 5      Year: 2014
Download Link:Click here to download PDF     File Size: 1039 KB