ACES Publication Search
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| Title: | ACES Journal April 2017 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 2125 KB |
| Title: | ACES Journal April 2017 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 107 KB |
| Title: | ACES Journal April 2017 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 10656 KB |
| Title: | FDTD Acceleration using MATLAB Parallel Computing Toolbox and GPU |
| Abstract: | We present a MATLAB based finite difference time domain (FDTD) method accelerated using the GPU functions in MATLAB’s parallel computing toolbox (PCT). Procedures to achieve significant speedups over a CPU implementation of the same code are outlined. The use of specialized code with NVIDIA's compute unified device architecture (CUDA) programming results in impressive computational speedups. However, this requires specialized programming knowledge to efficiently implement. The MATLAB PCT can be applied directly to pre-existing MATLAB FDTD code and obtain reasonable speedups over equivalent CPU code. We demonstrate several modifications to increase the efficiency on several different NVIDIA graphics cards. Benchmarks are presented on problems of practical size (millions of cells) with a CPML terminated domain. |
| Author(s): | J. E. Diener, A. Z. Elsherbeni |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1620 KB |
| Title: | A Novel Method to Solve 2nd Order Neumann Type Boundary Value Problems in Electrostatics |
| Abstract: | In this paper, the numerical method of nonpolynomial spline approximation is used to solve 2nd order Neumann type boundary value problems (bvp’s) in electrostatics. This new approach provides more accurate results than the polynomial approximations and the spectral methods. The literature contains very little on the solution of Neumann type bvp’s because of the fact that a unique solution does not exist for all problems. In electrostatics, Neumann type bvp’s are encountered for finding the electrostatic potential inside closed surfaces where the normal derivative of the electric potential is specified everywhere on the surface. Two examples are presented to prove the accuracy of the proposed method. In these examples, the governing differential equation is solved to find the electrostatic potential inside a region bounded by conductors that are maintained at constant voltages. The results are compared with the analytic solutions. |
| Author(s): | G. Sener |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1868 KB |
| Title: | Correlation Analysis between Multi-Sources in Indoor Corridors and Tunnels |
| Abstract: | In this paper, a model is presented to simulate wave propagation in indoor corridors and tunnels with imperfectly conducting walls. The model is based on the waveguiding effect of corridors and tunnels. This approach is based on assuming that the boundaries of the waveguide section are constant impedance surface as the surface impedance of the wall is almost independent of the angle of the wave incidence onto the wall. An analytical approach for the calculation of the signal correlation between the transmitters and receivers elements in tunnels and indoor corridors is proposed. A new approach for determining the best locations of the indoor access points is introduced based on minimum correlation between sources with minimum cross talk. A scenario is considered in order to check the accuracy of this model. This scenario is verified by comparing experimental and numerical simulation results. Good agreement is achieved. |
| Author(s): | H. M. El-Maghrabi, S. F. Mahmoud, A. M. Attiya, M. El-Said, E. A. Hashish |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1833 KB |
| Title: | Notch Antenna Analysis: Artificial Neural Network-based Operating Frequency Estimator |
| Abstract: | An artificial neural network (ANN) based estimator is presented for notch antenna analysis in terms of the operating frequency. The notch antenna is formed by loading an asymmetric slot on one side of a rectangular patch. Architecture of the estimator is constructed over an ANN model trained with the simulated data of the notch antennas. In order to constitute a data pool for training and testing the ANN model, 96 notch antennas with seven antenna parameters are simulated with respect to the operating frequency. Antenna parameters including the patch dimensions, height and relative permittivity of the substrate are used as input vector of the ANN model. The simulated data of 80 notch antennas are employed to train the ANN model. The estimator is corroborated through testing with the remainders 16 antenna data, verifying with antenna data in the literature and validating with a prototyped notch antenna data. The results show that the estimator simply and fast computes the operating frequency of the notch antennas in very close to real one without performing simulations or measurement. |
| Author(s): | K. Sabanci, A. Kayabasi, A. Toktas, E. Yigit |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1853 KB |
| Title: | Bandwidth-Enhanced Compact Meander Printed Dipole Antenna |
| Abstract: | A miniaturization design of printed dipole antenna is proposed in this paper with enhanced operating bandwidth. As an example, three designs including a printed dipole, a meander dipole and a loop meander dipole, used in the wireless communication at 2.46 GHz are presented. The parameters regarding expanding bandwidth and reducing antenna size are discussed in details. These two antennas are modeled, simulated and optimized using HFSS and CEMS. Fabrication of the antennas are also performed. The simulation results and measurements show that the method proposed in this paper make the printed dipole more compact and bandwidth efficient. |
| Author(s): | C. Yue, A. Elsherbeni, V. Demir, W. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 2015 KB |
| Title: | Design of a High Gain Bandwidth Improved Aperture Antenna Using a Frequency Selective Surface |
| Abstract: | In this paper a wideband, high-gain, and compact design of an aperture antenna has been proposed. In the proposed antenna a patch type frequency selective surface (FSS) as a superstrate has been placed in front of a rectangular aperture, mounted to a conducting ground plane. The proposed simple 3×3 patch type FSS has considerably enhanced the antenna performance, including the gain and the bandwidth concurrently. The proposed structure has been simulated to validate the obtained results. The maximum gain of 16.03 dB and 3-dB gain bandwidth of 19.7% (14.25–17.35 GHz) has been achieved. |
| Author(s): | M. Ghorbani, H. Ghorbaninejad |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1879 KB |
| Title: | Microstrip Patch Sensors for Complex Permittivity Measurement of Medium Loss Liquids Using 3D-FDTD |
| Abstract: | Two novel microstrip resonators are designed to measure the complex permittivity of medium loss liquids. These resonators have two layers, the first one is the sample layer and the second one is the base layer that the patch is printed on it. The base layer is suspended or inverted on the sample layer and the S-parameter is measured. The complex permittivity of the sample layer is extracted from the resonance frequency and the 3-dB bandwidth of the S-parameter. In this paper, binary mixtures of ethanol and methanol are used as sample layer. FDTD is a well-known computational method and is used for analyzing the structures. The experimental results for both of these resonators are really good and agree with reference values. |
| Author(s): | G. Moradi, M. Mosalanejad |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1980 KB |
| Title: | Analytical Model for E-Shaped Microstrip Patch Antenna |
| Abstract: | This paper presents a comprehensive insight of the E-shaped microstrip patch antenna through the introduction of its cavity model and circuit model. The cavity model of the E-shaped antenna postulates a central magnetic wall that subdivides the structure into two halves, each with the TM001 field configuration. On the other hand, the circuit model is formulated based on the segmentation yielded from the cavity model. It infers the dual-resonance of the antenna through its circuit equivalent aspect, while avoiding cumbersome computations. Both these models offer an in depth view on the operating principles of the E-shaped antenna and effectively relates to its desired performance. A proofof- concept design has been implemented. With the size of 147 × 112 mm2, the antenna design resonates at 2.4 GHz and 2.5 GHz. It is noted that the reflection coefficients of its circuit model yield a deviation of less than 4 dB from the actual board measurement. |
| Author(s): | K. Huat Yeap, W. Ismail, K. Ho Yeap |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1986 KB |
| Title: | A Circularly Polarized Miniaturized Patch Array Using Combination of Circle and Rectangular Lines in the Sequential Phase Feed Structure |
| Abstract: | A sequential phase (SP) feed array antenna circularly polarized (CP) with 2×2 patch array is presented. The feeding network consist of two piece of circle that are filled with rectangular lines and have four arms that make 900 phase difference for the corner truncated elements which are connected to the feeding network. The combination of circle and rectangular lines reduces the size of the feeding network and thus, the overall size of the antenna with good characteristics to prove the antenna performance, the prototype antennas built and the results come in the form of: the measured 10 dB impedance bandwidth is 0.5 GHz (3.45 - 3.95 GHz), and the measured 3-dB AR bandwidth is 0.3 GHz (3.45 - 3.75 GHz). |
| Author(s): | M. H. Rasekhmanesh, P. Mohammadi, A. Piroutiniya |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 2178 KB |
| Title: | A Miniaturized LPF with Sharp Transition-band Using Semi-circle Resonators |
| Abstract: | In this paper, a miniaturized microstrip low-pass filter (LPF) with sharp transition-band, wide stop-band and negligible insertion-loss in pass-band is proposed using semi-circle and butterfly resonators. The cutoff frequency of the proposed LPF is 1.75 GHz. The proposed LPF presents a wide stop-band from 2.1 to 23.73 GHz (2nd-14th harmonics) with -20 dB attenuation level. The overall dimension of the proposed filter is 0.11?g × 0.1?g. The sharpness of transition-band is 112 dB/GHz, from 1.75 to 2.26 GHz with corresponding attenuation levels of -3 dB and -60 dB, respectively. The insertion-loss in pass-band is less than 0.05 dB. The proposed LPF is simulated, fabricated and measured, which there is a good agreement between the results of simulation and measurement. The LPF has been designed for L-band applications. |
| Author(s): | Sa. Roshani, A. R. Golestanifar, A. H. Ghaderi, So. Roshani |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 2124 KB |
| Title: | Shielding Effectiveness Estimation of a Metallic Enclosure with an Off-center Aperture for Obliquely Incident and Arbitrary Polarized Plane Wave |
| Abstract: | A circuit model for the shielding effectiveness (SE) estimation of a metallic enclosure is proposed, whose off-center aperture is irradiated by the obliquely incident and arbitrary polarized plane wave. This new model has advantages in the following aspects. First, it can deal with the arbitrary angular and polarized incident wave other than the normal incident wave. The incident wave angle and polarization direction are considered in the proposed analytical formulas. Second, higher-order modes such as TEmn and TMmn are included to enable the model to be applicable in higher frequencies. Third, the impedance of the enclosure wall is considered rather than the perfect conductor assumption used in the published literatures, which removes the deficiency that the aperture impedance is zero when the length of the aperture is equal to an integral number of the wavelengths. The influences on the SE from different parameters such as the incident wave angle, the polarization direction as well as the enclosure wall thickness are investigated. Finally, the accuracy of the proposed model is validated by measurements, simulations and comparisons with other literatures. The proposed method is particularly useful for the shielding enclosure design in the electronic manufacturing industry. |
| Author(s): | D. Shi, N. Lv, Y. Gao |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1678 KB |
| Title: | Detection of the Faulty Sensors on Basis of the Pattern Using Symmetrical Structure of Linear Array Antenna |
| Abstract: | In this paper, a simple method is proposed to diagnose the position of the damaged sensors. The position of the damaged sensors is diagnosed on the basis of the null depth level and the number of nulls for the degraded radiation pattern. The method is initiated with tabulation of the array radiation pattern with a single damaged sensor. The corresponding pattern is set as the reference to the radiation pattern of the failed sensors. The tabulated damaged array sensors are compared to a configuration of the assumed damaged sensor. The radiation pattern with deeper null depth level will be the location of the damaged sensor. Moreover, the symmetrical sensor damaged (SSD) technique diagnose the position of damaged sensor, in which on the basis of nulls one can detect the location of damaged sensors. The proposed method diagnoses the location of damaged sensors on the basis of pattern without complex computation as compared to available methods. |
| Author(s): | S. U. Khan, M. K. A. Rahim, N. A. Murad, F. Zubir, O. Ayop, M. F. M. Yusoff, M. R. Hamid, R. Dewan |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 1634 KB |
| Title: | Antipodal Linear Tapered Slot Antenna with Dielectric Loading Using Substrate Integrated Waveguide Technology for 60 GHz Communications |
| Abstract: | The 60 GHz band is capable of providing high speed communication. In this paper a substrate integrated waveguide (SIW) fed high gain antipodal linear tapered slot antenna (ALTSA) is presented. In order obtain high gain the dielectric loading is applied to the ALTSA in addition to the corrugation structure. Using SIW technology, a highly efficient, compact and low cost planar design is realized. An electromagnetic field simulation tool is used for design and simulation of the antenna. SIW power divider is used for designing 1x4 ALTSA array. To validate the proposed design, prototype is fabricated and measured. The simulated results agree well with the measured values which validates the proposed design. The measured return loss of 1x4 ALTSA array is better than 12 dB over the entire 60 GHz band (57 GHz - 64 GHz). The measured gain of 1x4 ALTSA array is 23.1 ± 0.5 dBi over the 60 GHz band. |
| Author(s): | N. Tiwari, T. Rama Rao |
| File Type: | Journal Paper |
| Issue: | Volume: 32 Number: 4 Year: 2017 |
| Download Link: | Click here to download PDF File Size: 2224 KB |