ACES Publication Search
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| Title: | ACES Journal February 2021 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 2221 KB |
| Title: | ACES Journal February 2021 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 12569 KB |
| Title: | ACES Journal February 2021 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 23185 KB |
| Title: | Non-uniform Feeding Network for a Dual Circularly Polarized 16×16 Ku-Band Antenna Array for On-Move Satellite Communication |
| Abstract: | This paper presents analysis and design of a dual circularly polarized 16×16 Ku band antenna array with emphasis on its feeding network. The proposed antenna is designed for on-move satellite communication system where the radiation pattern and the side-lobe level should meet the ITU standards to avoid interference with other satellite systems. This requirement is obtained by using non-uniform feeding distribution network. In addition, dual circular polarization operation requires sequential feeding networks with appropriate phase shift sequences. The proposed antenna is divided into 16 sub-cells of 4×4 radiating elements. The elements inside the sub-cell are fed by uniform dual sequential feeding networks. These sub-cells are connected together via two non-uniform feeding networks on a single layer in the shape of two interlaced fork configurations. In addition, cascaded power dividers are used to achieve the required low power division ratios between some of the sub-cells according to the required feeding distribution. These modifications simplify the fabrication process of the proposed antenna structure and reduce the required layers while satisfying the required radiation parameters. |
| Author(s): | W. M. Hassan, K. M. Ibrahim, E. A. Abdallah, A. M. Attiya |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1790 KB |
| Title: | Compact 5G Hairpin Bandpass Filter Using Non-Uniform Transmission Lines Theory |
| Abstract: | A compact three order 5G low frequency band Hairpin Bandpass Filter (HPBF) is analyzed, designed and fabricated in this paper. The designed filter operates at 5G frequency range (5.975-7.125 GHz). 17.76% compactness in each λ/2 uniform transmission line (UTL) resonator of the filter is achieved by applying Non-Uniform Transmission Lines (NTLs) theory. This compactness will make modern wireless transmitter and receiver designs more compatible. Study on the best reduction size percentage and suitable constraints to design the required NTL resonator is highlighted in this paper. Six samples with different size reductions percentage are fabricated and measured. The simulation is carried out in this study uses High Frequency Structure Simulator (HFSS) software and Computer Simulation Technology (CST) software. The simulated results for UTL HPBF and NTL HPBF with the six cases are verified with measurement. For the best size reduction percentage design, the measured results demonstrated that the 6.55 GHz NTL and UTL HPBF show good impedance matching within the unsilenced 5G frequency band. |
| Author(s): | S. Saleh, W. Ismail, I. S. Z. Abidin, M. H. Jamaluddin |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 2091 KB |
| Title: | Gain Enhancement of a Traditional Horn Antenna using 3D Printed Square-Shaped Multi-layer Dielectric Lens for X-band Applications |
| Abstract: | In this work, gain of a traditional horn antenna is enhanced up to 2.9 dB over X-band using 3D printed square-shaped multi-layer lens. For this purpose, firstly the multi-layer lenses are designed using Invasive Weed Optimization (IWO) and simulated in 3-D CST Microwave Studio (MWS) environment as consisting of square-shaped five layers with variable dielectric constants and heights. Thus, optimum values of the dielectric constants and heights are resulted limiting from 1.15 to 2.1 and 9.2 mm to 10 mm, respectively compatible for Fused Deposition Modeling (FDM) based 3D-printing process. Finally, the optimum lens is realized by 3D printer via FDM evaluating infill rate of cheap Polylactic Acid (PLA) material for each layer. The simulated and measured performance of the multi-layer dielectric structures are hand to hand. The horn antenna equipped by our proposed dielectric lens achieves gain enhancement of the traditional antenna up to 2.9 dB over the operation band. Furthermore, the proposed design is compared with the counterpart designs in literature and based on the comparison results it can be said that the proposed design achieves the better performance in the smaller in size as equipped a traditional X-band horn antenna. |
| Author(s): | A. Belen, P. Mahouti, F. Gunes, O. Tari |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1434 KB |
| Title: | A New Metasurface Structure for Bandwidth Improvement of Antenna Array |
| Abstract: | In this paper, the design of an antenna array with enhanced bandwidth is presented. The antenna array includes 16 elements (4 x 4) based on RT5880 with height of 1.575 mm, dielectric constant of 2.2 and loss tangent of 0.0009 and it is yielded at the central frequency of 5.8 GHz for Wireless Local Area Network (WLAN) applications. In addition, in order to enhance bandwidth for antenna, the paper proposes a new metasurface. The metasurface, which is a lattice of 3 x 3 cells, is printed on a substrate of FR4 (h = 1.6 mm, ɛr = 4.4, and tanδ = 0.02) and it acts as an artificial magnetic conductor reflector. The final prototype with an overall dimension of 123 x 120 x 3.315 mm3 was fabricated and measured. The antenna witnesses an impedance bandwidth of 5.1-7.5 GHz at -10 dB (41%) and a peak gain of 17.65 dBi for measurement. The simulation results are confirmed by measurement ones to verify the performance of the proposed antenna. |
| Author(s): | L. N. Nguyen |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1696 KB |
| Title: | A Compact CPW-Fed UWB Antenna with Dual-Band Notched Characteristics for WiMAX/WLAN Applications |
| Abstract: | A dual-notched bands ultra-wideband (UWB) antenna with coplanar waveguide (CPW) fed is presented in the paper. The two notched bands are selected at 3.5 and 5.8 GHz frequencies to overcome the interference from WiMAX and WLAN bands. The overall size of the antenna is 17.5×17.5 mm2, which can be considered as one of the smallest UWB antennas in the literature. The developed antenna has an impedance band width ranging from 2.9 to 13 GHz. The measured radiation patterns on E and H planes are nearly omni-directional and stable with acceptable gain over the entire band. The dual-band notched at WiMAX and WLAN is created by embedding I-shaped and C-shaped stubs in the radiation patch of the antenna. Due to the compactness, good radiation patterns and the reasonable stable gain, this antenna is well suited for integration into portable wireless communications devices for UWB applications. |
| Author(s): | R. W. Aldhaheri, I. S. Alruhaili, K. J. Babu, M. M. Sheikh |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1612 KB |
| Title: | A Frequency and Polarization Reconfigurable Dual-Patch Microstrip Antenna for Wireless ISM Band |
| Abstract: | This paper proposes a reconfigurable microstrip patch antenna design for wireless ISM band applications. The antenna simultaneously uses PIN Diodes to switch between linear and circular polarization at 2.45 GHz and uses Varactor Diode to continuously tune the operating frequency from 1.73 GHz to 2.45 GHz. The antenna performance is characterized as a combination of ON/OFF state of PIN Diode and a bias voltage of Varactor Diode varying from 0.8V to 10V. A good agreement between simulation and measurement is obtained which validates the proposed method. The proposed frequency/polarization reconfigurable antenna is promising for various applications in wireless ISM band such as DCS (1710 – 1880 MHz), PCS (1850 – 1990 MHz), GSM 1800, GSM 1900, UMTS (1920 – 2170 MHz) and WiFi/Bluetooth (2.4 – 2.5 GHz). |
| Author(s): | C. D. Bui, T. C. Dang, M. T. Doan, T. K. Nguyen |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1491 KB |
| Title: | Efficient Electromagnetic Analysis of a Dispersive Head Model Due to Smart Glasses Embedded Antennas at Wi-Fi and 5G Frequencies |
| Abstract: | Numerical study of electromagnetic interaction between an adjacent antenna and a human head model requires long computation time and large computer memory. In this paper, two speeding up techniques for a dispersive algorithm based on finitedifference time-domain method are used to reduce the required computation time and computer memory. In order to evaluate the validity of these two speeding up techniques, specific absorption rate (SAR) and temperature rise distributions in a dispersive human head model due to radiation from an antenna integrated into a pair of smart glasses are investigated. The antenna integrated into the pair of smart glasses have wireless connectivity at 2.4 GHz and 5th generation (5G) cellular connectivity at 4.9 GHz. Two different positions for the antenna integrated into the frame are considered in this investigation. These techniques provide remarkable reduction in computation time and computer memory. |
| Author(s): | F. Kaburcuk, A. Z. Elsherbeni |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1485 KB |
| Title: | Frequency Band Rejection Technique Based on the Operating Modes for a Wideband H-Shaped DRA |
| Abstract: | In this paper, a new approach to create frequency band rejection is applied to a wideband Hshaped dielectric resonator antenna (DRA). In order to create a notch characteristic in the operating band of the TEy1δ1 and TEy2δ1 modes, and guided by their theoretical and simulated electric field distributions, a narrow conductive strip is incorporated around the mid-section of the H-shaped DRA. The orientation of the notching strip is determined based on the electric field distribution of the selected modes for the frequency rejection. Furthermore, the selected feeding method improves the radiation patterns for this DRA shape compared to its previous designs. The new design offers an operating frequency range that extends from 4.15 to 9.8 GHz, allowing 81% of fractional bandwidth. The first notch is created at 6.5 GHz, while the second one is at 8 GHz. Average radiation efficiency of 95% across the frequency of interest is achieved with overall dimensions of 40×30×11.4 mm³. The proposed design is simulated using Ansys HFSS and validated by measurement. |
| Author(s): | F. Z. Abushakra, N. Jeong |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1612 KB |
| Title: | Uncertainty Quantification of the Crosstalk in Multiconductor Transmission Lines via Degree Adaptive Stochastic Response Surface Method |
| Abstract: | The degree adaptive stochastic response surface method is applied to analyze statistically the crosstalk in multiconductor transmission lines (MTLs). The coefficient of polynomial chaos expansion (PCE) is obtained based on the least angle regression. The truncation degree of PCE is iterated using the degree adaptive truncation algorithm, and the optimal proxy model of the crosstalk of the original MTLs that satisfies the actual error requirements is calculated. The statistical properties of crosstalk in MTLs (such as mean, standard deviation, skewness, kurtosis, and probability density distribution) are obtained. The failure probability of the electromagnetic compatibility in the MTLs system is considered. The global sensitivity indices of crosstalkrelated factors are analyzed. Finally, the proposed method is proved to be effective compared with the conventional Monte Carlo method. The uncertainty quantification of crosstalk in MTLs can be calculated efficiently and accurately. |
| Author(s): | Q. Yu, W. Liu, K. Yang, X. Ma, T. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1551 KB |
| Title: | Evaluation of Power Receiving Signal of 5G Small Cells for Outdoor/Indoor Environment at Millimeterwave Bands |
| Abstract: | This paper presents a simulation study of the outdoor and indoor propagation losses utilizing 5G small cells at suggested millimeter-wave frequencies of 26 GHz, 28 GHz, and 38 GHz. The environment of this study is conducted with penetration loss of new and old building characteristics. The simulation is performed with help of 3D ray tracing model NVIDIA OptiX engine and MATLAB. The targeted frequencies are 26 GHz, 28 GHz, and 38 GHz that specified by International Telecommunication Union ITU-R organization. The simulation routes are investigated in term of signal strength at multiple receiving points. The strength angular spectrum are represented for fixed points and the power receiving delay is presented by their attributes. The simulated responses showed an efficient and sufficient outdoor and indoor service might be provisioned at 26 GHz and 28 GHz. The received signals at 28 GHz and 38 GHz are found around 4.5 dB and 11 dB with comparison with signal received level at 26 GHz. However, at 38 GHz the indoor signal strength and power receiving delays demonstrate a weak signal reception which offers a poor solution to indoor user by outside fixed base station. |
| Author(s): | N. Hamid |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1534 KB |
| Title: | Spread Spectrum Time Domain Reflectometry and Steepest Descent Inversion Spread Spectrum Time Domain Reflectometry and Steepest Descent Inversion |
| Abstract: | In this paper, we present a method for estimating complex impedances using reflectometry and a modified steepest descent inversion algorithm. We simulate spread spectrum time domain reflectometry (SSTDR), which can measure complex impedances on energized systems for an experimental setup with resistive and capacitive loads. A parametric function, which includes both a misfit function and stabilizer function, is created. The misfit function is a least squares estimate of how close the model data matches observed data. The stabilizer function prevents the steepest descent algorithm from becoming unstable and diverging. Steepest descent iteratively identifies the model parameters that minimize the parametric function. We validate the algorithm by correctly identifying the model parameters (capacitance and resistance) associated with simulated SSTDR data, with added 3 dB white Gaussian noise. With the stabilizer function, the steepest descent algorithm estimates of the model parameters are bounded within a specified range. The errors for capacitance (220pF to 820pF) and resistance (50 Ω to 270 Ω) are < 10%, corresponding to a complex impedance magnitude |R +1/jωC| of 53 Ω to 510 Ω. |
| Author(s): | S. R. Kingston, H. Ellis, M. U. Saleh, E. J. Benoit, A. Edun, C. M. Furse, M. A. Scarpulla, J. B. Harley |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1409 KB |
| Title: | Dual-Mode Filter with High Design Flexibility Using Short-Loaded Resonator |
| Abstract: | This work presents a series of independent bandpass filters (BPFs) based on dual-mode resonators (DMRs) with short stub-loaded. BPFs conform to the 802.11n protocol and include three passbands with center frequencies and bandwidths of 2.46 GHz, 3.55 GHz and 5.22 GHz, 130 MHz, 130 MHz and 470 MHz. Insertion loss and reflection loss are 1.5 dB, 1.6 dB and 1.3 dB, 18 dB, 20 dB, 30 dB. The filters are useful in the WLAN/WIMAX applications with compact size. According to the current distributions along the resonator, the feed-lines with high design flexibility arms were introduced in order to supply the needed external coupling for the dual-/tri passbands simultaneously, and achieve good impedance matching in each passband. Finally, by the version 15 of High Frequency Structure Simulator (HFSS), three BPFs with single, dual and triple passbands were designed on the Rogers 5880 substrate with the relative dielectric constant ɛr = 2.2, substrate loss tanδ = 0.002, and the thickness h = 0.508 mm. The BPFs are measured by Agilent 85058E Vector Network Analyzer (VNA). The measured results have good agreement with the simulated ones. |
| Author(s): | Z. Zhu, K. Yang, X. Ren, L. Cao |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1520 KB |
| Title: | Analysis of EMI from Pantograph-catenary Arc on Speed Sensor Based on the High-speed Train Model |
| Abstract: | There will be the pantograph-catenary arc (PCA) when the pantograph of a high-speed train is separated from the power supply line, and the electromagnetic interference (EMI) caused by the PCA can affect speed sensors of the train. To study the influence of the PCA, firstly, the traction control unit (TCU) speed sensor of the high-speed train is researched. The result shows both overvoltage and electromagnetic radiation (EMR) generated by the PCA can influence the signal of speed sensor. Secondly, the composite model of the train is established. Then, the interference of the PCA on the TCU speed sensor is verified. The results of practical measurements show the PCA causes a maximum overvoltage of 680 V on train body (TB) and increases the magnetic field around TB to a maximum of 58 dBμA/m. This is the reason of sensor malfunction, which is consistent with the theoretical and simulation results. Finally, the methods to reduce the EMI of the PCA are proposed. |
| Author(s): | Y. Tang, F. Zhu, Y. Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1353 KB |
| Title: | Studying and Analysis of a Novel RK-Sinc Scheme |
| Abstract: | In this paper, a novel high-order method, Runge-Kutta Sinc (RK-Sinc), is proposed. The RK-Sinc scheme employs the strong stability preserving Runge- Kutta (SSP-RK) algorithm to substitute time derivative and the Sinc function to replace spatial derivates. The computational efficiency, numerical dispersion and convergence of the RK-Sinc algorithm are addressed. The proposed method presents the better numerical dispersion and the faster convergence rate both in time and space domain. It is found that the computational memory of the RK-Sinc is more than two times of the FDTD for the same stencil size. Compared with the conventional FDTD, the new scheme provides more accuracy and great potential in computational electromagnetic field. |
| Author(s): | M. Zhu |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1225 KB |
| Title: | Design and Analysis of a Novel Hybrid Excitation Flux Reversal Machine |
| Abstract: | A novel hybrid excitation flux reversal machine (HEFRM) is developed. The machine has a simple reluctance rotor and a stator, which has both an ac armature winding and a dc field winding. The core on the surface of the pole arc at the centerline of the stator pole and the core on the outer surface of the stator yoke each have a slot along the rotating axis, where the field windings are placed. A permanent magnet (PM) with opposite polarity is placed respectively on each side of a slot in the same stator pole. In this paper, the working principle of the new HEFRM is introduced, the influence of magnetic pole parameters and armature parameters on motor performance are also analyzed, and genetic algorithm (GA) is used for multi-objective optimization of the torque characteristics. Finally, the HEFRM prototype is built, and its theoretical correctness is verified by the finite element analysis (FEA). |
| Author(s): | X. Deng, Z. Jia, X. Zhao |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 2 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1641 KB |