ACES Publication Search
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| Title: | ACES Journal September 2020 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2242 KB |
| Title: | ACES Journal September 2020 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 7116 KB |
| Title: | ACES Journal September 2020 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21962 KB |
| Title: | Debye Parameters of Humidity-Varying Soils for Induction Logging Techniques |
| Abstract: | This paper focuses on the tabulation of calculated Debye coefficients for a wide range of soils for source waves ranging from 300 MHz to 2 GHz. Debye coefficients of different soils will produce accurate FDTD dispersive simulations for wireline logging purposes. The FDTD dispersion analysis is based on an Auxiliary Differential Equation (ADE) method which depends on the Debye coefficients. A complex set of soil data is acquired and used in a twostep numerical solver to calculate the Debye coefficients. For a wide range of soils, Debye coefficients were developed for one, two, and three pole expansions. Most fits for one pole fits were highly inaccurate, so the coefficients generated were disregarded. Coefficients for two and three term expansions were accurate and were generated and tabulated here. |
| Author(s): | A. Velasco, A. Z. Elsherbeni, J. E. Diener, M. F. Hadi |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1335 KB |
| Title: | Finite-Difference Time-Domain Simulation of Arbitrary Impedance using One Port S-Parameter |
| Abstract: | Many modern radio-frequency devices comprise both lumped-element components and complex geometries. Simulation of such a device requires modeling the electromagnetic interactions with both geometric features and lumped components. We present a method for including arbitrary lumped-element components into finite-difference time-domain (FDTD) simulations. The lumped-element components, which are described by their scattering parameters, are modeled in the Yee grid as dependent voltage sources. The mathematical formulation is described, along with its implementation into a FDTD simulator. For verification, simulation results of resistive, capacitive, and inductive loads are presented, and are compared to simulation results from previous lumped-element FDTD methods. This represents a first-step in modeling multiport networks described by their scattering parameters. |
| Author(s): | J. M. Kast, A. Z. Elsherbeni |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1758 KB |
| Title: | Non-quasi-static Effects Simulation of Microwave Circuits based on Physical Model of Semiconductor Devices |
| Abstract: | This work explores analyzing the non-quasistatic effects of a microwave circuit by employing a physical model-based field-circuit co-simulation method. Specifically, it uses the semiconductor physical model to characterize the semiconductor devices, and simulates the lumped circuit by cooperating semiconductor physical equations into Kirchhoff’s circuit equations. Then the lumped circuit simulation is hybridized with the finite-difference time-domain (FDTD) simulation by interfacing EM (electromagnetic) field quantities with lumped-element quantities at each timestep. Taken a microwave limiter circuit as an example, the simulation results agree well with the measured results, which prove that this method can characterize non-quasi-static effects well. As a comparison, the equivalent circuit modelbased co-simulation cannot characterize the non-quasistatic effects accurately. |
| Author(s): | K. Xu, X. Chen, Q. Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1517 KB |
| Title: | Application of Spectral Extrapolation Technique to Stepped-Frequency RCS Measurement |
| Abstract: | “Time domain gating” used in the steppedfrequency radar cross section (RCS) measurement causes the inaccurate frequency domain data, especially at two ends of the band. This paper proposes a spectral extrapolation method for improving the measured RCS at two ends of the band more exactly. The core idea is: the measured frequency domain data are extrapolated to obtain the unknown value out of band with an autoregressive model (AR model). The parameter in the AR model is calculated by the maximum entropy spectral estimation algorithm. Therefore, the span of the original band is extended, and both ends of frequency on the original band are inside the range of the new band. If the time domain gating is adding to the new band, the precision at two ends of the original band can be greatly improved. The simulation and experimental results show that more effective frequency domain data near the two ends of the band can be predicted by using the spectral extrapolation method, and the maximum error at the ends of the original band is less than 1dB after extrapolation, so it can ensure the accuracy of RCS measurement over the whole frequency band. |
| Author(s): | C. F. Hu, N. J. Li, C. H. Fang |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1562 KB |
| Title: | Skeletonization Accelerated Solution of Crank-Nicolson Method for Solving Three-Dimensional Parabolic Equation |
| Abstract: | Parabolic equation models discretized with the finite difference method have been extensively studied for a long time. However, several explicit and implicit schemes exist in the literature. The advantage in explicit schemes is its simplicity, while its disadvantage is conditional stability. On the other hand, implicit schemes are unconditionally stable but require special treatment for a fast and accurate solution such as the Crank-Nicolson (CN) method. This method becomes computationally intensive for problems with dense meshes. The resulting matrix from the CN in two and three-dimensional cases requires high computational resources. This paper applies hierarchical interpolative factorization (HIF) to reduce the computational cost of the CN method. Numerical experiments are conducted to validate the proposed HIF acceleration. |
| Author(s): | H. F. Rasool, C. Jun, X.-M. Pan, X.-Q. Sheng |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1611 KB |
| Title: | Design and Finite Element Analysis of a Novel Permanent Magnet Assisted Reluctance Synchronous Motor |
| Abstract: | In this paper, a permanent magnet assisted synchronous reluctance machine (PMASRM) with optimized permanent magnet width and asymmetric rotor structure is proposed. A typical PMASRM is selected as the reference motor (Pre-optimized PMASRM). In order to reduce the large torque ripple of conventional PMASRM, an optimization method to design the permanent magnet width is investigated and the Optimized Magnet-width PMASRM is proposed. On this basis, an asymmetric flux barriers structure is proposed to further reduce the torque ripple. Some electromagnetic characteristics including air-gap flux density, no-load back EMF and motor efficiency are examined by Finite Element Analysis (FEA). The simulation results show that the proposed PMASRM can not only decrease the harmonic component of no-load back EMF obviously, but also reduce the torque ripple in steady-state operation, which proves the rationality of the motor structure. |
| Author(s): | X. Deng, R. Li, L. Hao, A. Zhang, J. Zhou |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1828 KB |
| Title: | A Hybrid Approach on Metamaterial-Loaded Fractal Antenna Design |
| Abstract: | The paper provides the interoperable hybrid Grasshopper–Grey Wolf optimization (GHGWO) of the Square Split-Ring Resonator (SRR) metamaterial unit cell. This paper discusses the complex phase strategies of the electric and magnetic interplay of the charged microstrip line of the split ring resonator (SRR). Optimized unit of metamaterial cells for their bandwidth enhancement is packed into a new square fractal antenna. In the interim period of dual band efficiency, a new design is introduced for a microstrip line-feeding square fractal antenna with a faulty ground composition. In the second stage, a quasi-static SRR model is being used to streamline its structural parameters in an effort to reinforce the bandwidth so that optimized composition resonates at the required intensity area. In the GHGWO hybrid algorithm, SRR unit cell size limitations should be optimized and the convergence actions of the algorithm improved. Certain evolutions termed modified hybrid BF-PSO classical BFO, chaos PSO and IWO are being tested for efficiency of the Hybrid GHGWO algorithm. In the final stage, optimized SRR unit cells are stacked into a square fractal antenna that provides bandwidth output suited to wireless usages with upper and lower band. The prototype square fractal antenna without and with SRR unit cells is efficiently evaluated by trial results. |
| Author(s): | D. Prabhakar, C. H. Rajendra Babu, V. Adinarayana, V. V. K. D. V. Prasad |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1527 KB |
| Title: | Design and Analysis of EBG Antenna for Wi-Fi, LTE, and WLAN Applications |
| Abstract: | A non-planar electromagnetic band gap (EBG) structured antenna is proposed in this paper for wireless communication applications. The proposed design consists of coplanar waveguide (CPW) fed square patch antenna embedded with triangular EBG backing on FR-4 substrate material for 2.4 GHz (Wi-Fi, LTE) and 5.2 GHz (WLAN) applications. Gain is improved from 2.8 dB to 13.9 dB by adding EBG structure in the proposed antenna and the parametric analysis is done for optimizing the antenna performance characteristics. The proposed antenna provides a maximum efficiency of 82.5% in the resonating frequencies. The prototyped antenna is having good correlation with the simulation results obtained from Finite Element Method (FEM) based Anyss-HFSS. High Frequency Structure Simulator is used to analyze the antenna parameters and the simulated and measured results are correlating well with each other with a slight change in frequencies. |
| Author(s): | P. Bora, P. Pardhasaradhi, B. T. P. Madhav |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2284 KB |
| Title: | Design of Reconfigurable Patch Antenna in Frequency, Pattern, and Switchable Polarization |
| Abstract: | In this paper, a circularly polarized frequency, pattern, and polarization switching antenna is proposed. The antenna consists of an octagonal patch, a narrow octagonal ring and four diamond-shaped parasitic patches on the top layer. Two feed points of the radiating patch are connected to a Wilkinson power divider loaded with the phase reconfigurable transmission lines on the bottom layer. Reconfiguration of the polarization and pattern is realized by using PIN diodes as switching components. By controlling the bias voltage across the varactors, various narrow frequency bands can be achieved. The proposed antenna operates at a frequency tuning range from 1.96 to 2.03 GHz. The radiation pattern can be switched among five cases in yoz-plane and xoz-plane, with the switchable polarization between left- and right-hand circular polarization. In addition, these three types of reconfiguration can be controlled independently. |
| Author(s): | Y. Zhang, D. Sun, T. Dong, J. Yin |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2308 KB |
| Title: | A SIW Horn Antenna without Broad Wall Loaded with Trapezoidal Air Slot |
| Abstract: | In this paper, a SIW horn antenna without broad wall loaded with trapezoidal air slot is proposed, processed, and tested. Based on the SIW horn antenna, this antenna strips off the wide wall at the horn diameter, introduces surface waves on the surface of the dielectric substrate, and improves the impedance matching between the antenna and free space. Further, trapezoidal air slots are loaded on the exposed dielectric substrate, gradually changes the dielectric constant of the dielectric substrate, so that the dielectric constant of the dielectric substrate can get closer to which of air, and the working bandwidth can be further expanded. The actual measurement results show that the working bandwidth of the antenna is 15.2-38GHz, the relative bandwidth reaches to 85.7%, and the maximum gain in the band is 9.1dBi. |
| Author(s): | M. Zhang, W. Li, S. Liu, X. Liu, C. Wu, J. Deng |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1597 KB |
| Title: | Finite Ground CB-CPW Bandpass Filter using Vertically Installed Coupled Open-ended Stubs |
| Abstract: | In this paper, a conductor backed coplanar waveguide (CB-CPW) 3rd order bandpass filter is designed using coupled open-ended stub resonator placed vertically to the signal line. Vertically loaded open ended stubs are designed at quarter wavelength so as to behave like a short circuit at the input terminal thus giving a band-accepted response with lesser metallic area or minimum size. Four such coupled open ended resonators are placed in series and also in closely manner to provide greater field confinement of the proposed bandpass filter. The bandpass filter is designed for a center frequency of 2.5 GHz with FBW of 97.89%, insertion loss of <0.5dB, rising and falling edge selectivity of 30.75 dB/GHz and 27.01dB/GHz respectively with a wide stopband of around 4GHz after the desired passband. Further to validate the design technique six such resonators are placed to obtain 5th order bandpass filter. |
| Author(s): | P. Mondal, S. K. Parui, R. Bera |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1432 KB |
| Title: | An X-Band GaN HEMT Oscillator with Four-Path Inductors |
| Abstract: | An X-band GaN HEMT oscillator implemented with the WIN 0.25 μm GaN HEMT technology is proposed. The oscillator consists of a HEMT amplifier with an LC feedback network with four-path inductors. With the supply voltage of VDD = 2 V, the GaN VCO current and power consumption of the oscillator are 10.8 mA and 21.6mW, respectively. The oscillator can generate single-ended signal at 8.82 GHz and it also supplies output power 1.24 dBm. At 1MHz frequency offset from the carrier the phase noise is 124.95 dBc/Hz. The die area of the GaN HEMT oscillator is 2×1 mm2. |
| Author(s): | W.-C. Lai, S.-L. Jang |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1526 KB |
| Title: | Artificial Magnetic Conductor Based Miniaturized Frequency Re-configurable Dielectric Resonator Antenna for 5G and WBAN Applications |
| Abstract: | In this work a novel miniaturized frequency reconfigurable Dielectric Resonator antenna using Artificial Magnetic Conductor (AMC) surface is proposed. The prototype is set to work for 5G mid-band frequencies and Wireless Body Area Network (WBAN) applications. The work consists of two parts: firstly, the miniaturization of the prototype using AMC surface and secondly using the same AMC surface to reconfigure the frequency to another wireless application. Using AMC surface, the DR volume is reduced by 85% percent. Connecting the AMC unit cells through ideal switches (micro-trip slabs) re-configures the DR for different frequency. The overall performance observed before switching as well as after switching in both the cases is promising. The design is fabricated for performance analysis. A close agreement is reported between simulated and measured values of the reflection coefficients, radiation pattern, gain and efficiencies. The prototype has stable radiation pattern for both the operating frequencies. The impedance bandwidth values for both the resonance frequencies are 14.2% and 16% respectively. The prototype has a maximum gain of 6.8dBi and a maximum efficiency of 88%. |
| Author(s): | S. Khan, H. Ali, S. U. A. Shah, H. Ali, C. Tanougast |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2082 KB |
| Title: | Retrodirective Transceiver Utilizing Phased Array and Direction Finder |
| Abstract: | Retrodirectivity have several important applications in communication and in wireless power transfer. In this paper, frequency sensitive retrodirective transceiver is proposed. It receives a signal and infers its direction from its frequency spectrum, then it can transmit a new signal back to the same or other direction at the designer wish. To determine the direction of the coming signal, a 0.85-1.15GHz frequency scanning phased array antenna is used so that the received signal would have a distorted spectrum with the maximum amplitude frequency component linked to the direction of the signal. Based on the frequency scanning, the retrodirectivity system can be used for wireless power transfer or for reactive jamming. Special circuit is designed to receive the signal with strongest power and to isolate the frequency component with maximum amplitude. Phase-locked loop (PLL) circuit is used to link such frequency to specific phase shift that is introduced to the transmitter array antenna to send a new signal to the same direction of the received signal. ADS simulation is performed to demonstrate the performance of each block. |
| Author(s): | M. Aseeri, W. Alomar, H. Alotaibi, A. Aljurbua |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1812 KB |
| Title: | Near-field BER and EVM Measurement at 5.8 GHz in Mode-stirred Metal Enclosure |
| Abstract: | This work presents over-the-air (OTA) performance, near-field bit-error-ratio (BER), and error vector magnitude (EVM) measurement using software-defined radio (SDR) in the mode-stirred metal enclosure at 5.8 GHz. The metal enclosure is stirred at 5.8 GHz using metallic paddle rotating with uniform speed. Paddle rotation creates a uniform electromagnetic field in the metal enclosure. The electromagnetic field environment in the metal enclosure can be controlled by loading the cavity with absorbing material. Field absorption can be different depending on the amount of absorbing material and location of the absorbers in the metal enclosure. It is shown that signal attenuation increases as we increase the number of absorbers. BER and EVM are measured in this environment and the performance of SDR based digital receiver is analyzed in this environment at RF frequency of 5.8 GHz. |
| Author(s): | M. Lodro, C. Smart, G. Gradoni, A. Vukovic, D. Thomas, S. Greedy |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2052 KB |
| Title: | A Method Using Magnetic Eddy Current Testing for Distinguishing ID and OD Defects of Pipelines under Saturation Magnetization |
| Abstract: | Distinguishing the inside (ID) and outside (OD) defect is an essential problem for the oil and gas pipeline nondestructive testing in engineering. The most widely used solution is to combine a magnetic flux leakage (MFL) section and a second section. For the strong magnetic field environment of the MFL, the second section and the MFL section are usually located at different mechanical positions, which leads to an increase in the length of the pipeline inspection gauge (PIG) and a decrease in the reliability. In this paper, a new impedance measurement method and the concept of the defect impedance angle are proposed to distinguish the ID and OD defects of pipelines under saturation magnetization, which based on the magnetic eddy current testing (MECT). The proposed ID & OD detection method can work with the MFL in the same mechanical position. Meanwhile, the proposed method also has the advantage that the discrimination criteria of the ID and OD defect keeps consistent with the classic eddy current testing (ECT). Furthermore, the robustness and sensitivity of the proposed method are discussed and verified by physical experiments. |
| Author(s): | Y. Long, S. Huang, Y. Zheng, S. Wang, W. Zhao |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2017 KB |
| Title: | An Analytical Model of a New T-cored Coil Used for Eddy Current Nondestructive Evaluation |
| Abstract: | A model of an axisymmetric probe with a new T-core coil that can be used in eddy current testing is developed. The truncated region eigenfunction expansion (TREE) method is used to analyze the coil impedance problem of the T-core coil located above a multi-layer conductive material. First, the magnetic vector potential expressions of each region are formulated, then the coefficients of the magnetic vector potential are derived by using the boundary conditions, finally, the closed form expression of the coil impedance is obtained. The normalized impedance changes of the T-core coil caused by the presence or absence of the multi-layer conductor are calculated using Mathematica. The presented T-core coil is compared with I-core coil and air-core coil. The effects of the T-core parameter a2, relative permeability μf and the thickness of the top section on the change in the coil impedance are discussed respectively. The analytical calculation results are compared with the results of finite element method, and the two agree very well, which verifies the correctness of the proposed T-core coil model. |
| Author(s): | S. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 9 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1412 KB |