ACES Publication Search
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| Title: | ACES Journal July 2016 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 28178 KB |
| Title: | ACES Journal July 2016 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 38 KB |
| Title: | ACES Journal July 2016 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 24192 KB |
| Title: | Direction Finding System Using Planar Luneburg Lens |
| Abstract: | In this paper, a novel two-dimensional Luneburg lens, composed of artificial impendence surfaces (AIS), is proposed for direction of arrival (DOA) estimation. Several detectors are mounted around the Luneburg lens to estimate the DOA of a microwave signal, owing to the surface wave can be focused perfectly on the diametrically opposite side of the lens. The desired refractive index profile of the Luneburg lens is controlled by the variable surface impendence of the unit cells, which is obtained by using an array of complementary unipolar compact photonic band gap (UC-PBG) structure inside a parallel plate waveguide. The proposed Luneburg lens with several probes, which operate in X-band region, are fabricated and measured to demonstrate the direction finding system. Both simulation and measured results show that the system has an excellent focusing ability, and the measured resolution of the system agrees very well with the theoretical value. |
| Author(s): | H. Yu, X. Ding, K. Zhang, Y. Wu, Q. Wu |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 2306 KB |
| Title: | Mutual Coupling Reduction in MIMO Patch Antenna Array Using Complementary Split Ring Resonators Defected Ground Structure |
| Abstract: | In this paper, complementary split ring resonators (CSRRs) defected ground structure (DGS) is introduced to suppress surface waves and to reduce the mutual coupling between E-plane coupled two elements of a microstrip patch MIMO antenna array. The CSRRs- DGS is easily etched on the ground plane between the array elements. The CSRRs-based DGS acts as a bandstop filter between the array elements and operates in the same desired frequency band of the array at 9.2 GHz. Significant reduction of the electromagnetic (EM) mutual coupling is achieved between array elements with a reduced edge-to-edge spacing of 7.5 mm (0.22 ?o). Experimental results show that more than 30 dB isolation between the array elements is obtained using an array of CSRR-based DGS. Moreover, the antenna array parameters are successfully optimized with a numerical experimentation technique using a 3D full-wave EM simulator. The design of the proposed array is fabricated and measured for verification purposes. The proposed design has been simulated and validated experimentally. Good agreement is found between the simulated and the measured data. |
| Author(s): | H. A. Attalah, A. B. Abdel-Rahman, K. Yoshitomi, R. K. Pokharel |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1027 KB |
| Title: | Experimental Study of Coupling Compensation of Low Profile Spiral Antenna Arrays Response for Direction-finding Applications |
| Abstract: | An experimental study of coupling compensation for AOA estimation using compact low profile antenna arrays with element separations of a quarter wavelength has been conducted. Two circular arrays of low profile miniaturised logarithmic spiral antennas deployed on a circular metal plate were used for data acquisition. Using the MUSIC direction-finding algorithm, the AOA estimation errors in receiving mode were observed before and after compensation: the errors were significantly decreased by coupling compensation. |
| Author(s): | T. S. Ghazaany, S. Zhu, R. A. Alhameed, J. M. Noras, S. M. R. Jones, T. V. Buren, T. Suggett, S. Marker |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1973 KB |
| Title: | Mutual Coupling Reduction in CBS Antenna Arrays by Utilizing Tuned EM-EBG and Non-planar Ground Plane |
| Abstract: | Radiation surface wave (surface current) on ground plane has a destructive effect on the characteristics of antennas which benefits from a common ground plane, especially Cavity Backed Slot (CBS) antennas. Surface current increases mutual coupling in an antenna array. This in turn causes unwanted characteristics in array applications. The main goal of this work is to design a new modified antenna array achieving less mutual coupling by reshaping ground plane and using tuned Elongated Mushroom Electromagnetic Band Gap (EM-EBG). Moreover, in this study, we focus on the influence of changing depth of EM-EBG holes. In this regard, four different designs for CBS antenna arrays are investigated. The results reveals that by using two new methods, namely stepped ground plane and tuned EMEBG, mutual coupling will be decreased by more than 9 dB. Decrement of mutual coupling improve radiation characteristic of array such as Front to Back Ratio (FBR) by 8 dB. The effectiveness of our design is confirmed by experimental results. |
| Author(s): | S. Manshari, F. H. Kashani, G. Moradi |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1270 KB |
| Title: | Artificial Neural Network based Design of RF MEMS Capacitive Shunt Switches |
| Abstract: | Artificial neural networks (ANNs) have appeared as a very efficient alternative to time consuming full-wave simulations of electrical characteristics of RF MEMS. In this paper, a new ANN based method to be used in the design of RF MEMS devices is proposed. ANNs are trained to model dependence of the scattering parameters and the resonant frequency of an RF MEMS switch on the switch geometrical parameters, as well as to perform the opposite procedure, i.e., to determine values of the geometrical parameters to achieve the desired electrical resonant frequency. The developed models can be used for fast simulation and optimization of the switch characteristics replacing time consuming procedures in full-wave simulators, which leads to a significant reduction of time needed for the device design. |
| Author(s): | Z. Marinkovic, T. Kim, V. Markovic, M. Milijic, O. Pronic-Rancic, T. Ciric, L. Vietzorreck |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1364 KB |
| Title: | Vector Hysteresis Modeling in Arbitrarily Shaped Objects Using an Energy Minimization Approach |
| Abstract: | It is known that proper and efficient modeling of vector hysteresis is crucial to the precise design and performance estimation of electric power devices and magnetic recording processes. Recently, discrete Hopfield neural networks have been successfully utilized in the construction of vector hysteresis models. This paper presents a novel energy-minimization Hopfield neural network approach to implement Stoner-Wohlfarthlike vector hysteresis operators in triangular sub-regions. Advantages of the approach stem from the nonrectangular nature of such operators, which could mimic major hysteresis loops as well as their implementation in the most commonly used triangular discretization subdomains. Details of the approach are given in the paper. |
| Author(s): | A. A. Adly, S. K. Abd-El-Hafiz |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1305 KB |
| Title: | Generalized Spectral Decomposition Approach to a Stochastic Finite Integration Technique Electrokinetic Formulation |
| Abstract: | In order to efficiently solve the stochastic finite integration technique formulation for electrokinetics, a recently proposed generalized spectral decomposition approach is applied. Compared to the standard approach, the proposed method drastically reduces the computational burden. The results are validated by comparison with those obtained with high order polynomial chaos expansion, taken as the reference solution. |
| Author(s): | L. Codecasa, L. Di Rienzo |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 450 KB |
| Title: | Efficient Representation of Multilevel QR Algorithm for Analysis of Microstrip Structures |
| Abstract: | This paper presents a novel approach for the efficient solution of large-scale microstrip structures with the mixed potential integral equation (MPIE) in conjunction with the method of moments (MoM) based on the conventional Rao-Wilton-Glisson (RWG) basis functions. Although multilevel QR (MLQR) is efficient compared with direct method, it consumes more computation time and storage memory. A novel matrix compression technique is presented to recompress the sub-matrices of MLQR algorithm. The advantages of applying the novel recompression technique are illustrated by numerical results, the computation time as well as the memory requirements are compared to the conventional MLQR algorithm and the matrix decomposition algorithm-singular value decomposition (MDA-SVD). It is demonstrated that the use of proposed method can result in significant savings in computation time and memory requirements, with little or no compromise in the accuracy of the solution. |
| Author(s): | Z. Jiang, T. Wan |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 486 KB |
| Title: | Analytical Solution for Line Source Excitation of a PEMC Cylinder Coated with Multilayer Anisotropic Media |
| Abstract: | An analytical solution is presented for line source excitation of a cylinder with perfect electromagnetic conductor (PEMC) core which is coated with multilayer anisotropic materials. Exact solution is presented using analytical relations for scattering from cylindrical structures. For multilayer structures, we have to calculate the inverse of a matrix which is sparse, thus, we use recursive relations to calculate the fields. A recursive relation for solving the problem with PEMC boundary condition is presented. Finally, some examples are given using this method and the results are compared and validated with the simulation results and other works. The advantage of analytical relation proposed in this paper is much less run time compared to numerical simulation. |
| Author(s): | A. Shahi, M. Fallah, A. Abdolali |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 787 KB |
| Title: | A Compact Design of Planar Array Antenna with Fractal Elements for Future Generation Applications |
| Abstract: | In this paper, a planar phased array fractal antenna for the future fifth generation (5G) applications is presented. The proposed array antenna is designed to operate at 22 GHz. 64 patch antenna elements with coaxial-probe feeds have been used for the proposed design. The antenna elements are based on Vicsek fractal geometry where the third iteration patches operate over a wide bandwidth and contribute to improve the efficiency and realized gain performance. The designed planar array has more than 22 dB realized gain and -0.3 dB total efficiency when its beam is tilted to 0° elevation. The antenna configuration is simple, easy to fabricate and can be integrated into 5G devices. Simulated and measured results are presented to validate the usefulness of the proposed phased array antenna for 5G applications. |
| Author(s): | N. Ojaroudiparchin, M. Shen, G. F. Pedersen |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 2422 KB |
| Title: | A Compact Design and New Structure of Monopole Antenna with Dual Band Notch Characteristic for UWB Applications |
| Abstract: | In this paper, a compact design and new structure of monopole antenna with dual band notch characteristics for UWB applications has been presented. The antenna consists of a triangular patch with C-shaped slot, two L-shaped and one split ring shaped parasitic backplane elements structure. By inserting three slots in the rectangular truncated ground plane as defected ground structures (DGSs), much wider impedance bandwidth can be produced, and moreover to improve the input matching quality of the antenna at all its operating bands which are spread in a vast frequency range, a modified stepped feed-line is employed. These changes much improves the antenna’s impedance bandwidth by 112% which covers the entire UWB bandwidth range. In order to generate single band notch characteristic, split ring shaped parasitic element backplane structure is utilized on the ground plane side of the substrate. In addition, by etching a C-shaped slot on the radiating patch, a dual band notch function is achieved. The measured frequency results show an impedance bandwidth of 3.15-10.78 GHz for a Voltage Standing Wave Ratio (VSWR) less than 2 with two eliminated bands placed at 3.49-3.81 GHz (320 MHz, 8.8%) and 5.24-6.22 GHz (980 MHz, 17%), which reject the WiMAX band, and Wireless Local Area Network (WLAN) band, respectively. A prototype was fabricated and measured based upon optimal parameters and experimental results show consistency with simulation results. The measured radiation patterns of proposed antenna for most frequencies are omnidirectional and this antenna as wide impedance bandwidth. |
| Author(s): | S. Hoseyni, J. Nourinia, C. Ghobadi, S. Masumina, B. Mohammadi |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 2108 KB |
| Title: | A Compact and Miniaturized Broadband Phase Shifter Using Coupled-lines |
| Abstract: | In this paper, a compact and miniaturized broadband phase shifter using coupled-lines (CL) is proposed. This broadband phase shifter merely consists of two sections, one pair of CL as the reference and another two parallel CLs as the main body. An analysis of even-odd mode on the theoretical circuit is shown to explain the basic principle of the proposed phase shifter. For demonstration of this novel configuration, a broadband 90° phase shifter was designed and fabricated. The measured results present that the proposed phase shifter can provide a stable wide bandwidth (over 80%) of 90° phase difference with deviation less than 6.7°, good return losses more than 10 dB and low insertion losses less than 0.53 dB. |
| Author(s): | Y. Wu, S. Zhou, X. Shen, Y. Liu |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 767 KB |
| Title: | Mode Matching in Microstrip Antenna with both Electric and Magnetic Surface Current on Sidewall in Cavity Model |
| Abstract: | A model is developed to calculate the input impedance of a coaxially fed circular microstrip disc antenna in L band and C band. A mode matching approach with both electric and magnetic surface current is used, which makes it possible to improve the effects of modes. In addition, the method of images is used to remove the ground plane. Finally comparison is made with CST studio results, as it can be seen the theoretical calculations for input impedance are in good agreement with CST studio results except for minor shift in frequency. |
| Author(s): | F. R. Rostami, G. Moradi, R. S. Shirazi |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 476 KB |
| Title: | Design of Lowpass Filter and Lowpass-Highpass Diplexer with LTCC Technology |
| Abstract: | A compact lowpass filter (LPF) and a lowpasshighpass diplexer (LPD) with both sharp roll-off and wide stopband is presented in this paper. The proposed LPF is realized by cascading modified hairpin unit consisting of one U-shape stripline and one pair of offsetcoupled striplines with multilayer low-temperature cofired ceramic (LTCC) technology. The LPD is realized by shunting a lowpass filter and a highpass filter at a common junction to achieve all-reject in one port. Good agreement can be achieved by the simulated and measured results. |
| Author(s): | C. Zhou, Y. Guo, W. Wu |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 943 KB |
| Title: | Ferrite-Loaded Substrate Integrated Waveguide Frequency-Agile Bandpass Filter |
| Abstract: | In this paper, a ferrite-loaded substrate integrated waveguide (SIW) frequency tunable bandpass filter is presented. Two ferrite slabs are loaded at sidewalls of an SIW. When a DC magnetic bias is applied to the ferrite slabs, the equivalent width of the ferrite-loaded SIW is changed, which contributes to the tuning ability. As an example, a ferrite-loaded SIW frequency-agile bandpass filter is designed and fabricated according to this principle. Its center frequency can be adjusted from 12.35 GHz to 13.2 GHz. Within this frequency range, the insertion loss is changed from 2.3 dB to 3.9 dB and the return loss is better than 10 dB. |
| Author(s): | Q. D. Huang, Y. J. Cheng |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1255 KB |
| Title: | Simulation CW Light Propagation Through Macroscopic Scattering Media Via Optical Phase Conjugation |
| Abstract: | The pseudospectral time-domain (PSTD) technique is advantageous for modeling macroscopic light scattering problems but falls short to model a light source of realistic dimensions. We report a novel simulation technique that enables modeling a finite-width, continuous-wave (CW) light source within PSTD simulations that was infeasible before. |
| Author(s): | Y.-A. Huang, C.-H. Tsai, S. H. Tseng |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 649 KB |
| Title: | Analysis of Highly Sensitive Photonic Crystal Biosensor for Glucose Monitoring |
| Abstract: | In this study, a novel compact and fully integrated 2D photonic crystal (PhC) biosensor with high sensitivity has been proposed for Glucose monitoring. The simulation results are obtained using 2D finite element time domain method (FETDM). To evaluate the performance of the suggested design, the transmission spectrum through the reported structure has been calculated. The effect of the structure geometrical parameters of the biosensor is studied to maximize the biosensor sensitivity. The suggested biosensor offers high sensitivity of 422 nm/RIU with high linearity. Additionally, the suggested biosensor has a simple design and is easy for fabrication. The enhancement of the sensitivity of the PhC biosensor is very important to amplify the detection of the small variation in analyte’s physical properties. Therefore, the achieved sensitivity enhancement can improve the applications of Glucose monitoring. |
| Author(s): | M. S. Mohamed, M. F. O. Hameed, N. F. F. Areed, M. M. El-Okr, S. S. A. Obayya |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1236 KB |
| Title: | Ultra-Wideband Polarization Conversion Metasurface Based on Topology Optimal Design and Geometry Tailor |
| Abstract: | We presented a topology optimization method based on genetic algorithm (GA) combined geometry tailor scheme (GTS) to realize ultra-wideband polarization conversion metasurfaces (UPCM) in microwave range. The present method takes the connectivity condition of the elements into consideration, thereby resulting in good optimization efficiency. As examples, a UPCM is designed by topology optimization, which is composed of the dielectric substrate sandwiched with patched metallic patterns and continuous metal background. Three plasmon resonances are generated by electric and magnetic resonances, which lead to bandwidth expansion of cross-polarization reflection. The simulated results show that the maximum conversion efficiency is nearly 100% at the three plasmon resonance frequencies and the 3 dB bandwidth range from 5.66 to 24.68 GHz can be achieved for both normally incident x- and y-polarized waves. |
| Author(s): | S. Sui, J. Yu, H. Ma, J. Zhang, J. Wang, Z. Xu, S. Qu |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1774 KB |
| Title: | A Circuit Human Body Model for an Indirect Lightning Strike Analyzed by means of an FDTD Method |
| Abstract: | In the present paper, a simplified lumped element human body, stroked by a lightning touch volage, is designed and analyzed using the finitedifference time-domain (FDTD) method. The extracted results are compared with an electronic circuit simultor validating our numerical method. Moreover, other touch voltage scenarios are investigated, measuring and comparing the current that flows through different body parts. Additionally, the induced current to a human body, being in the vicinity of a lightning stroked object, is accurately calculated through the FDTD algorithm. The inability of the circuit modeler to simulate non-contact configurations proves the necessity of our numerical algorithm, while the possibility of the electric discharge effect is introduced. |
| Author(s): | V. A. Alrim, S. A. Amanatiadis, A. X. Lalas, C. S. Antonopoulos |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1417 KB |
| Title: | Numerical Analysis of Thermal Gradient & Magnetic Field using Ferrofluid Cooling |
| Abstract: | Ferrofluid is a colloidal suspension of single domain magnetic particles of diameter approximately 10 nm, coated with a molecular layer of a dispersant and suspended in a liquid carrier. Ferrofluids may form the basis for next generation noiseless, vibration free passive cooling technique. The pumping ability of ferrofluid depends on temperature gradient and magnetic field orientation. The proposed work covers numerical analysis of heat transfer, magnetism and flow characteristics of ferrofluids. Thermal conductivity and viscosity of ferrofluid governs the heat transfer and flow characteristics. The variation of flow with the direction of magnetic field has been investigated in this paper. |
| Author(s): | H. Garg, S. Singh, V. S. Negi, A. S. Kharola, A. K. Lall |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1971 KB |