ACES Publication Search
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| Title: | ACES Journal January 2016 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 2502 KB |
| Title: | ACES Journal January 2016 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 102 KB |
| Title: | ACES Journal January 2016 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 10132 KB |
| Title: | A Novel Compact UWB Monopole Antenna with Triple Band-Notched Characteristics with EBG Structure and Two Folded V-slot for MIMO/Diversity Applications |
| Abstract: | A novel compact, ultrawideband (UWB) monopole antenna with triple band-notched characteristics are presented for MIMO/diversity applications. Triple band-notched function is achieved by inserting two folded v-slot on the radiation patch and two modified mushrooms-like EBG structure above ground plane on either side of feed line. The designed MIMO antenna has a small size compared to the previous similar designs. With the purpose of mutual coupling reduction between antenna elements, two rows of modified mushroom-like EBG structures are inserted to suppress the effect of the surface wave between antenna elements. The MIMO performance of the proposed antenna is studied through mutual coupling (S12), envelope correlation coefficient (ECC) and diversity gain. |
| Author(s): | A. Mousazadeh, GH. Dadashzadeh |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1337 KB |
| Title: | Synthesis Design of Bandpass Filter for UWB Applications with Improved Selectivity |
| Abstract: | This paper presents the design of UWB threepole modified parallel coupled line bandpass filter with improved rejection in the out-of-band frequencies. To achieve the desired UWB requirements using the conventional bandpass filter design, a physical dimension optimization of space-gap between lines, line widths and lengths was applied. An equivalent circuit model is also presented and demonstrates reasonable agreement with simulation results. The optimized filter demonstrates an excellent UWB performance, covering the Federal Communication Commission spectrum bandwidth with low insertion loss and acceptable selectivity. However, this resulting filter structure presents very small gapping between adjacent resonators; that means the filter is unmanufactured. Then an example of an alternative filter structure is finally proposed with null gaping and shortcircuited stubs that yields to a fabricated prototype with selectivity improvement. Generally speaking, reasonable agreement is achieved between measurement and simulation results. |
| Author(s): | A. Naghar, O. Aghzout, A. V. Alejos, F. Falcone |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 584 KB |
| Title: | A Compact UWB Slot Antenna with Reconfigurable Band-Notched Function for Multimode Applications |
| Abstract: | A novel design of printed slot antenna with multiresonance and switchable band-notched performances is presented whose frequency characteristics can be reconfigured electronically to have both a single- or dual-band notch function. The presented antenna is reconfigurable to suppress unwanted interfering signals by using PIN diodes integrated within the antenna configuration. The presented antenna consists of square radiating stub with a pair of rotated ?-shaped slits, feed-line with an inverted U-shaped slot, and a slotted ground plane. By cutting an inverted U-shaped slot at the feed-line we can gave a new resonance at the higher frequencies that with this structure, an UWB frequency range can be achieved. In the presented antenna, we use two PIN diodes across the ?-shaped structures that by changing the ON/OFF conditions of the PIN diodes, the antenna can be used for multimode applications. In the proposed structure, when D1&D2=OFF, the UWB antenna with a single band-notched characteristic can be achieved. By changing the condition of integrated diodes to D1&D2=ON, the pair of rotated ?-shaped slits at radiating stub have been converted to four L-shaped slits that with this design the antenna can be used to generate a dual band-notched function to isolate and block any interference in the UWB frequency range. |
| Author(s): | A. Musavand, Y. Zehforoosh, H. Ojaroudi, N. Ojaroudi |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 701 KB |
| Title: | Switchable Multiband Monopole CRLH Antenna |
| Abstract: | In this paper, a switchable multiband monopole composite right/left-handed (CRLH) antenna is designed, fabricated and measured. The structure consists of a monopole loaded with three CRLH unit cells. By incorporating the three unit cells it aids in generating multiband frequencies. The switchable antenna is developed by placing the pin diodes which enables the simultaneous operation of unit cells. A detailed parametric study is done to investigate the influence and the effect of CRLH cells dimensions. The simulation and measured results are in good agreement. The results show multiple bands from 1-4 GHz. The measured maximum gain of antenna is 3.13 dBi. |
| Author(s): | A. K. Alqallaf, R. K. Dib, M. F. Karim |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1136 KB |
| Title: | A New Dual-Band, Dual-Polarized and Single Feed Reconfigurable Antenna |
| Abstract: | In this paper, a new single feed reconfigurable annular-ring slot antenna for polarization and frequency diversity for WLAN and WiMAX applications is proposed. This antenna has a simple structure; it contains two concentric circular slots, and four tuning stubs on one side of the substrate, and a 50 ? microstrip feed line and two stubs on the other side. The proposed antenna can be switched between two resonant frequencies, 2.4 GHz (WLAN) and 3.5 GHz (WiMAX). Furthermore, it can be switched between left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP) at both resonant frequencies. Using seven switches (PIN diode), on both sides of the substrate. Details of the antenna design are shown and the results are also exhibited and discussed. Simulation and experimental results indicate that the proposed antenna demonstrates a good impedance bandwidth at the two resonant frequencies, and satisfactory axial ratios in the circularly polarized states. |
| Author(s): | A. Sedghara, Z. Atlasbaf |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 731 KB |
| Title: | Additional Losses in Ultra-Wide Band Reflector Systems |
| Abstract: | The increasing demand of ultra-wide band (UWB) antennas in reflector systems, especially for radioastronomy, necessitates the analysis of reflector losses for directive UWB feeds. UWB technology has significant advantages; however its usage in reflector systems brings some extra losses to be considered. Ideally, all areas of the reflector should be illuminated with equal energy from the feed antenna at all frequencies of the band. However, this is not possible for a wide band system. Different phase center locations and 10 dB beamwidth values at different frequencies within the band result in spillover, amplitude taper and phase losses in a reflector system. These losses should be analyzed in detail for the effectively working of the system. The purpose of this work is to discuss the additional losses that occur in a UWB reflector system and demonstrate these losses with a given example. A directive Vivaldi antenna is used as the feed antenna of the UWB reflector and the effect of the losses on the directivity is shown. |
| Author(s): | H. Kara, N. T. Tokan |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 795 KB |
| Title: | Dual-Band 4-Way Wilkinson Power Divider Based on Improved Simplified Composite Right and Left Handed Transmission Lines |
| Abstract: | In this paper, by using improved simplified composite right and left handed transmission lines (I-S-CRLH-TL), a novel 4-way parallel Wilkinson power divider (WPD) is presented. The proposed WPD exhibits the benefits of excellent isolation and equal power split between output ports in the dual frequency band. Also, the dual-band nature of this divider, low cost and easy integration with printed circuits and printed antennas in a compact size makes this device a very good candidate for feeding dual-band antennas and microwave devices. The proposed divider is designed and fabricated on a low cost substrate with permittivity of 4.4 and thickness of 0.79 mm to work at two arbitrary frequency bands of 0.95 GHz and 2.43 GHz. There is a good agreement between simulated and measured results in all cases. The design concept of this paper can be easily extended to another type of dual-band microwave components. |
| Author(s): | H. Younesiraad, M. Bemani |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 614 KB |
| Title: | Using Folded Open-Loop Ring Resonator to Design a Common-Mode Suppression and Frequency Adjustable Balun-Bandpass Filter |
| Abstract: | A compact and simple balun-bandpass filter was investigated by using a pair of half-wavelength open-loop ring resonators (OLRRs) and two microstrip lines. The balun-bandpass filter could be designed easily with a different center frequency by changing the path length of OLLRRs. The design methodology was adopted based on EM simulation to obtain these optimally designed parameters of the OLRRs, and microstrip lines and the filters were fabricated on FR4 substrate. The filters with the frequencies of 2.6 GHz and 5.2 GHz were designed to prove the characteristic of frequency adjustable and they were fabricated with the properties of wide bandwidth and low insertion loss. The balun-bandpass filters presented an excellent inband balanced performance with common-mode rejection ratio over than 40 dB and 34 dB in the passbands of 2.6 GHz and 5.2 GHz, respectively. Good correlation was seen between simulation and measurement, and the result showed that first run pass had been achieved in the majority of our design. |
| Author(s): | C.-M. Chen, S.-J. Chang, J.-C. Zheng, J.-C. Liou, C.-F. Yang |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 691 KB |
| Title: | Design of High Performance Miniaturized Lowpass Filter Using New Approach of Modeling |
| Abstract: | In this paper a compact microstrip lowpass filter (LPF) is presented using the taper-loaded resonator. Based on a new approach, the resonator response as a function of its model component is obtained. The proposed equation between the insertion loss and LC parameters of the resonator, enable designers to calculate the proper amount of these parameters for a considered response, through the mathematical equations. The response of the final filter is improved using H-shape and spiral-shape defected ground structure. This filter is designed, fabricated and measured and as it is shown in the simulation results, the cutoff frequency is 1.53 GHz, the roll-off rate is better than 29.3 dB/GHz and the insertion loss is less than 0.1 dB from DC to 1.1 GHz. |
| Author(s): | S. Majidifar |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 335 KB |
| Title: | Electromagnetic Modeling of Electronic Device by Electrical Circuit Parameters |
| Abstract: | This article proposes an electric model to determine the values of the electric fields of an electronic device. When applying the method, the integrated circuit device will be modeled on the resistance, inductance and capacitance values (R, L, C parameters) provided by the IBIS (Input/Output Buffer Information Specification), also considering the internal activity of the integrated circuit. The electric parameters of the printed circuit board tracks will be extracted by software based on the moments method and fast multipole method. Simulations of the electric model are performed in the time and frequency domain by the Fourier transform, and from the obtained harmonics, the values of the electric fields are calculated with software based on the finite elements method. Measurements were performed in order to validate the simulations. |
| Author(s): | D. De Moura, A. Raizer |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 876 KB |
| Title: | Uncertainty Analysis in EMC Simulation Based on Improved Method of Moments |
| Abstract: | Recently, many uncertainty analysis methods have been taken into consideration in electromagnetic compatibility (EMC) simulation. As a traditional method, the Method of Moments (MoM) owns many advantages compared with other methods, especially in calculating the high dimension problems. However, its main disadvantage is the poor accuracy. In this paper, the Richardson extrapolation has been used to improve the MoM in order to promote the accuracy. By using feature selective validation (FSV), the effectiveness of the improvement can be obviously shown compared with the standard results calculated by the Monte Carlo Method (MC). |
| Author(s): | J. Bai, G. Zhang, L. Wang, T. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 321 KB |
| Title: | An Algorithm for Calculating Transient Magnetic Field and Induced Voltage Inside Wind Turbine Tower Under Lightning Strike |
| Abstract: | This paper proposes an efficient algorithm for predicting the transient magnetic field and induced voltage inside wind turbine tower under lightning stroke. The continuous tower body is simplified as a discrete multiconductor system consisting of longitudinal and transverse branches. On the basis of the lightning current responses in the multiconductor system, the analytic formulas of the transient magnetic field are derived from the vector potential. These formulas can take account of the impact of the wavefront steepness of lightning current on the transient magnetic field. A discretization scheme is further presented to calculate the magnetic flux passing through a conductor loop. The induced voltage can be determined by finding the time rate of change of the magnetic flux. The results obtained from the proposed algorithm are also compared with those from the software Ansoft and circuit method. |
| Author(s): | Z. Xiaoqing, Z. Yongzheng |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 937 KB |
| Title: | Comparison of Evolutionary Algorithms for Optimal Design of Broadband Multilayer Microwave Absorber for Normal and Oblique Incidence |
| Abstract: | Microwave absorbers have emerged as an indispensable industrial apparatus in today’s world, owing to their multitude of uses, both civil as well as military. This paper focuses on the use of three evolutionary algorithms, namely, particle swarm optimization, bat algorithm and cuckoo search algorithm for the purpose of obtaining optimal designs of seven layer microwave absorbers over a wide frequency range, and both cases of normal and oblique incidence. The resultant optimal designs are compared in terms of maximum reflection coefficient and total thickness with those presented in existing literature. |
| Author(s): | S. Roy, A. Mahanti, S. D. Roy, G. K. Mahanti |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 543 KB |
| Title: | A Study on Different Topologies of the Tubular Linear Permanent Magnet Motor Designed for Linear Reciprocating Compressor Applications |
| Abstract: | This paper presents a study on three different topologies of tubular linear permanent magnet motors (TLPMMs), with different permanent magnet (PM) structures. These motors provide direct conversion for electrical energy into a linear mechanical force, and they are directly coupled to the load. The proposed motors are equipped with quasi-Halbach magnetized moving-magnet armatures and their stator cores have been made from a soft magnetic composite (SMC) material, Somaloy 700. Based on the nonlinear time-stepping two-dimensional finite-element analysis (2-D FEA) an extensive magnetic field analysis of the proposed designs has been established. The simulation results indicate the effectiveness of the designs to drive a linear reciprocating compressor in a household refrigerator. Moreover, the simulation results have shown that, the superiority of the two designs with T-shaped and trapezoidal-shaped PMs structures over the TLPMM with conventional rectangular-shaped PMs. In addition to that, the usage of quasi-Halbach for the PMs array arrangement has a significant effect on the motor performance. |
| Author(s): | I. I. Abdalla, T. B. Ibrahim, N. M. Nor |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 513 KB |
| Title: | Measurement of Complex Permittivity of Polystyrene Composite at 11.64 GHz Using Cavity Perturbation Technique |
| Abstract: | Complex permittivity of polystyrene composites of different percentage of carbon black fillers are measured over the wide frequency range 8-12 GHz using X-band rectangular cavity resonator. The measurement technique uses the cavity perturbation technique. Validity of present measurement technique has been checked by measuring the dielectric properties of wellknown dielectric materials (Teflon and Rexolite). Polystyrene composites are very useful for lightweight shielding and absorbing materials. It would be of great interest for the community to find its dielectric properties over wider frequency range. Due to lack of experimental data on dielectric parameters of carbon black composite in literature, the experimental study has been conducted to measure the dielectric properties of polystyrene composite over wide frequency range of X-band (8-12 GHz). In addition, the estimation of measurement error associated with this technique is also discussed. |
| Author(s): | S. Sharma, D. Kaur |
| File Type: | Journal Paper |
| Issue: | Volume: 31 Number: 1 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 349 KB |