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Title: ACES Journal April 2013
File Type: Journal Paper
Issue:Volume: 28      Number: 4      Year: 2013
Download Link:Click here to download PDF     File Size: 10278 KB

Title: ACES Journal April 2013 Front/Back Matter
File Type: Journal Paper
Issue:Volume: 28      Number: 4      Year: 2013
Download Link:Click here to download PDF     File Size: 621 KB

Title: An Optimized Equivalent Source Modeling for the Evaluation of Time Harmonic Radiated Fields from Electrical Machines and Drives
Abstract: A model for electrical machines useful for radiated electromagnetic field studies in a multi-source environment is proposed. The various aspects of electromagnetic signature are considered. This model was created from a representative rectangular prism carrying a set of unbalanced currents in its branches. The geometry and the currents of the equivalent model were calculated based upon a genetic algorithm-based particle swarm optimization process taking into consideration the actual size and the operating conditions of the drive system being studied. The electric field was chosen as the objective function, which is the main element of the optimization. The simulated results show acceptable accuracy and excellent simulation time as compared to the full 3D FE model of the actual machine. Various types of signature studies of the model were conducted. This included stationary and time analysis in addition to the effect of rotation of the machine. For verification, we utilized two machines in a connected system to study and compare the results with their actual model. The results show satisfactory accuracy. The practical implication of this effort is in the fact that, with this equivalent model, we can evaluate radiation and stray effects for EMC evaluation at the design stage.
Author(s): M. R. Barzegaran, A. Sarikhani, O. A. Mohammed
File Type: Journal Paper
Issue:Volume: 28      Number: 4      Year: 2013
Download Link:Click here to download PDF     File Size: 1194 KB

Title: Design, Full-Wave Analysis, and Near-Field Diagnostics of Reflectarray Antennas
Abstract: This article presents a detailed procedure for design, modeling, full-wave simulation, and near-field diagnostics of reflectarray antennas, through a case study of a Ka-band reflectarray antenna with 437 elements. A comparison between analytical approaches and full-wave simulations for reflectarray radiation analysis is also presented, illustrating the necessity of full-wave approaches for an accurate analysis. Furthermore, the phase shift provided by the phasing elements, in the real reflectarray configuration, is analyzed by using the near-field data from the full-wave simulation. This provides a means to diagnose a designed reflectarray, and identify phasing elements that are not providing the required phase shift. The effectiveness of the diagnostic approach is demonstrated through numerical examples.
Author(s): P. Nayeri, A. Z. Elsherbeni, F. Yang
File Type: Journal Paper
Issue:Volume: 28      Number: 4      Year: 2013
Download Link:Click here to download PDF     File Size: 4336 KB

Title: Efficient Method of Optimizing Reverberation Chamber Using FDTD and Genetic Algorithm Method
Abstract: An efficient method combining the finite-difference time-domain (FDTD) method and genetic algorithm (GA) is proposed for the reverberation chamber (RC) optimization. In this method, the GA is utilized to optimize the parameters of RC model built by the FDTD method, such as the stirrer position and stirrer shape. Since the application of GA in the RC optimization and the RC model is automatically varied along with the optimization process, this method improves the accuracy and efficiency of the RC optimization. In addition, the influence of transmitting antenna position on the field uniformity around the lowest usable frequency is also investigated by this method. This method has been verified by comparing with the experiment results.
Author(s): Y. Z. Cui, G. H. Wei, S. Wang, L. S. Fan
File Type: Journal Paper
Issue:Volume: 28      Number: 4      Year: 2013
Download Link:Click here to download PDF     File Size: 794 KB

Title: Three New Rat-Race Couplers with Defected Microstrip and Ground Structure (DMGS)
Abstract: In this paper, three new types of ratrace ring couplers with defected microstrip and ground structure (DMGS) are presented and one type is fabricated to validate the simulation results. The proposed structures have the advantages of size reduction as well as 3rd harmonic suppression. Embedding the DMGS section increases the slowwave factor (SWF) and as a result the resonant frequency of the coupler decreases, which sets the stage for size reduction. In addition, insertion losses of the 3rd harmonic of the proposed couplers are reduced to 35 dB. After optimizing with genetic algorithm (GA), one type is fabricated. Good agreement between the simulation and measurement results is observed. Simulations are carried out using HFSS 13 and the designed coupler is validated by measurement.
Author(s): Ma. Shirazi, R. Sarraf Shirazi, Gh. Moradi, Mo. Shirazi
File Type: Journal Paper
Issue:Volume: 28      Number: 4      Year: 2013
Download Link:Click here to download PDF     File Size: 888 KB

Title: Printed Prototype of a Wideband S-Shape Microstrip Patch Antenna for Ku/K Band Applications
Abstract: Design and analysis of a printed prototype of an S-shape slotted patch antenna for 16.8 GHz Ku band application is proposed in this paper. The proposed miniaturized S-shape patch antenna has been designed and analyzed by using market available Ansoft high frequency electromagnetic simulator and fabricated on a printed circuit board. The measured -10 db return loss bandwidth ranges from 15.35 GHz to 19.65 GHz (25.59 %) with achieved gain of 6.2 dBi at the resonant frequency 16.8 GHz. A radiation efficiency of 88.2 % and 80 (320-40) 3 dB beam width has been testified. The symmetric and almost steady radiation pattern of the proposed antenna has been made suitable for the frequency range from 15.35 GHz to 19.65 GHz. Furthermore, the current distribution over the radiating patch is examined and a parametric study of the ground plane size has been conducted in this study.
Author(s): M. Habib Ullah, M. T. Islam, J. S. Mandeep
File Type: Journal Paper
Issue:Volume: 28      Number: 4      Year: 2013
Download Link:Click here to download PDF     File Size: 906 KB

Title: Broadband CPW-Fed Circularly Polarized Square Slot Antenna with Arc-Shaped and Inverted-L Grounded Strips
Abstract: This paper presents a new wideband circularly polarized square slot antenna (CPSSA) with a coplanar waveguide (CPW) feed. The proposed antenna is composed of two arc-shaped and inverted-L grounded strips around opposite and mirror corners of the square slot. In this antenna the impedance bandwidth and the axial ratio bandwidth (ARBW) are increased compared to the previous CPSSA structures. For the optimized antenna prototype, the measured 3 dB axial ratio bandwidth is 76 % (3 GHz - 6.7 GHz) and the measured VSWR < 2 impedance bandwidth is as large as 108 % (3 GHz - 10.1 GHz). Throughout this paper, the improvement process of the axial ratio (AR) and S11 properties are presented and discussed in detail.
Author(s): A. Mousazadeh, M. Naser-Moghaddasi, F. Geran, S. Mohammadi, P. Zibadoost
File Type: Journal Paper
Issue:Volume: 28      Number: 4      Year: 2013
Download Link:Click here to download PDF     File Size: 2222 KB

Title: Compact Broadband Printed Monopole Antenna
Abstract: A compact printed monopole antenna for broadband application is presented. The proposed antenna, having a total physical size of 21 6.5 mm consists of a patch fed by a coaxial line and an SMA connector as partial finite ground plane. The modified patch plane with a slot in its feed point helps to increase the impedance bandwidth of the proposed antenna. The optimal design may offer an ultra-wide impedance bandwidth from 2.56 GHz to 20 GHz. A prototype is fabricated and tested. The agreement between the simulated and measured results is quite good.
Author(s): A. Jafargholi
File Type: Journal Paper
Issue:Volume: 28      Number: 4      Year: 2013
Download Link:Click here to download PDF     File Size: 898 KB

Title: A Novel Design of Dual Band-Notched Slot Antenna Using a Pair of ?-Shaped Protruded Strips for UWB Applications
Abstract: In this paper, we present a novel design of dual band-notch printed slot antenna for UWB applications. The antenna consists of a square radiating stub and a ground plane structure with an H-shaped slot and a pair of ?-shaped strips protruded inside rectangular slot, which provides a wide usable fractional bandwidth of more than 145% (2.49 GHz ? 15.73 GHz). In order to increase the impedance bandwidth of the ordinary slot antenna, we use an H-shaped slot in the ground plane, through which an UWB frequency range can be achieved. Additionally, by using a protruded ?-shaped strip in the top edge of the rectangular slot a single frequency band-stop performance can be achieved, also in order to create the second notch frequency, we insert the second protruded ?-shaped strip in the bottom edge of the rectangular slot. Simulated and measured results obtained for this antenna show that the proposed slot antenna offers two notched bands, covering all the 5.2/5.8 GHz WLAN, 3.5/5.5 GHz WiMAX and 4 GHz C-band range. The antenna has a small dimension of 20?20 mm2.
Author(s): M. Ojaroudi, N. Ojaroudi, N. Ghadimi
File Type: Journal Paper
Issue:Volume: 28      Number: 4      Year: 2013
Download Link:Click here to download PDF     File Size: 789 KB

Title: Compact 3-D Multilayer Substrate Integrated Circular and Elliptic Cavities (SICCs and SIECs) Dual-mode Filter with High Selectivity
Abstract: In this paper a multilayer dual-mode complementary filter is developed based on the substrate integrated circular and elliptic cavity (SICC and SIEC). The filter is constructed with a SICC and double SIECs, and each cavity supports two degenerate modes, which can be generated and controlled by the coupling aperture and the slot located between layers. With multilayer topology, the structures can exhibit vertical coupling between vertically stacked dual-mode cavities. It does not only have the good performance, but also reduces the circuit size much more. Moreover, sharp transition characteristic in both the lower side and the upper side demonstrates high selectivity of the filter. Good agreement is obtained between the simulated and measured results of the proposed structure.
Author(s): Z. G. Zhang, Y. Fan, Y. H. Zhang
File Type: Journal Paper
Issue:Volume: 28      Number: 4      Year: 2013
Download Link:Click here to download PDF     File Size: 969 KB

Title: Small Microstrip Low-Pass Filter by using Novel Defected Ground Structure for UWB Applications
Abstract: In this paper, a novel low-pass filter using defected ground structure (DGS) slot with a protruded T-shaped strip inside the slot is presented. The resonant frequency of the slot can be easily controlled by changing the protruded Tshaped strips dimensions, without changing the area taken by the structure. Using this DGS slot, a quasi-elliptic low-pass filter was designed, fabricated, and tested. The experimental results show good agreement with simulation results and demonstrate that excellent stop-band performance could be obtained through the proposed low-pass filter. The filter has a cut-off frequency of about 3.4 GHz.
Author(s): A. Faraghi, M. Azarmanesh, M. Ojaroudi
File Type: Journal Paper
Issue:Volume: 28      Number: 4      Year: 2013
Download Link:Click here to download PDF     File Size: 758 KB

Title: A Novel Dual-Band Microstrip Bandpass Filter Design and Harmonic Suppression
Abstract: This paper proposes a new dualpassband microstrip bandpass filter, which is composed of two asymmetric half-wavelength resonators and four shunt open stubs that provides four transmission zeros. Two short stubs are added to suppress the second harmonic. The relationship of the four transmission zeros and the dimensions of the filter are all provided. The dual-passband microstrip bandpass filter is fabricated with the first passband of 2.4 GHz corresponds to the bandwidth of 0.1 GHz and the second passband of 5.7 GHz corresponds to the bandwidth of 0.25 GHz. The insertion loss of the two passband is less than 1 dB and 3 dB, respectively and the return loss is more than 10 dB. The results of the measured and simulated data agree well.
Author(s): X. Li, J. Zeng
File Type: Journal Paper
Issue:Volume: 28      Number: 4      Year: 2013
Download Link:Click here to download PDF     File Size: 773 KB

Title: Stop-Band Filter using A New Metamaterial Complementary Split Triangle Resonators (CSTRs)
Abstract: In this paper, a compact stop-band microstrip filter based on a new complementary split triangle resonator (CSTRs) is presented. We first describe the structure of the resonator and present its characteristics, which are essentially a simultaneous negative-? and negative-?. Then, we apply the complementary of this structure on a microstrip device. The result gives stop-band filter with high rejection band around the resonance frequency of the CSTRs (3.2GHz). The substrate used is the FR4.
Author(s): M. A. Abaga Abessolo, Y. Diallo, A. Jaoujal, A. El Moussaoui, N. Aknin
File Type: Journal Paper
Issue:Volume: 28      Number: 4      Year: 2013
Download Link:Click here to download PDF     File Size: 840 KB