ACES Publication Search
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| Title: | ACES Journal January 2013 |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 1 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 7105 KB |
| Title: | ACES Journal January 2013 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 1 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 630 KB |
| Title: | Broadband High Efficiency Single-Layer Reflectarray Antenna Based on Spiral Crosses |
| Abstract: | This paper presents the design and analysis of a broadband high gain reflectarray antenna based on a novel radiating element, named spiral cross, that has been investigated showing high performance capabilities. The unit cell and the reflectarray antenna have been analyzed by using a full-wave Moment Method code. The proposed antenna exhibits excellent polarization purity, an aperture efficiency of 43.5 %, and a 25.3% bandwidth for 3-dB gain reduction operating at 20 GHz. |
| Author(s): | A. Tayebi, J. Gómez, J. R. Almagro, F. Cátedra |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 1 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 1080 KB |
| Title: | A Multi-Band/UWB MIMO/Diversity Antenna with an Enhanced Isolation Using Radial Stub Loaded Resonator |
| Abstract: | In this paper a multi-band/Ultra- Wideband (UWB) Multiple Input Multiple Output (MIMO) antenna, which is composed of two identical microstrip fed triple notch band UWB antennas and a Radial Stub Loaded Resonator (RSLR), is proposed and verified numerically and experimentally. The antenna is designed to meet the requirement of multi-band/UWB communication applications. A Defected Microstrip Structure (DMS) Band-Stop Filter (BSF) and an invert ?-shaped slot are employed to design the triple notch band UWB antenna. The resonance characteristics of the DMS-BSF and the band notch functions are presented to realize the proposed triple notch band UWB antenna. The isolation of the multi-band/UWB-MIMO antenna has been enhanced by inserting an RSLR loaded T-shaped stub between two identical triple notch band antennas. Both simulation and measurement results are presented to illustrate the performances of the proposed multi-band/UWB-MIMO antenna. |
| Author(s): | Y. S. Li, W. Li, W. Yu |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 1 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 1949 KB |
| Title: | Ultra-Wideband Bandpass Filter Based on Parallel-Coupled Microstrip Lines and Defected Ground Structure |
| Abstract: | A compact planar microstrip bandpass filter with 3.1 GHz ? 10.6 GHz bandwidth, below 1 dB in-band insertion loss, 0.2 ns ? 0.6 ns group delay and out-of-band rejection level better than - 10 dB is presented for ultra-wideband (UWB) applications. The desired UWB is realized by etching a defected ground structure (DGS) in the ground plane and loading a folded steppedimpedance stub by one of the coupling microstrip lines. This can offer two transmission zeros at lower and upper edges of the passband, which improve the passband selectivity and out-of-band rejection significantly. An equivalent lumped circuit model is introduced; the result of the circuit model fits the EM model well. The simulated and measured results are in good agreement |
| Author(s): | L. Yang, Y. Hongchun, W. Yawei, X. Shaoqiu |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 1 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 1504 KB |
| Title: | Compact Lowpass Filter with Wide Stop-Band using Open Stubs-Loaded Spiral Microstrip Resonant Cell |
| Abstract: | In this paper, a compact lowpass filter using open stubs-loaded spiral compact microstrip resonant cell (OSL-SCMRC) is presented. The proposed resonator is implemented to design the lowpass filter with the wide and high out-of-band rejection in the stop-band region. The lowpass filter has the insertion loss from DC to 5.29 GHz better than -0.1 dB and the return loss better than - 19.3 dB. Moreover, the lowpass filter is shown to suppress the harmonics with -20 dB attenuation level from 6.71 GHz to 16.73 GHz result in a 10.02 GHz rejection band. The proposed resonator has an improved slow-wave factor, low radiation and scattering, with a compact size. The filter is designed, fabricated and measured. There is a good agreement between the measured and the simulated S-parameters. |
| Author(s): | A. Adinehvand, A. Lotfi |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 1 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 1132 KB |
| Title: | A Miniaturized Microstrip Dual-Band Bandpass Filter using Folded UIR for Multimode WLANs |
| Abstract: | A novel microstrip dual-band bandpass filter (BPF) using folded half-wavelength uniform impedance resonator (UIR) with high selectivity is presented. The proposed filter with two tuneable passbands has advantages such as compact size and simple structure. The passband frequencies have been adjusted for 2.4 GHz and 5.2 GHz wireless local area networks (WLANs). The overall size is reduced by 30 % in comparison with the two section radial stepped impedance resonator (SIR). The measured insertion loss is less than 0.18 dB and 0.5 dB in the first and second passbands, respectively. Also the measured return loss is more than 30 dB and 20.73 dB in the first and second passbands, respectively. There is a good agreement between the measured and the simulated results. |
| Author(s): | M. Hayati, A. Khajavi, H. Abdi |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 1 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 1061 KB |
| Title: | A New Model for the FDTD Analysis of Sub-Structures on Infinite Plates |
| Abstract: | In this work, a new model has been proposed for the finite-difference time-domain analysis (FDTD) of sub-structure coupling problems. By stretching the total-field/scatteredfield (TF/SF) boundary and the perfect electric conductor (PEC) plane into the convolution PML (CPML) layers, the coupling of sub-structures loaded on infinite planes induced by plane waves can be simulated. The validity of the proposed model has been approved from the comparison of the results obtained from the proposed model with the analytical and the open region results. The CPML performances of this model are compared in different parameters, furthermore the optimal constructive parameters of the CPML have been chosen for the high-resolution simulation of the proposed model, which can help for development of optimal sub-structure coupling. |
| Author(s): | R. Xiong, B. Chen, Y. F. Mao, Z. Y. Cai |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 1 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 1402 KB |
| Title: | Combination of Asymptotic Phase Basis Functions and Matrix Interpolation Method for Fast Analysis of Monostatic RCS |
| Abstract: | The combination of asymptotic phase basis functions and matrix impedance method is proposed and used for fast computation of monostatic scattering from electrically large object. Since asymptotic phase (AP) basis function can be defined on large patches, less number of unknowns is required than that when using traditional Rao-Wilton-Glisson (RWG) vector basis function. In order to efficiently compute electromagnetic scattering, the flexible general minimal residual (FGMRES) iterative solver is applied to compute the coefficients of the basis functions and the sparse approximate inversion (SAI) preconditioning technique is used to accelerate the iterative solver. However, the impedance matrix varies with incident angles, resulting in significant computation time cost for construction of impedance and SAI preconditioning matrices. This difficulty can be alleviated by using the model-based parameter estimation (MBPE) technique. Both the impedance and SAI preconditioning matrices are interpolated at intermediate angles over a relatively large angular band with rational function interpolation method. Numerical results demonstrate that this method is efficient for monostatic RCS calculation with high accuracy. |
| Author(s): | Y. Zhang, D. Huang, J. Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 1 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 1087 KB |
| Title: | A Novel Compact Planar Spiral-shaped Antenna |
| Abstract: | A novel compact spiral antenna with planar feed structure is presented. The proposed antenna is a two-arm Archimedean spiral antenna, which has similar properties of wideband and circular polarization to traditional one. A remarkable improvement of the proposed antenna is the completely planar feed structure. The whole antenna is compact? its spiral diameter is only 23.2mm and the balun is also small. It has an impedance bandwidth of 67% from 4.5GHz to 9GHz and a 4-dB axial-ratio bandwidth of 46.67% ranging from 4.6 GHz to 7.4 GHz. It can be widely used in wideband planar antenna array and other low profile applications. |
| Author(s): | B. Xiao, L. Zhong, J. S. Hong, S. L. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 1 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 2621 KB |
| Title: | Bandwidth Enhancement of Small Square Monopole Antenna with Dual Band-Notched Characterestics Using H-Ring Slot and Conductor Backed Plane for UWB Applications |
| Abstract: | This article proposes a novel printed monopole antenna for ultra wideband applications with dual band-notch function. The antenna consists of a square radiating patch and a ground plane with H-ring slot and conductor backed plane, which provides a wide usable fractional bandwidth of more than 125% (2.89-13.43 GHz). In order to generate single band-notched characteristic, we use an H-shaped conductor backed plane on the other side of the substrate. By converting this H-shaped conductor backed plane to H-ring form, a dual band-notched function is achieved and also by inserting an H- ring slot in the ground plane, additional resonances are excited and hence much wider impedance bandwidth can be produced, especially at the higher band. The measured results reveal that the presented dual band-notched monopole antenna offers a wide bandwidth with two notched bands, covering all the 5.2/5.8GHz WLAN, 3.5/5.5 GHz WiMAX and 4-GHz C bands. The designed antenna has a small size of 12×18 mm 2 . |
| Author(s): | M. Ojaroudi, N. Ojaroudi, S. A. Mirhashemi |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 1 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 1201 KB |
| Title: | A Compact Printed End-Fire Antenna for Radio Frequency Identification (RFID) Handheld Reader |
| Abstract: | A new compact end-fire linear polarized printed antenna for a handheld radio frequency identification (RFID) reader is proposed for ultra high frequency (UHF) radio frequency identification (RFID) system in North America. The proposed planar end-fire antenna using two meandered dipole drivers, a folded reflector and a rectangular reflector are presented. The new antenna uses low-cost fabrication. The advantage of the end-fire antenna with meander dipole drivers compared to the conventional quasi-Yagi antenna is a reduction in the length of the driver, which allows closer space for RFID reader. the dimension of the antenna is 80? 59 mm2. The antenna has maximum gain of 3.6 dB and VSWR better than 2 around the US RFID bands (902- 928MHz). We describe the antenna structure and present the comparison of simulation results with experimental data. The proposed antenna is fabricated, and measured reflection coefficient, radiation patterns and gain are presented. |
| Author(s): | Y. Sun, G. Wen, P. Wang, Y. Huang, Z. Du |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 1 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 1633 KB |
| Title: | Railway Wheel Detector in the Presence of Eddy Current Brakes |
| Abstract: | In this paper, electromagnetic sensor is considered as a train wheel detector, which is one of the most important signalling systems to determine the clearance or occupancy of a track section. The wheel detector is affected by eddy current brakes and this problem has limited its use. In order to improve the wheel detection accuracy and eliminate the eddy current brake effect, the optimal design of sensors is carried out by means of finite element method. Kriging method is utilized to reduce the computational costs. Additionally, genetic algorithm is used as a multiobjective optimization method to find the optimum orientation. |
| Author(s): | A. Zamani, A. Mirabadi |
| File Type: | Journal Paper |
| Issue: | Volume: 28 Number: 1 Year: 2013 |
| Download Link: | Click here to download PDF File Size: 1078 KB |