ACES Publication Search
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| Title: | ACES Journal March 2019 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 3923 KB |
| Title: | ACES Journal March 2019 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 843 KB |
| Title: | ACES Journal March 2019 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 16800 KB |
| Title: | Dual-Band and Dual-Polarized Electrically Tunable Reconfigurable Reflectarray Antenna |
| Abstract: | In this paper, a dual-band and dual-polarized electrically tunable reconfigurable reflectarray antenna (RRA) is proposed, fabricated and measured for the beam-scanning performance. The RRA element, a single layer structure with two split-rings and a pair of varactor diodes, can be electrically tuned to work at the two orthogonal polarization modes of the incident electric field at 4.2GHz and 6.5GHz, respectively. Besides, the range of the phase compensation of the element is over 300° at the two polarization modes. Then, a RRA with 15×15 elements is designed, fabricated and measured to prove the validity. The main beam direction can be controlled by tuning these varactor diodes of the RRA and the beam-scanning range is from -60° to 60°. The experimental results and simulation results are in good agreement to prove the correctness and feasibility of the design of the novel dual-band and dual-polarized electrically tunable RRA. |
| Author(s): | S. Tian, H. Liu, L. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1417 KB |
| Title: | Gain-Enhanced Compact Circularly Polarized Array Microstrip Antenna |
| Abstract: | A miniaturized circularly polarized microstrip antenna array with sequential-phase (SP) feed is presented. Attributed to the slotted metal walls surrounding the SP feed and the internally slotted patch array with parasitic rectangular patches, the key performance indicators of antennas are greatly improved, such as gain and impedance bandwidth. The numerical results of designed antenna simulated by ANSYS HFSS show that the impedance bandwidth is about 11.89% (5.41-6.09GHz) for the S11 = -10 dB matching criterion, the 3-dB Axial Ratio (AR) bandwidth is about 13.26% (5.64-6.44GHz), and the peak gain can reach to 11.86 dBi at 6.09GHz. When the center frequency of proposed antenna is operated at 5.87GHz, the available bandwidth is 7.71% (5.64-6.09GHz). Based on this, the AR bandwidth is about 450MHz. |
| Author(s): | Z. Jiang, H. Zhao, X. Zhao, J. Liu, M. Shui, T. Wan, X. Qiao |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1831 KB |
| Title: | Mutual Coupling Reduction of a Dual-Band Antenna Array Using Dual-Frequency Metamaterial Structure |
| Abstract: | Dual-band antenna is an enabling component for wireless local area network (WLAN) communication systems. One of the challenges for improving the communication quality in dual-band multiple-input multiple-output (MIMO) system is to develop low coupling MIMO antenna array with compact size. In this paper, an isolation enhanced two-element MIMO antenna array with dual-frequency decoupling structure is proposed for operating at the upper and lower WLAN bands. The proposed dual-frequency decoupling structure is realized by an array of two columns of metamaterial structures with unique electromagnetic resonance characteristic. The property of the designed metamaterial array is analyzed and integrated between the elements of a two-element patch antenna array to reduce the mutual coupling. The performance of the dual-frequency patch antenna array is verified by the simulation and measurement, respectively. The experimental results show that the proposed dual-frequency MIMO antenna array has an isolation enhancement about 15dB at 2.4GHz and 9dB at 5.25GHz, respectively. Moreover, the proposed dual-band MIMO antenna has a smaller size and good directional radiation patterns, making it promising for WLAN applications. |
| Author(s): | S. Luo, Y. Li, Y. Xia, G. Yang, L. Sun, L. Zhao |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2049 KB |
| Title: | A Low Mutual Coupling Antenna Array with Gain Enhancement Using Metamaterial Loading and Neutralization Line Structure |
| Abstract: | A MIMO antenna array with high isolation and gain enhancement operating at 5.7 GHz is proposed by using a metamaterial and neutralization line for wireless local area network (WLAN) communication system. A suspended meta-surface consisted of periodic metamaterial cells is installed on the top of the MIMO antenna array to realize a gain enhancement, while the low correlation is implemented by using the neutralization line decoupling structure which is adopted on the feeding lines. The proposed MIMO array is modeled in the HFSS, and it is well analyzed, optimized, fabricated, and measured to discuss its performance. The obtained results demonstrate that the proposed MIMO antenna array can cover the upper WLAN band with a gain enhancement of 3dB and mutual decoupling of 30dB in the operating band with an efficiency of 68%. |
| Author(s): | S. Luo, Y. Li, Y. Xia, L. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2100 KB |
| Title: | Improved Constraint NLMS Algorithm for Sparse Adaptive Array Beamforming Control Applications |
| Abstract: | In this paper, a new reweighted l1-norm and an lp-norm based normalized least mean square (NLMS) algorithms are developed for sparse adaptive array beamforming control applications. The proposed reweighted l1-norm constrained NLMS (RL1-CNLMS) and lp-norm constrained NLMS (LP-CNLMS) algorithms use the l1-norm penalty and lp-norm penalty to the conventional cost function of constrained normalized LMS (CLMS) algorithm to control the sparsity of the antenna array. What’s more, in the derivation process, the gradient descent principle and Lagrange multiplier method are adopted to obtain the desired updating formulations. Computer simulations demonstrate that the superiority of proposed algorithms compared with other LMS based beamforming methods. |
| Author(s): | W. Shi, Y. Li, J. Yin |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1832 KB |
| Title: | Accurate Analysis of JEM Interference in Airborne Array using Parallel HO-IE-DDM |
| Abstract: | In this paper, we present a parallel integral equation solver based on domain decomposition method for the analysis of airborne array interference problems affected by jet engine modulation. The solver makes use of higher-order basis functions for the discretization of the problem. The paper proposes two main novelties: firstly, the radiation characteristics of the airborne array (interfered by multiple rotating blades) are analyzed using an integrated simulation technology; secondly, the computation during the analysis of JEM problem is significantly reduced, for only re-computing the changed parts of the model. Numerical examples using complex electrically large structures are presented in order to demonstrate the flexibility, accuracy, and efficiency of the proposed integral equation solver. |
| Author(s): | Y. Liu, Q. Su, X. Zhao, Y. Zhang, Z. Lin, C. Zhai, Q. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 3395 KB |
| Title: | Direction Finding Using Uniform Circular Array of Horizontal Log-Periodic Dipole Antennas |
| Abstract: | Direction finding (DF) using the uniform circular array composed of horizontal log-periodic dipole antennas (UCA-LPDA) is studied in this paper. One advantage of the UCA-LPDA is that it has a reasonable effective radius for broadband DF. Compared with the previous works which usually focused on isotropic antennas, the UCA-LPDA has higher gain and higher angular resolution for the direction of arrival estimation. The spatial response of the UCA-LPDA and the direction of arrival (DOA) estimation algorithms are discussed. The proposed polarized MUSIC (Pol-MUSIC) method can obtain the DOA of signals with any unknown polarizations while no search of the polarizations is required. Based on the theoretical analysis, the actual signal DF experiment which uses a UCA-LPDA with 24 elements was carried out. The DF experiments results demonstrate the effectiveness and accuracy of using UCA-LPDA with Pol-MUSIC method. |
| Author(s): | X. Ren, S. Zhang, H. Li, S. Gong |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 2012 KB |
| Title: | On the Approximate Calculation of Half-Power Beam Width for Uniform Circular Arrays |
| Abstract: | In this paper, the approximate calculations of the half-power beam width (HPBW) of a uniform circular array (UCA) in azimuth and elevation are investigated by numerical calculations and data analysis methodology. Two corresponding formulas are proposed to approximately estimate the HPBW of UCA in azimuth and elevation under different pointing directions of the main lobe. The proposed formulas’ validities are examined by comparing the results with the ones directly calculated from the array factor. Besides, the accuracies of the proposed approximate formulas are evaluated in both absolute error and error rate. The calculation speed is assessed in time as well. Numerical simulation results are provided to show the proposed formulas’ performances. |
| Author(s): | H. Tang, X. Zong, Z. Nie |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1787 KB |
| Title: | Dual-polarized Grid-slotted Microstrip Antenna with Enhanced Bandwidth and Low Profile |
| Abstract: | In this paper, a wideband dual-polarized microstrip antenna is proposed inspired by the concept of the periodic grid-slotted surface. Inherited the merit of low profile from microstrip antenna, a relatively wide bandwidth, i.e., up to 43% with reflection coefficient less than -10 dB, is achieved for both orthogonal polarizations. Multiple modes are excited due to the periodic slotloaded structure and well matched using crossed aperture-coupled Y-shaped feeding. The overall height of the proposed antenna is only 0.06 lambda0, lambda0 is the freespace wavelength at the centre frequency of 5.5 GHz. The proposed antenna is systematically studied in the numerical simulation and experiment, and results agree well. The proposed dual-polarized antenna provides an effective choice for wideband low profile antenna for the applications of base station. |
| Author(s): | W. Sun, Y. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1991 KB |
| Title: | Mm-wave Radar Based Micro-Deformation Monitoring for Highway and Freight Railway Bridges |
| Abstract: | In this paper, a mm-wave radar is devised to monitor the micro-deformation of bridges and its performance is verified via monitoring a highway and a freight railway bridges. The radar interferometry technology is utilized to develop the compact and portable mm-wave radar. Experiments are set up to monitor a highway bridge around Beijing-Tianjin expressway which is near the sixth ring roads of Beijing and a Daqin freight railway bridge in Yanqing, Beijing. The experimental results demonstrate that the devised radar can detect the micro-deformation of the bridge vibration with a super-resolution and high precision, making the mm-wave radar promising for bridge monitoring, dam monitoring, debris flow monitoring applications. |
| Author(s): | Y. Li, Z. Shao, X. Zhang, J. Jiang |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1558 KB |
| Title: | Ungrounded Lightning Surge Protection Device for Wireless Sensor Networks Node in the Wilderness |
| Abstract: | In the wilderness, the use of wireless sensor network (WSN) nodes because of their maintenance-free remote-monitoring characteristic demands ungrounded lightning surge protection. This paper proposes a design of a protection device with functions of low-frequency surge cutting off and radio-frequency (RF) signal passing. In this device, the discharge circuit consists of a threelevel surge by-pass circuit, an outer conductor antenna, and a copper-clad circuit board. The current capacity, start time, and output voltage meet the requirements of surge protection for a weak current device. Discrete components that provide the protective feature were involved in calculating impedance matching, and the parameters of these components were estimated and adjusted constantly at the test stage to ensure that the impedance of the inserted protection device matches with those of the node RF transceiver module and antenna. The experimental results show that the node with the ungrounded protection device can pass fourth-level surge immunity experiments and run for 49 months at the outdoor monitoring site in the Xinjiang coal fire area. |
| Author(s): | Q. Cao, L. Yang, S. Yan |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1412 KB |
| Title: | High Selectivity Bandpass Filter Using Three Pairs of Coupled Lines Loaded with Shorted Stubs |
| Abstract: | A high selectivity bandpass filter with multiple transmission poles (TPs) and transmission zeros (TZs) has been presented. By employing three pairs of parallel-coupled lines and two shorted stubs, sharp rolloff skirts and high stopband rejections can be achieved with five TPs and ten TZs. Theoretical analysis is explained and simulated results are illustrated on this high-performance filter. Finally, a bandpass filter example with center frequency of 2.15 GHz and 3-dB fractional bandwidth of 19% is designed, fabricated, and measured. It is shown that the measured transition band roll-off rates are better than 425 dB/GHz. Good agreement between the simulations and measurements validates the design method. |
| Author(s): | K.-D. Xu, F. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1667 KB |
| Title: | Three-Dimensional Spherical-Shaped UPML for FDTD with Cubic Lattices |
| Abstract: | Spherical-shaped uniaxial perfectly matched layer (SS-UPML), an absorbing boundary for threedimensional (3-D) finite-difference time-domain (FDTD) method with cubic cells, is proposed and applied to different objects. This boundary is used for truncating the computational domain to absorb outgoing electromagnetic waves, which has the advantages of higher efficiency and accuracy, compared with the conventional UPML. Update equations are transformed by coordinate rotation to better fit the Cartesian system. Different numerical experiments are implemented to verify the stability and practicability of the proposed boundary in 3-D case. Obtained results illustrate that about a half grid and computational time can be saved after SS-UPML is used, which is the foundation of a wider range of applications. |
| Author(s): | L. Wang, M. Wang, K. Zhang, W. Cui, H. Zheng, E. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1952 KB |
| Title: | Double-layer Metal Wire Based Artificial Electromagnetic Surface and its Application to Bessel Beam Microwave Lens |
| Abstract: | In this paper, a transmissive periodic metasurface based on double-layer metal wire structure is designed by combining gradient phase theory with Pancharatnam-Berry (P-B) phase theory to control scattering phase of electromagnetic wave. The proposed artificial electromagnetic medium lens can improve the cross-polarized wave conversion efficiency of the phase discontinuous metasurface and ensure the thickness of the lens is ultrathin relative to the working wavelength. |
| Author(s): | H. Yu, G.-H. Yang, K. Zhang, F.-Y. Meng, Y. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1767 KB |
| Title: | A Novel Query Tree Anti-collision Algorithm for RFID |
| Abstract: | In order to further decrease the probability of the collision and reduce communication complexity, a new low complexity anti-collision algorithm for RFID is proposed using Query Tree. The proposed algorithm can reduce the probability of collision and the traffic of data communication by using tag grouping and setting rules, respectively. The simulation results show that the proposed scheme consumes fewer slots and has lower communication complexity. |
| Author(s): | F. Yang, L. Zhao, H. Chen, S. Hao |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1399 KB |
| Title: | Design and Evaluation of Typical Antennas for Monitoring Vital Signs |
| Abstract: | Non-contact method to monitor vital signs using radar-based sensor system is a more convenient way in comparison with the contact monitoring devices. Portable with a low profile and low-cost non-contact vital signs sensors system that are capable to monitor heart and respiration rates are presented and evaluated their performances. A printed 2x1 patch array antenna, Yagi-Uda antenna and dipole array antenna are designed and integrated with sensor system Tx/Rx module for their performances analysis. The gain of the designed antennas are 6.38 dBi, 7.7 dBi, and 10.5 dBi, VSWR are 1.1, 1.15, and 1.0, and return loss are -26.26 dB, -22.7 dB and -21.6 dB respectively at 2.4 GHz. The evaluations performances of these antennas were compared with a standard respiratory-rate measurement using a pulse sensor and respiratory sensor. The measurement results using the proposed non-contact sensor systems and the standard contact systems showed excellent performance with the printed dipole array antenna compared with other two antennas, the error between the average heart rate extracted by the non-contact systems and the reference systems are ±1.1 beat/min for dipole array antenna, ±1.5 beat/min for printed 2x1 patch array antenna and ±1.9 beat/min for Yagi-Uda antenna. |
| Author(s): | R. S. Mpanda, L. Qi, Q. Liang, L. Xu, J. Shi, L. Zhao |
| File Type: | Journal Paper |
| Issue: | Volume: 34 Number: 3 Year: 2019 |
| Download Link: | Click here to download PDF File Size: 1780 KB |