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A novel wideband ring antenna for polarization/pattern diversity Correspondence
Li SUN, Shigang ZHOU, Guanxi ZHANG, Baohua SUN
Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 6, Pages 975-983 doi: 10.1631/FITEE.2100421
We present a novel wideband ring antenna for polarization/pattern diversity. The proposed antenna consists of eight printed dipole elements in the form of a circular array. The arms of adjacent elements overlap for capacitive loading. Unlike traditional circular arrays, a method of exciting elements in the form of every two intervals is first introduced. We prove that this method can maintain the wideband characteristics of the antenna. Four independent feeding ports in a ring antenna aperture are designed for the polarization/pattern diversity with suitable feeding networks. As an example, a wideband dual-polarized antenna was designed based on the proposed ring antenna. To achieve two orthogonal linear polarizations with maximum radiation in the direction, two adjacent elements are extracted periodically to feed through one port. The differential feeding network and integrated Baluns have been designed to realize broadside radiation patterns, considering impedance and phase matching. Because the proposed antenna is hollow, it is a good candidate for a multiband sharing aperture antenna element. Results show that the proposed antenna has an overlapped bandwidth of 50.5% (1.04–1.82 GHz) with voltage standing wave ratio (VSWR)<2 for the two polarizations, and port isolation less than 23 dB. The measured realized gain ranges from 6.1 to 8.1 dBi, with stable broadside radiation patterns over the operating frequency band.
Keywords: 环形天线;宽带天线;极化分集;方向图分集
Pattern reconfigurable antenna array for 5.8 GHz WBAN applications
杨凌升,王斌,李雅洁
Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 9, Pages 1357-1365 doi: 10.1631/FITEE.2200542
The Optimization of the Monopulse Antenna Based on Genetic Algorithms
Wang Hongjian,Gao Benqing,Liu Ruixiang
Strategic Study of CAE 2002, Volume 4, Issue 5, Pages 84-87
The sum and difference patterns as well as the directivity of the monopulse antenna arrays are optimized based on genetic algorithms (GA). When only the sum pattern is optimized as usual, the difference pattern and gain can not be guaranteed, so the track precision and effective distance of the antenna or missile will be impaired. However, using GA, the sum pattern, difference pattern and directivity can be optimized thoroughly for the antenna design.
Keywords: monopulse antenna array genetic algorithm pattern directivity
Qiang LAN, Lin-bo QIAO, Yi-jie WANG
Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 6, Pages 755-762 doi: 10.1631/FITEE.1601771
Keywords: Stochastic optimization Graph-guided minimization Extra-gradient method Fused logistic regression Graph-guided regularized logistic regression
Dot-shaped beamforming analysis of subarray-based sin-FDA Research Article
Bo Wang, Jun-wei Xie, Jing Zhang, Jia-ang Ge,wb_wangbo1991@163.com
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 10, Pages 1429-1444 doi: 10.1631/FITEE.1800722
Keywords: 频率分集阵列;子阵频率分集阵列;解耦;点状波束形成
Deceptive jamming discrimination based on range-anglelocalization of a frequency diverse array Article
Zhao-jian ZHANG, Jun-wei XIE, Chuan SHENG, Zhun TANG
Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 9, Pages 1437-1446 doi: 10.1631/FITEE.1601577
Keywords: Frequency diverse array (FDA) Deceptive jamming Range-angle coupling Sum-difference beam Double-pulse
Omnidirectional Antenna Diversity System for High-Speed Onboard Communication Article
Yongjian Zhang, Yue Li, Weiquan Zhang, Zhijun Zhang, Zhenghe Feng
Engineering 2022, Volume 11, Issue 4, Pages 72-79 doi: 10.1016/j.eng.2020.10.014
In this article, an omnidirectional dual-polarized antenna with synergetic electromagnetic and aerodynamic properties is propounded for high-speed diversity systems. The propounded antenna comprises a probe-fed cavity for horizontally polarized radiation and a microstrip-fed slot for vertical polarization. Double-layer metasurfaces are properly designed as artificial magnetic conductor boundaries with direct metal-mountable onboard installation and compact sizes. An attached wedge-shaped block is utilized for windage reduction in hydrodynamics. The propounded antenna is fabricated for design verification, and the experimental results agree well with the simulated ones. For vertical polarization, the operating bandwidth is in the range of 2.37–2.55 GHz, and the realized gain variation in the azimuthal radiation pattern is 3.67 decibels (dB). While an impedance bandwidth in the range of 2.45–2.47 GHz and a gain variation of 3.71 dB are also achieved for horizontal polarization. A port isolation more than 33 dB is obtained in a compact volume of 0.247λ0 × 0.345λ0 × 0.074λ0, where λ0 represents the wavelength in vacuum at the center frequency, wherein the wedge-shaped block is included. The propounded diversity antenna has electromagnetic and aerodynamic merits, and exhibits an excellent potential for high-speed onboard communication.
Keywords: Antenna diversity system Aerodynamics Electromagnetics Omnidirectional radiation High-speed onboard communication
Gopi RAM, Durbadal MANDAL, Sakti Prasad GHOSHAL, Rajib KAR
Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 4, Pages 570-577 doi: 10.1631/FITEE.1500371
Keywords: Patch antenna Linear antenna array Cat swarm optimization (CSO) Side lobe level (SLL)
Large-scale graph processing systems: a survey Review
Ning LIU, Dong-sheng LI, Yi-ming ZHANG, Xiong-lve LI
Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 3, Pages 384-404 doi: 10.1631/FITEE.1900127
Keywords: Graph workloads Graph applications Graph processing systems
Paper evolution graph: multi-view structural retrieval for academic literature None
Dan-ping LIAO, Yun-tao QIAN
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 2, Pages 187-205 doi: 10.1631/FITEE.1700105
Academic literature retrieval concerns about the selection of papers that are most likely to match a user’s information needs. Most of the retrieval systems are limited to list-output models, in which the retrieval results are isolated from each other. In this paper, we aim to uncover the relationships between the retrieval results and propose a method to build structural retrieval results for academic literature, which we call a paper evolution graph (PEG). The PEG describes the evolution of diverse aspects of input queries through several evolution chains of papers. By using the author, citation, and content information, PEGs can uncover various underlying relationships among the papers and present the evolution of articles from multiple viewpoints. Our system supports three types of input queries: keyword query, single-paper query, and two-paper query. The construction of a PEG consists mainly of three steps. First, the papers are soft-clustered into communities via metagraph factorization, during which the topic distribution of each paper is obtained. Second, topically cohesive evolution chains are extracted from the communities that are relevant to the query. Each chain focuses on one aspect of the query. Finally, the extracted chains are combined to generate a PEG, which fully covers all the topics of the query. Experimental results on a real-world dataset demonstrate that the proposed method can construct meaningful PEGs.
Keywords: Paper evolution graph Academic literature retrieval Metagraph factorization Topic coherence
A DNA Computing Model for the Graph Vertex Coloring Problem Based on a Probe Graph Article
Jin Xu, Xiaoli Qiang, Kai Zhang, Cheng Zhang, Jing Yang
Engineering 2018, Volume 4, Issue 1, Pages 61-77 doi: 10.1016/j.eng.2018.02.011
The biggest bottleneck in DNA computing is exponential explosion, in which the DNA molecules used as data in information processing grow exponentially with an increase of problem size. To overcome this bottleneck and improve the processing speed, we propose a DNA computing model to solve the graph vertex coloring problem. The main points of the model are as follows:①The exponential explosion problem is solved by dividing subgraphs, reducing the vertex colors without losing the solutions, and ordering the vertices in subgraphs; and②the bio-operation times are reduced considerably by a designed parallel polymerase chain reaction (PCR) technology that dramatically improves the processing speed. In this article, a 3-colorable graph with 61 vertices is used to illustrate the capability of the DNA computing model. The experiment showed that not only are all the solutions of the graph found, but also more than 99% of false solutions are deleted when the initial solution space is constructed. The powerful computational capability of the model was based on specific reactions among the large number of nanoscale oligonucleotide strands. All these tiny strands are operated by DNA self-assembly and parallel PCR. After thousands of accurate PCR operations, the solutions were found by recognizing, splicing, and assembling. We also prove that the searching capability of this model is up to O(359). By means of an exhaustive search, it would take more than 896 000 years for an electronic computer (5 1014 s1) to achieve this enormous task. This searching capability is the largest among both the electronic and non-electronic computers that have been developed since the DNA computing model was proposed by Adleman’s research group in 2002 (with a searching capability of O(220)).
Keywords: DNA computing Graph vertex coloring problem Polymerase chain reaction
A New Sufficient Conditions and Hamiltonian graphs
Zhao Kewen
Strategic Study of CAE 2003, Volume 5, Issue 11, Pages 61-64
Let G be a simple graph, δ and a be minimum degree and independence number of G, respectively, Faudree et al showed, in 1991, the Hamiltonian result with condition | N(x)∪ N(y) | ≥n-8. In 1993, Chen further considered the Hamiltonian with condition max |d{x) , d(y)| n/2 for each pair of non-adjacent vertices x , y with 1≤|N(x)∩NV(y)|≤a-l. In this paper a sufficient condition for a graph to be Hamiltonian graph is shown and the following result is obtained : let G be a 2-connected graph of order n , if| N(x) U N(y) |≥ n-δ-1 for each pair of non-adjacent vertices x, y with 1≤ | N(x)∩ N(y) |α-1, then G is Hamiltonian or G∈{K(n-1)/2, (n + 1)/2, K2* V3K(n-2)/3},This result generalizes some results in Hamiltonian graphs .
Keywords: Hamiltonian graph neighborhood union conditions minimum degree independence number
Directional relation description and calculation based on Voronoi region in GIS
Li Chengming
Strategic Study of CAE 2013, Volume 15, Issue 5, Pages 25-29
Directional relation is very important in GIS,but because of depending on the size of objects,it is difficult to make a formal description and determination. In this paper on the basis of CDR,a solution using Voronoi Region of MBR is suggested,and the wonderful results have been acquired.
Keywords: directional relation Voronoi Region CDR MBR
An Analysis on the Structure of Transport Technology and Its Future Development
Wang Bolu
Strategic Study of CAE 2002, Volume 4, Issue 10, Pages 79-83
According to different driving powers of transport tools, this article divides the history of transport technology into four basic phases and generally points out that the carrier technology and the road-harbor technology are the basic cells of the system of transport technology, and the contradiction between them is the main reason for the progress of transport technology. Then the article analyzes the internal structure and external relations of a transport technology system. Finally, based on the analysis on contradictions in transport, the reality of contemporary science & technology and social development, this article prospects the four developing directions of contemporary transport technology.
Keywords: transport transport technology development direction
The Method of Calculating the Value of Perfect Information Based on the Influence Diagram
Liu Yanqiong,Chen Yingwu
Strategic Study of CAE 2006, Volume 8, Issue 8, Pages 45-49
The problem of calculating the value of perfect information based on the decision tree is analyzed. Then, the article presents that the value of perfect information could be described by the information arc in the influence diagram. Also, the definition of the Howard canonical form is modified. Last, how to calculate the value of perfect information based on the influence diagram is analyzed systematically.
Keywords: value of perfect information influence diagram Howard canonical form
Title Author Date Type Operation
A novel wideband ring antenna for polarization/pattern diversity
Li SUN, Shigang ZHOU, Guanxi ZHANG, Baohua SUN
Journal Article
The Optimization of the Monopulse Antenna Based on Genetic Algorithms
Wang Hongjian,Gao Benqing,Liu Ruixiang
Journal Article
Stochastic extra-gradient based alternating direction methods for graph-guided regularizedminimization
Qiang LAN, Lin-bo QIAO, Yi-jie WANG
Journal Article
Dot-shaped beamforming analysis of subarray-based sin-FDA
Bo Wang, Jun-wei Xie, Jing Zhang, Jia-ang Ge,wb_wangbo1991@163.com
Journal Article
Deceptive jamming discrimination based on range-anglelocalization of a frequency diverse array
Zhao-jian ZHANG, Jun-wei XIE, Chuan SHENG, Zhun TANG
Journal Article
Omnidirectional Antenna Diversity System for High-Speed Onboard Communication
Yongjian Zhang, Yue Li, Weiquan Zhang, Zhijun Zhang, Zhenghe Feng
Journal Article
Optimal array factor radiation pattern synthesis for linear antenna array using cat swarm optimization: validation by an electromagnetic simulator
Gopi RAM, Durbadal MANDAL, Sakti Prasad GHOSHAL, Rajib KAR
Journal Article
Large-scale graph processing systems: a survey
Ning LIU, Dong-sheng LI, Yi-ming ZHANG, Xiong-lve LI
Journal Article
Paper evolution graph: multi-view structural retrieval for academic literature
Dan-ping LIAO, Yun-tao QIAN
Journal Article
A DNA Computing Model for the Graph Vertex Coloring Problem Based on a Probe Graph
Jin Xu, Xiaoli Qiang, Kai Zhang, Cheng Zhang, Jing Yang
Journal Article
Directional relation description and calculation based on Voronoi region in GIS
Li Chengming
Journal Article
An Analysis on the Structure of Transport Technology and Its Future Development
Wang Bolu
Journal Article