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2016 International Conference on Emerging Trends in Communication Technologies (ETCT)最新文献

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Wideband low profile tightly coupled dipole antenna array with an integrated balun 带集成平衡器的宽带低轮廓紧密耦合偶极子天线阵列
A. Awasthi, A. Harish
This paper presents a low profile wideband antenna array of tightly coupled dipole antennas. A slot coupled wideband balun is also integrated into the array. The proposed array is designed to operate in 2 GHz – 3.7 GHz frequency band. A finite array with 7 × 7 elements is simulated to observe the radiation and input impedance performance of the antenna. In the proposed array 64.3% impedance bandwidth is achieved along with the good radiation characteristic throughout the band of interest. The height of the proposed structure is only 0.08 λ at the lowest operating frequency.
本文提出了一种由紧密耦合偶极子天线组成的低轮廓宽带天线阵列。该阵列还集成了一个槽耦合宽带平衡器。该阵列设计工作在2 GHz - 3.7 GHz频段。模拟了一个7 × 7单元的有限阵列,观察了天线的辐射和输入阻抗性能。该阵列具有64.3%的阻抗带宽和良好的辐射特性。在最低工作频率下,该结构的高度仅为0.08 λ。
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引用次数: 2
Research issues in RDF management systems RDF管理系统的研究问题
Tanvi Chawla, Girdhari Singh, E. Pilli, Mahesh Chandra Govil
Resource Description Framework (RDF) and SPARQL are some of the common terms we hear with the Semantic Web. RDF is the de-facto standard for data representation on the Semantic Web. The universal adoption of this standard can be attributed to the fact that it has a flexible model. Due to the widespread adoption of Semantic web, a sudden steep increase in the amount of RDF data has been witnessed. This massive volume of RDF data can't be handled by the traditional Centralized RDF management systems. Thus comes into the picture the need for Distributed RDF data management systems which can distribute this RDF data on a cluster of nodes. So, the bottlenecks of the Centralized RDF systems regarding volume and efficient querying can be overcome. This paper presents a detailed description and comparison of the different Centralized and Distributed RDF data management systems.
资源描述框架(RDF)和SPARQL是我们在语义Web中听到的一些常用术语。RDF是语义Web上数据表示的事实上的标准。该标准的普遍采用可归因于它具有灵活的模型。由于语义网的广泛采用,RDF数据的数量急剧增加。传统的集中式RDF管理系统无法处理如此大量的RDF数据。因此,需要分布式RDF数据管理系统来将RDF数据分布在节点集群上。因此,可以克服集中式RDF系统在容量和高效查询方面的瓶颈。本文对不同的集中式和分布式RDF数据管理系统进行了详细的描述和比较。
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引用次数: 11
Improvement in detection of human life sign signal hidden behind the wall using clutter reduction technique 杂波抑制技术对隐藏在墙后的人类生命信号检测的改进
A. Gaikwad, K. Dongre
Detection of human being life signs from behind the wall is addressed in this paper using step frequency continuous wave (SFCW) based radar system. The major problem in life sign detection is the reflection due to wall which amounts for substantial loss of energy. The remaining energy signal pass through wall and propagated towards human being as target. Finally the weak reflected signal from target reach to the receiving antenna after passing through wall again. To improve the signal strength of the target and hence detection, clutter reduction technique is proposed. It is observed that after application of clutter reduction technique, the microwave radar system can detect human life sign. The performance of Singular Value Decomposition (SVD) based clutter reduction technique is compared with moving average clutter reduction technique. It is observed that SVD technique outperforms moving average technique in removing clutter.
本文研究了基于步进频率连续波(SFCW)的雷达系统对墙后人体生命信号的检测。生命信号检测的主要问题是由于墙壁的反射,造成了大量的能量损失。剩余的能量信号穿过墙壁,作为目标向人传播。最后,微弱的反射信号再次穿过墙壁到达接收天线。为了提高目标的信号强度,提高目标的检测精度,提出了杂波抑制技术。结果表明,在杂波抑制技术的应用下,微波雷达系统能够探测到人体的生命信号。比较了基于奇异值分解(SVD)的杂波抑制技术与移动平均杂波抑制技术的性能。观察到奇异值分解技术在去除杂波方面优于移动平均技术。
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引用次数: 5
Analysis of digital PWM design for Zero Voltage Transition Phase Shifted Full bridge converters for space applications 空间零电压转换移相全桥变换器的数字PWM设计分析
Peter K. Joseph, Bijeev N V, Naveen B Sharma, Vasant Jani
The digital control of Electronic Power Conditioners (EPC) for the space applications is promising. Use of an FPGA for digital control could make improved controllability or flexibility of spacecraft systems from earth station. A high speed ADC, a digital PID controller, a digital PWM generator etc. are the essential components required for implementing digital control in EPCs. This paper unveils a Novel DPWM algorithm for realizing a Zero Voltage Transition (ZVT) Phase Shifted Full bridge (PSFB) topology EPC for space applications. The FPGA implementation has been done using Actel/Microsemi-ProAsic3 programming kit. VHDL programing was done in Microsemi Libero software and simulation/synthesis was done using Modelsim software. The experimental waveforms and simulations are shown to validate the results.
电子电源调节器(EPC)的数字化控制在空间应用中具有广阔的发展前景。利用FPGA进行数字控制可以提高地面站航天器系统的可控性和灵活性。高速ADC、数字PID控制器、数字PWM发生器等是epc实现数字控制的基本组件。本文提出了一种新的DPWM算法,用于实现零电压转换(ZVT)相移全桥(PSFB)拓扑EPC。采用Actel/Microsemi-ProAsic3编程工具包完成FPGA实现。在Microsemi Libero软件中进行VHDL编程,在Modelsim软件中进行仿真/合成。实验波形和仿真结果验证了结果的正确性。
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引用次数: 1
Single gate based different structures of OTFTs: Prospective and challenges 基于不同结构的单栅极OTFTs:展望与挑战
A. Pal, B. Kumar, G. Tripathi
Organic thin film transistor based devices are rapidly emerging technology trend in the area of electronics components design and becoming popular area of research in last decades. This is due to their potential of flexible electronics applications, ease of fabrication and low cost in designing of mainly various flexible electronics devices and circuits. This paper focuses towards the performance analysis of single gate-organic-thin-film transistors (OTFTs) on the basis of various performance parameters that is based on advanced OTFT structures in accord with used organic-semiconductor (OSC) materials in individual layers of OTFT. The OSC materials such as pentacene, P3HT, P3OT and many more are used as active layers in fabrication of OTFTs. The major challenges associated with the available OTFT technology nodes are the enhancement of their performance parameters such as subthreshold slope, on-off current ratio, mobility, voltage swing and noise margin to design and fabricate high speed organic circuits along with high reliability and robustness.
基于有机薄膜晶体管的器件是近几十年来电子元件设计领域迅速兴起的技术趋势和研究热点。这是由于它们的柔性电子应用的潜力,易于制造和低成本的设计主要是各种柔性电子器件和电路。本文重点分析了单栅极有机薄膜晶体管(OTFTs)的性能,分析了基于先进OTFT结构的各种性能参数,这些参数与OTFT各层中使用的有机半导体(OSC)材料相一致。并五苯、P3HT、P3OT等OSC材料被用作otft的活性层。现有OTFT技术节点面临的主要挑战是提高其性能参数,如亚阈值斜率、通断电流比、迁移率、电压摆动和噪声裕度,以设计和制造具有高可靠性和鲁棒性的高速有机电路。
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引用次数: 0
Effect of electrode-thickness on electrical properties of organic-thin-film-transistors 电极厚度对有机薄膜晶体管电性能的影响
A. Pal, B. Kumar, G. Tripathi
In this paper the impact of the source/drain (S/D) electrode on performance parameters of the organic-material based transistor is discussed using the 2-D numerical-device Atlas simulator. Additionally, the performance-parameter and the electrical-characteristics of transistor is evaluated in terms of the drive-current, mobility and current on-off-ratio. Furthermore, thickness of source/drain electrode is varied to analyze the impact on performance parameters of the transistor in the range of infinitesimal-thickness to 40 nm with 10 nm step size in both the configurations, bottom-gate with contact electrodes at bottom and top-configurations. These configurations are also termed as planar and staggered-OTFT configurations, respectively. On the basis of result analysis, it is found that BGBC configuration have lower drive current in comparison to bottom gate top contact configuration because of larger barrier heights. Subsequently, it is also analyze that BGBC configuration has more impact on their performance parameters in comparison to BGTC configuration with variation in electrode thickness. At the outset, it is observe that thickness of source-drain electrodes has the significant impact on the device performance, therefore, due consideration is needed during performance analysis and actual fabrication of the organic material based transistors.
本文利用二维数值器件Atlas模拟器讨论了源极/漏极(S/D)电极对有机材料基晶体管性能参数的影响。此外,还从驱动电流、迁移率和通断比等方面对晶体管的性能参数和电学特性进行了评价。此外,通过改变源极/漏极的厚度,分析了在无限小厚度到40 nm范围内,步长为10 nm的两种配置(底部栅极与底部接触电极和顶部栅极)对晶体管性能参数的影响。这些配置也分别称为平面和交错otft配置。结果分析表明,由于势垒高度较大,BGBC结构比底部栅极顶部触点结构具有更低的驱动电流。随后还分析了随着电极厚度的变化,BGBC结构比BGTC结构对其性能参数的影响更大。首先,我们观察到源极-漏极的厚度对器件的性能有显著的影响,因此,在性能分析和实际制作有机材料基晶体管时需要考虑到这一点。
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引用次数: 0
Performance comparison of single and dual gates organic thin film transistors 单双栅极有机薄膜晶体管的性能比较
Astha Singh, B. Kumar, G. Tripathi
Organic device modeling and application of organic transistors are rapidly emerging area of research now a day. This trend is developing due to various advantages of organic material offers such as fabrication over large area and flexible-electronics at lower-cost and temperature. Considering this fact, this paper presents overview of various OTFT structures. The result-analysis is implemented through industry standard Atlas 2-D-organic-module-simulator for both the devices. The comparison-between single-gate and dual-gate organic transistors is discusses based on various factors such as OTFT structures and thin-film-material-layers. The characteristics of the single-gate and dual-gate-structures is performed as well. Dual-gate-organic transistor is depicts-better-performance in comparison to its counterpart.
有机器件的建模和应用是当今有机晶体管迅速崛起的研究领域。这一趋势的发展是由于有机材料提供的各种优势,如在更大的面积和更低的成本和温度下的柔性电子制造。考虑到这一事实,本文概述了各种OTFT结构。结果分析是通过工业标准的Atlas二维有机模块模拟器实现的。从OTFT结构和薄膜材料层等方面对单门与双门有机晶体管进行了比较。分析了单栅和双栅结构的特点。双栅有机晶体管与同类产品相比,具有更好的性能。
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引用次数: 0
Reconfigurable Bandpass Filter for use of 2.7– 3.1 GHz radar spectrum 用于2.7 - 3.1 GHz雷达频谱的可重构带通滤波器
Jai Utkarsh, R. K. Raj, A. K. Lall, D. K. Upadhyay, G. K. Mishra
A bandwidth reconfigurable Microstrip Bandpass Filter (BPF) for air traffic management and air defense radar system has been presented in this paper. The proposed structure achieves a fractional bandwidth of 3.24% at constant resonance frequency 2.9 GHz with minimum and maximum bandwidth as 366 MHz and 460 MHz respectively. All this is achieved in a compact size of 42.85 × 26.725 mm2.
提出了一种用于空中交通管理和防空雷达系统的带宽可重构微带带通滤波器。该结构在恒共振频率2.9 GHz下的分数带宽为3.24%,最小带宽为366 MHz,最大带宽为460 MHz。所有这些都是在42.85 × 26.725 mm2的紧凑尺寸中实现的。
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引用次数: 1
Dual-band monopole antenna loaded with dual-band AMC for WLAN/WiMAX applications 双频单极天线加载双频AMC用于WLAN/WiMAX应用
Vivek Kumar Pandit, A. Harish
A CPW-fed dual-band monopole antenna loaded with dual-band artificial magnetic conductor (AMC) surface is presented for wireless local area network (WLAN: 2.4/5.2/5.8 GHz) and worldwide interoperability for microwave access (WiMAX: 2.5/5.5 GHz) bands. The proposed dual-band antenna consists of a tapered monopole antenna having two inverted L-shaped slots and has a size of 22 × 33 mm2: A 4 × 4 unit cell dual-band artificial magnetic conductor surface has been used as a reflector for antenna. The size of the antenna with AMC reflector is 68 × 68 mm2. The proposed antenna is fabricated and measured. Experimental result shows that the antenna operates form 2.1–2.87 GHz, 4.86–5.97 GHz which covers 2.4/5.2/5.8 GHz WLAN and 2.5/5.5 GHz WiMAX bands. It has a directional radiation pattern with peak gains of 6.64 dBi, 7.3 dBi and 6.2 dBi at 2.45 GHz, 5.2 GHz and 5.8 GHz respectively.
针对无线局域网(WLAN: 2.4/5.2/5.8 GHz)和微波接入(WiMAX: 2.5/5.5 GHz)频段的全球互操作性,提出了一种负载双频人工磁导体(AMC)表面的cpw馈电双频单极天线。所提出的双频天线由具有两个倒l型槽的锥形单极天线组成,尺寸为22 × 33 mm2;天线的反射面采用4 × 4单元格双频人工磁性导体表面。带AMC反射镜的天线尺寸为68 × 68 mm2。对所提出的天线进行了制作和测量。实验结果表明,该天线工作在2.1-2.87 GHz、4.86-5.97 GHz频段,覆盖2.4/5.2/5.8 GHz WLAN和2.5/5.5 GHz WiMAX频段。它在2.45 GHz、5.2 GHz和5.8 GHz频段的定向辐射方向图,峰值增益分别为6.64 dBi、7.3 dBi和6.2 dBi。
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引用次数: 10
Enhancing concealed target detection through dual polarized 94 GHz radiometric sensor 双极化94ghz辐射传感器增强隐蔽目标探测能力
Ashok Kumar, B. Jassal
The concept of vector summation of a target response to two orthogonal polarized signals for enhancing its delectability, even under concealed conditions, have been demonstrated. A dual polarized 94 GHz radiometer mounted on a dual axis scanning systems has been utilized to collect the field data for the study of the concept. Emissivity gradient due to the presence of target embedded in a given background has been plotted in both orientation i.e. along x and y axis of the target using both horizontal and vertical polarization. Enhanced contrast due to vector summation of orthogonal polarization has been traced in both polarizations for concept validation.
对两个正交极化信号的目标响应矢量求和的概念,即使在隐蔽条件下,也能提高其可选性。已利用安装在双轴扫描系统上的双极化94千兆赫辐射计来收集用于研究该概念的现场数据。由于目标嵌入在给定背景中的存在,发射率梯度已在两个方向上绘制,即沿目标的x和y轴使用水平和垂直偏振。增强对比度由于矢量和正交偏振已跟踪在两个偏振概念验证。
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引用次数: 0
期刊
2016 International Conference on Emerging Trends in Communication Technologies (ETCT)
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