首页 > 最新文献

无线工程与技术(英文)最新文献

英文 中文
An Investigation of Wideband Rectennas for Wireless Energy Harvesting 用于无线能量收集的宽带整流天线研究
Pub Date : 2014-10-08 DOI: 10.4236/WET.2014.54012
Jingwei Zhang, Yi Huang, P. Cao
This paper is focused on a wireless energy harvesting system using a rectifying antenna (rectenna). The proposed device consists of a wideband cross-dipole antenna, a microwave low-pass filter and a doubling rectifying circuit using Shottcky diodes as rectifying elements. Previously, a few of wideband rectennas have been investigated at 1.7 to 2.5 GHz. The originality of this paper is on the new wideband rectenna design which can harvest the ambient radio frequency (RF) power at 1.7 to 2.5 GHz. In this system, a new wideband cross dipole is designed and used to achieve the required bandwidth and duel-polarization. In addition, the voltage doubling rectifying circuit is optimized to achieve the best performance at power density levels < 200 μW/cm2 which are typical in urban environments. The characteristics of the proposed rectenna over the desired frequency range are investigated, and the integrated rectenna is simulated, made and tested for low input power densities from 5 to 200 μW/cm2. The simulation and measurement results of the rectenna are compared and a good agreement is achieved. The results demonstrate that the maximum rectenna conversion efficiency is nearly 57% around 1.7 GHz and over 20% over the wideband of interest for the incident power density of 120 μW/cm2. It is noted that the impedance matching is one of the main factors affecting the rectenna energy conversion efficiency. This new wideband rectenna has great potential to harvest wireless energy in GSM/3G/4G and ISM 2.4 GHz bands.
本文主要研究一种采用整流天线的无线能量收集系统。该器件由宽带交叉偶极子天线、微波低通滤波器和以肖特基二极管为整流元件的倍频整流电路组成。以前,已经研究了一些1.7到2.5 GHz的宽带天线。本文的创新之处在于新型宽带天线的设计,该天线可以采集1.7 ~ 2.5 GHz的环境射频(RF)功率。在该系统中,设计了一种新的宽带交叉偶极子,并使用它来实现所需的带宽和双极化。此外,对倍压整流电路进行了优化,使其在城市环境中典型的功率密度< 200 μW/cm2时具有最佳性能。研究了所提出的整流天线在期望频率范围内的特性,并在5 ~ 200 μW/cm2的低输入功率密度下对整流天线进行了仿真、制作和测试。对整流天线的仿真结果和实测结果进行了比较,得到了较好的一致性。结果表明,当入射功率密度为120 μW/cm2时,该天线在1.7 GHz附近的最大转换效率接近57%,在目标宽带上的最大转换效率超过20%。指出阻抗匹配是影响整流天线能量转换效率的主要因素之一。这种新型宽带整流天线在GSM/3G/4G和ISM 2.4 GHz频段具有巨大的无线能量收集潜力。
{"title":"An Investigation of Wideband Rectennas for Wireless Energy Harvesting","authors":"Jingwei Zhang, Yi Huang, P. Cao","doi":"10.4236/WET.2014.54012","DOIUrl":"https://doi.org/10.4236/WET.2014.54012","url":null,"abstract":"This paper is focused on a wireless energy harvesting system using a rectifying antenna (rectenna). The proposed device consists of a wideband cross-dipole antenna, a microwave low-pass filter and a doubling rectifying circuit using Shottcky diodes as rectifying elements. Previously, a few of wideband rectennas have been investigated at 1.7 to 2.5 GHz. The originality of this paper is on the new wideband rectenna design which can harvest the ambient radio frequency (RF) power at 1.7 to 2.5 GHz. In this system, a new wideband cross dipole is designed and used to achieve the required bandwidth and duel-polarization. In addition, the voltage doubling rectifying circuit is optimized to achieve the best performance at power density levels < 200 μW/cm2 which are typical in urban environments. The characteristics of the proposed rectenna over the desired frequency range are investigated, and the integrated rectenna is simulated, made and tested for low input power densities from 5 to 200 μW/cm2. The simulation and measurement results of the rectenna are compared and a good agreement is achieved. The results demonstrate that the maximum rectenna conversion efficiency is nearly 57% around 1.7 GHz and over 20% over the wideband of interest for the incident power density of 120 μW/cm2. It is noted that the impedance matching is one of the main factors affecting the rectenna energy conversion efficiency. This new wideband rectenna has great potential to harvest wireless energy in GSM/3G/4G and ISM 2.4 GHz bands.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"05 1","pages":"107-116"},"PeriodicalIF":0.0,"publicationDate":"2014-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70839060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 20
Demonstration of Automatic Impedance-Matching and Constant Power Feeding to and Electric Helicopter via Magnetic Resonance Coupling 基于磁共振耦合的电动直升机阻抗自动匹配与恒功率馈电论证
Pub Date : 2014-07-11 DOI: 10.4236/WET.2014.53006
M. Yamakawa, K. Shimamura, K. Komurasaki, H. Koizumi
Wireless power transfer (WPT) from a transmitter resonator on the ground to an electrically powered miniature heli-copter was attempted to demonstrate WPT using magnetic resonance coupling to an object moving in 3D space. The transmission efficiency was optimized by automatic impedance matching for different flight attitudes: a maximum flight altitude of 590 mm was achieved. Furthermore, an estimation method of transmission efficiency using only the properties on the transmitter side was proposed, with transmission power regulated as constant against the change in the coupling coefficient.
无线电力传输(WPT)从地面上的发射机谐振器到电动微型直升机,试图演示WPT使用磁共振耦合在三维空间中移动的物体。通过阻抗自动匹配优化不同飞行姿态下的传输效率,最大飞行高度达到590 mm。在此基础上,提出了一种仅利用发射端特性估计发射效率的方法,发射功率随耦合系数的变化而变化。
{"title":"Demonstration of Automatic Impedance-Matching and Constant Power Feeding to and Electric Helicopter via Magnetic Resonance Coupling","authors":"M. Yamakawa, K. Shimamura, K. Komurasaki, H. Koizumi","doi":"10.4236/WET.2014.53006","DOIUrl":"https://doi.org/10.4236/WET.2014.53006","url":null,"abstract":"Wireless power transfer (WPT) from a transmitter resonator on the ground \u0000to an electrically powered miniature heli-copter was attempted to demonstrate \u0000WPT using magnetic resonance coupling to an object moving in 3D space. The \u0000transmission efficiency was optimized by automatic impedance matching for \u0000different flight attitudes: a maximum flight altitude of 590 mm was achieved. \u0000Furthermore, an estimation method of transmission efficiency using only the \u0000properties on the transmitter side was proposed, with transmission power \u0000regulated as constant against the change in the coupling coefficient.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"5 1","pages":"45-53"},"PeriodicalIF":0.0,"publicationDate":"2014-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70839293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Dual Band MIMO Antenna Composed of Two Low Profile Unbalanced Fed Inverted L Antennas for Wireless Communications 无线通信中由两个低轮廓非平衡馈电倒L型天线组成的双频MIMO天线
Pub Date : 2014-07-11 DOI: 10.4236/WET.2014.53007
E. Rohadi, M. Taguchi
A low profile dual-band multiple-input-multiple-output (MIMO) antenna system is proposed. The proposed MIMO antenna consists of two low profile unbalanced fed inverted L antennas with parasitic elements to resonate at 2.45 GHz and 5 GHz. The structure is uncomplicated by locating two ultra low profile inverted L antennas on the finite conducting plane. The proposed MIMO antenna is numerically and experimentally analyzed. When the size of conducting plane is 55 mm by 55 mm and the height of antenna is 9 mm, the directive gain of 4.11 dBi and the S11 bandwidth of 5.71% are achieved for lower frequency of 2.45 GHz. At the upper frequency of 5 GHz, the directive gain of 8.22 dBi and the S11 bandwidth of 6% are obtained. The proposed antenna has good diversity gain, shown by the correlation coefficient becomes less than 0.005 at the frequency of 2.45 GHz and 5 GHz band when the distance between inverted L elements is 41 mm. A good agreement between calculated and measured results is obtained. The results show that the weak mutual coupling of the proposed antenna and this feature enables it to cover the required bandwidths for WLAN operation at the 2.4 GHz band and 5 GHz band.
提出了一种低姿态的双频多输入多输出(MIMO)天线系统。该MIMO天线由两个低轮廓非平衡馈电倒L型天线和寄生元件组成,分别在2.45 GHz和5 GHz频段谐振。通过在有限导电平面上定位两个超低轮廓倒L型天线,简化了结构。对所提出的MIMO天线进行了数值和实验分析。当导电平面尺寸为55 mm × 55 mm,天线高度为9 mm时,在2.45 GHz频段下,可获得4.11 dBi的指令增益和5.71%的S11带宽。在5ghz的上频段,获得了8.22 dBi的指示增益和6%的S11带宽。该天线具有良好的分集增益,当倒L单元之间的距离为41 mm时,在2.45 GHz和5 GHz频段的相关系数小于0.005。计算结果与实测结果吻合较好。结果表明,该天线的弱互耦合特性使其能够在2.4 GHz和5 GHz频段覆盖WLAN运行所需的带宽。
{"title":"Dual Band MIMO Antenna Composed of Two Low Profile Unbalanced Fed Inverted L Antennas for Wireless Communications","authors":"E. Rohadi, M. Taguchi","doi":"10.4236/WET.2014.53007","DOIUrl":"https://doi.org/10.4236/WET.2014.53007","url":null,"abstract":"A low profile dual-band multiple-input-multiple-output (MIMO) antenna \u0000system is proposed. The proposed MIMO antenna consists of two low profile unbalanced \u0000fed inverted L antennas with parasitic elements to resonate at 2.45 GHz and 5 \u0000GHz. The structure is uncomplicated by locating two ultra low profile inverted L \u0000antennas on the finite conducting plane. The proposed MIMO antenna is numerically \u0000and experimentally analyzed. When the size of conducting plane is 55 mm by 55 \u0000mm and the height of antenna is 9 mm, the directive gain of \u00004.11 dBi and the S11 bandwidth of 5.71% are achieved for lower frequency of 2.45 GHz. At the upper frequency of 5 GHz, the directive gain of 8.22 dBi and \u0000the S11 bandwidth of 6% are obtained. The proposed antenna has good diversity gain, shown by the correlation \u0000coefficient becomes less than 0.005 at the frequency of 2.45 GHz and 5 GHz band \u0000when the distance between inverted L elements is 41 mm. A good agreement between calculated and \u0000measured results is obtained. The results show that the weak mutual coupling of \u0000the proposed antenna and this feature enables it to cover the required \u0000bandwidths for WLAN operation at the 2.4 GHz band and 5 GHz band.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"5 1","pages":"54-61"},"PeriodicalIF":0.0,"publicationDate":"2014-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70839436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Performances of Micropower UWB Radar Using Orthogonal Waveforms 基于正交波形的微功率超宽带雷达性能研究
Pub Date : 2014-07-11 DOI: 10.4236/WET.2014.53009
L. Sakkila, A. Rivenq, C. Tatkeu, Y. Elhillali, J. Ghys
Radars and their applications were, for a long time, reserved to national defense, air security or weather service domains. For a few years, with the emergence of new technologies, radar applications have been developed and have become known in the civil domain. In particular, the arrival of UWB—Ultra-Wideband technology allows the design of compact and low-cost radars with multiple fields of application. In this paper, we focus on road applications, such as driving assistance with the objective of increasing safety and reducing accidents. In classical UWB radar systems, Gaussian and monocycle pulses are commonly used. In previous works, original waveforms based on orthogonal functions (Hermite and Gegenbauer) were proposed. These provide a good spatial resolution, suitable for radar detection. Another advantage of these waveforms is their multiple access capability, due to their orthogonality. The aim of the study presented in this article is to compare simulation and experimental results obtained, especially for short-range anticollision radar application, using these waveforms in one part and Gaussian and monocycle pulses in the other part. The originality of this paper relies on the new approach. Indeed, this comparison study using these waveforms has never been done before. Finally, some examples of real experiments in a real road environment with different waveforms are presented and analysed.
长期以来,雷达及其应用仅限于国防、空中安全或气象服务领域。几年来,随着新技术的出现,雷达的应用得到了发展,并在民用领域广为人知。特别是,uwb -超宽带技术的到来使得设计具有多个应用领域的紧凑型低成本雷达成为可能。在本文中,我们将重点放在道路应用上,例如驾驶辅助,目的是提高安全性和减少事故。在经典的超宽带雷达系统中,通常使用高斯脉冲和单周期脉冲。在以前的工作中,提出了基于正交函数(Hermite和Gegenbauer)的原始波形。这些提供了良好的空间分辨率,适合雷达探测。这些波形的另一个优点是由于它们的正交性而具有多址能力。本文的研究目的是比较仿真结果和实验结果,特别是在近距离防撞雷达应用中,使用这些波形作为一部分,高斯脉冲和单环脉冲作为另一部分。这篇论文的独创性在于新方法。事实上,这种使用这些波形的比较研究以前从未做过。最后,给出了在真实道路环境中采用不同波形的实验实例,并对其进行了分析。
{"title":"Performances of Micropower UWB Radar Using Orthogonal Waveforms","authors":"L. Sakkila, A. Rivenq, C. Tatkeu, Y. Elhillali, J. Ghys","doi":"10.4236/WET.2014.53009","DOIUrl":"https://doi.org/10.4236/WET.2014.53009","url":null,"abstract":"Radars and their applications were, for a long time, reserved to \u0000national defense, air security or weather service domains. For a few years, \u0000with the emergence of new technologies, radar applications have been developed \u0000and have become known in the civil domain. In particular, the arrival of UWB—Ultra-Wideband technology allows the design of compact and low-cost \u0000radars with multiple fields of application. In this paper, we focus on road applications, \u0000such as driving assistance with the objective of increasing safety and reducing \u0000accidents. In classical UWB radar \u0000systems, Gaussian and monocycle pulses are commonly used. In previous works, original waveforms based on orthogonal \u0000functions (Hermite and Gegenbauer) were proposed. These provide a good spatial \u0000resolution, suitable for radar detection. Another advantage of these waveforms \u0000is their multiple access capability, due to their orthogonality. The aim of the \u0000study presented in this article is to compare simulation and experimental \u0000results obtained, especially for short-range anticollision radar application, \u0000using these waveforms in one part and Gaussian and monocycle pulses in the \u0000other part. The originality of this \u0000paper relies on the new approach. Indeed, this comparison study using these \u0000waveforms has never been done before. Finally, some examples of real \u0000experiments in a real road environment with different waveforms are presented \u0000and analysed.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"05 1","pages":"74-87"},"PeriodicalIF":0.0,"publicationDate":"2014-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70839376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Design of Reconfigurable Band Notches Antenna for Cognitive Radio Applications 面向认知无线电应用的可重构带缺口天线设计
Pub Date : 2014-07-11 DOI: 10.4236/WET.2014.53011
H. Lalj, H. Griguer, M. Drissi
In this paper, an antenna with reconfigurable band notches, for cognitive radio applications, is proposed. The antenna can be operated as ultra wideband, and is reconfigurable in terms of the ability to select a notched band in the SRR resonant frequency. The reconfigurable band notches are induced using a band-stop filter based on split-ring resonators (SRRs), and are controlled using electronic switches mounted over the SRRs. For this sake, the design of the band-stop filter is proposed. A prototype of filter is fabricated and measured. The incorporation of a band-stop filter, into a wideband antenna, is then looked into. The proposed antenna is designed and simulated using Ansoft HFSS. A prototype of the antenna is fabricated and measured. A good analogy between simulated and measured results is obtained.
本文提出了一种具有可重构带缺口的天线,用于认知无线电应用。该天线可以作为超宽带工作,并且在SRR谐振频率中选择陷波带的能力方面是可重构的。可重构的带陷波由基于分环谐振器(SRRs)的带阻滤波器引起,并通过安装在SRRs上的电子开关进行控制。为此,提出了带阻滤波器的设计。制作了滤波器样机并进行了测试。结合带阻滤波器,进入宽带天线,然后进行了研究。采用Ansoft HFSS软件对该天线进行了设计和仿真。制作了天线样机并进行了测量。模拟结果与实测结果有很好的相似性。
{"title":"Design of Reconfigurable Band Notches Antenna for Cognitive Radio Applications","authors":"H. Lalj, H. Griguer, M. Drissi","doi":"10.4236/WET.2014.53011","DOIUrl":"https://doi.org/10.4236/WET.2014.53011","url":null,"abstract":"In this paper, an antenna with \u0000reconfigurable band notches, for cognitive radio applications, is proposed. The \u0000antenna can be operated as ultra wideband, and is reconfigurable in terms of \u0000the ability to select a notched band in the SRR resonant frequency. The reconfigurable \u0000band notches are induced using a band-stop filter based on split-ring \u0000resonators (SRRs), and are controlled using electronic switches mounted over \u0000the SRRs. For this sake, the design of the band-stop filter is proposed. A \u0000prototype of filter is fabricated and measured. The incorporation of a band-stop \u0000filter, into a wideband antenna, is then looked into. The proposed antenna is \u0000designed and simulated using Ansoft HFSS. A prototype of the antenna is \u0000fabricated and measured. A good analogy between simulated and measured results \u0000is obtained.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"2014 1","pages":"99-105"},"PeriodicalIF":0.0,"publicationDate":"2014-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70839014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Performance Evaluation of Diversity Techniques in IDMA Scheme for Next Generation (4G) in Underwater Wireless Communication 下一代水下无线通信(4G) IDMA分集技术性能评价
Pub Date : 2014-07-11 DOI: 10.4236/WET.2014.53010
Prachi Tripathi, M. Shukla
This paper provides a review on the diversity techniques of IDMA (Interleave Division Multiple Access) technology in underwater wireless IDMA employs interleavers as the only means in order to distinguish the users. This paper provides a comprehensive study of diversity techniques in IDMA scheme to mitigate the fading issue. In this paper, we compare the different generation diversity techniques in IDMA scheme on computational complexity, bit error rate and memory requirement. Recent advancement in underwater communication is modulation techniques, multiplexing techniques and multiple access techniques. Underwater communication channel is characterized.
本文综述了水下无线IDMA (Interleave Division Multiple Access)技术中的分集技术,该技术采用交织器作为区分用户的唯一手段。本文对IDMA方案中的分集技术进行了全面的研究,以缓解衰落问题。本文从计算复杂度、误码率和存储需求等方面比较了IDMA方案中不同的分集技术。水下通信的最新进展是调制技术、多路复用技术和多址技术。水下通信信道的特征。
{"title":"Performance Evaluation of Diversity Techniques in IDMA Scheme for Next Generation (4G) in Underwater Wireless Communication","authors":"Prachi Tripathi, M. Shukla","doi":"10.4236/WET.2014.53010","DOIUrl":"https://doi.org/10.4236/WET.2014.53010","url":null,"abstract":"This paper provides a \u0000review on the diversity techniques of IDMA (Interleave Division Multiple \u0000Access) technology in underwater wireless IDMA employs interleavers as the only \u0000means in order to distinguish the users. This paper provides a comprehensive \u0000study of diversity techniques in IDMA scheme to mitigate the fading issue. In \u0000this paper, we compare the different generation diversity techniques in IDMA scheme \u0000on computational complexity, bit error rate and memory requirement. Recent \u0000advancement in underwater communication is modulation techniques, multiplexing \u0000techniques and multiple access techniques. Underwater communication channel is \u0000characterized.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"5 1","pages":"88-98"},"PeriodicalIF":0.0,"publicationDate":"2014-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70839430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An Efficient Billing Scheme for Trusted Nodes Using Fuzzy Logic in Wireless Sensor Networks 基于模糊逻辑的无线传感器网络可信节点计费方案
Pub Date : 2014-07-11 DOI: 10.4236/WET.2014.53008
M. Shurman, Zaid A. Alomari, K. Mhaidat
Extending the lifetime of the wireless sensor networks (WSNs), where recharging sensors is not always possible, has been a major concern for researchers for the past decade. In this paper, we study the cooperation between nodes in wireless sensor networks in forwarding packets to others, and we propose a new collaboration technique which stimulates intermediate nodes to forward packets toward their destination. Some nodes show selfish behavior by denying the forwarding packets to other nodes in commercial networks in an effort to preserve their own energy. This paper applies a technique which is used to prolong the network lifetime, based on a node’s energy and trust value, and additionally incorporates fuzzy logic, which stimulates nodes to forward packets by rewarding cooperation. According to simulation results, the proposed approach surpasses the Nuglets (virtual currency) approach and the Reputation approach in network energy and thus prolongs the network lifetime. Additionally, our proposed approach demonstrates better results in the number of dropped packets, PDR and forwarded packets to neighboring nodes.
延长无线传感器网络(wsn)的寿命一直是过去十年研究人员关注的主要问题,因为无线传感器并不总是能够充电。本文研究了无线传感器网络中节点之间在转发数据包时的协作,提出了一种激励中间节点向目的地转发数据包的新型协作技术。在商业网络中,一些节点表现出自私的行为,拒绝向其他节点转发数据包,以保护自己的能量。本文采用了一种基于节点能量和信任值延长网络生命周期的技术,并结合模糊逻辑,通过奖励合作来激励节点转发数据包。仿真结果表明,该方法在网络能量上优于虚拟货币方法和声誉方法,从而延长了网络的生命周期。此外,我们提出的方法在丢包数量、PDR数量和转发到邻近节点的数据包数量方面显示出更好的结果。
{"title":"An Efficient Billing Scheme for Trusted Nodes Using Fuzzy Logic in Wireless Sensor Networks","authors":"M. Shurman, Zaid A. Alomari, K. Mhaidat","doi":"10.4236/WET.2014.53008","DOIUrl":"https://doi.org/10.4236/WET.2014.53008","url":null,"abstract":"Extending the lifetime of the wireless sensor networks (WSNs), where recharging sensors is not always possible, has been a major concern for researchers for the past decade. In this paper, we study the cooperation between nodes in wireless sensor networks in forwarding packets to others, and we propose a new collaboration technique which stimulates intermediate nodes to forward packets toward their destination. Some nodes show selfish behavior by denying the forwarding packets to other nodes in commercial networks in an effort to preserve their own energy. This paper applies a technique which is used to prolong the network lifetime, based on a node’s energy and trust value, and additionally incorporates fuzzy logic, which stimulates nodes to forward packets by rewarding cooperation. According to simulation results, the proposed approach surpasses the Nuglets (virtual currency) approach and the Reputation approach in network energy and thus prolongs the network lifetime. Additionally, our proposed approach demonstrates better results in the number of dropped packets, PDR and forwarded packets to neighboring nodes.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"05 1","pages":"62-73"},"PeriodicalIF":0.0,"publicationDate":"2014-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70839469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Wireless Infrared Pyrometer with Fiber Optic: Construction and Processing Algorithms 光纤无线红外高温计:构造与处理算法
Pub Date : 2014-04-29 DOI: 10.4236/WET.2014.52004
I. Orlov, I. A. Nikiforov, A. Afanasjev
In this paper, developed wireless portable infrared pyrometer with dual channel fiber optic is described. The pyrometer measures surface temperature in wide infrared spectral range of 2 - 25 um. A data processing algorithm based on the methods of synchronous detection providing accuracy
本文介绍了一种研制成功的无线便携式双通道光纤红外高温计。高温计在2 - 25um的宽红外光谱范围内测量表面温度。一种基于提供精度的同步检测方法的数据处理算法
{"title":"Wireless Infrared Pyrometer with Fiber Optic: Construction and Processing Algorithms","authors":"I. Orlov, I. A. Nikiforov, A. Afanasjev","doi":"10.4236/WET.2014.52004","DOIUrl":"https://doi.org/10.4236/WET.2014.52004","url":null,"abstract":"In this paper, developed wireless portable infrared pyrometer with dual channel fiber optic is described. The pyrometer measures surface temperature in wide infrared spectral range of 2 - 25 um. A data processing algorithm based on the methods of synchronous detection providing accuracy","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"5 1","pages":"25-33"},"PeriodicalIF":0.0,"publicationDate":"2014-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70839104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Two Low Profile Unbalanced Fed Inverted L Elements on Square Conducting Plane for MIMO Applications 方形导电平面上两种低轮廓非平衡馈电倒L型元件的MIMO应用
Pub Date : 2014-04-29 DOI: 10.4236/WET.2014.52005
E. Rohadi, M. Taguchi
Two ultra low profile inverted L antennas located on the square conducting plane are numerically and experimentally analyzed as the multiple input multiple output (MIMO) antenna system. When the size of conducting plane is 0.45 λ by 0.45 λ and the height of antenna is 0.03 λ, the directive gain of 4.12 dBi and the return loss bandwidth of 3.67% are achieved. The proposed antenna has good diversity gain shown by the correlation coefficient, and becomes less than 0.02 at the frequency of 2.45 GHz band when the distance between inverted L elements is 0.33 λ. The results show the weak mutual coupling of the proposed antenna and its performances are promising as MIMO antenna applications.
对位于方形导电面上的两个超低轮廓倒L型天线作为多输入多输出(MIMO)天线系统进行了数值和实验分析。当导电平面尺寸为0.45 λ × 0.45 λ,天线高度为0.03 λ时,天线的定向增益为4.12 dBi,回波损耗带宽为3.67%。相关系数表明,该天线具有良好的分集增益,在2.45 GHz频段,当倒L元之间的距离为0.33 λ时,分集增益小于0.02。结果表明,该天线具有弱互耦合特性,在MIMO天线应用中具有良好的性能。
{"title":"Two Low Profile Unbalanced Fed Inverted L Elements on Square Conducting Plane for MIMO Applications","authors":"E. Rohadi, M. Taguchi","doi":"10.4236/WET.2014.52005","DOIUrl":"https://doi.org/10.4236/WET.2014.52005","url":null,"abstract":"Two ultra low profile inverted L antennas located on the square conducting plane are numerically and experimentally analyzed as the multiple input multiple output (MIMO) antenna system. When the size of conducting plane is 0.45 λ by 0.45 λ and the height of antenna is 0.03 λ, the directive gain of 4.12 dBi and the return loss bandwidth of 3.67% are achieved. The proposed antenna has good diversity gain shown by the correlation coefficient, and becomes less than 0.02 at the frequency of 2.45 GHz band when the distance between inverted L elements is 0.33 λ. The results show the weak mutual coupling of the proposed antenna and its performances are promising as MIMO antenna applications.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"5 1","pages":"34-43"},"PeriodicalIF":0.0,"publicationDate":"2014-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70839182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Wireless Power Transmission into a Space Enclosed by Metal Walls Using Magnetic Resonance Coupling 利用磁共振耦合将无线电力传输到金属墙封闭的空间
Pub Date : 2014-01-09 DOI: 10.4236/WET.2014.51003
M. Yamakawa, Y. Mizuno, Jun Ishida, K. Komurasaki, H. Koizumi
In this paper, a wireless power transmission system using magnetic resonance coupling was proposed and demonstrated for supplying power at high efficiency to electrical devices in a space enclosed by metal walls. This is applicable to power supply to electrical sensors or devices working in the area surrounded by metal walls. Proposed magnetic resonance coupling system is driven at a resonance frequency of 50 Hz, which is selected to avoid eddy current loss on the surrounding metals. Firstly, resonator designs and its performance limitation were described. Secondly, the equivalent circuits and theoretical transmission efficiency were presented. Finally, power transmission was experimentally demonstrated and transmission efficiency was measured in some conceivable situations. As a result, electric power of 3 W was supplied to LEDs over a stainless steel wall. When the stainless steel wall thickness was 10 mm, transmission efficiency of approximately 40% was achieved over the transmission distance of 12 cm. Moreover, in the demonstration of transmission through a metal pipe, 1.2 W of power was transmitted to LEDs in a 10 mm thick metal pipe.
本文提出并演示了一种利用磁共振耦合的无线电力传输系统,该系统可以在金属墙封闭的空间内为电气设备高效供电。适用于在金属墙周围区域工作的电子传感器或设备的供电。所提出的磁共振耦合系统的驱动频率为50 Hz,选择该频率是为了避免对周围金属的涡流损耗。首先,介绍了谐振器的设计及其性能限制。其次,给出了等效电路和理论传输效率。最后,对功率传输进行了实验验证,并在一些可能的情况下测量了传输效率。因此,通过不锈钢墙为led提供了3w的电力。当不锈钢壁厚为10 mm时,在12 cm的传输距离内,传输效率约为40%。此外,在通过金属管传输的演示中,在10毫米厚的金属管中向led传输了1.2 W的功率。
{"title":"Wireless Power Transmission into a Space Enclosed by Metal Walls Using Magnetic Resonance Coupling","authors":"M. Yamakawa, Y. Mizuno, Jun Ishida, K. Komurasaki, H. Koizumi","doi":"10.4236/WET.2014.51003","DOIUrl":"https://doi.org/10.4236/WET.2014.51003","url":null,"abstract":"In this paper, a wireless power transmission system using magnetic resonance coupling was proposed and demonstrated for supplying power at high efficiency to electrical devices in a space enclosed by metal walls. This is applicable to power supply to electrical sensors or devices working in the area surrounded by metal walls. Proposed magnetic resonance coupling system is driven at a resonance frequency of 50 Hz, which is selected to avoid eddy current loss on the surrounding metals. Firstly, resonator designs and its performance limitation were described. Secondly, the equivalent circuits and theoretical transmission efficiency were presented. Finally, power transmission was experimentally demonstrated and transmission efficiency was measured in some conceivable situations. As a result, electric power of 3 W was supplied to LEDs over a stainless steel wall. When the stainless steel wall thickness was 10 mm, transmission efficiency of approximately 40% was achieved over the transmission distance of 12 cm. Moreover, in the demonstration of transmission through a metal pipe, 1.2 W of power was transmitted to LEDs in a 10 mm thick metal pipe.","PeriodicalId":68067,"journal":{"name":"无线工程与技术(英文)","volume":"5 1","pages":"19-24"},"PeriodicalIF":0.0,"publicationDate":"2014-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70838724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 34
期刊
无线工程与技术(英文)
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1