无线工程与技术(英文)最新文献_第6页

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

无线工程与技术(英文) Pub Date : 2014-10-08 DOI: 10.4236/WET.2014.54012

Jingwei Zhang, Yi Huang, P. Cao

{"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

无线工程与技术(英文) Pub Date : 2014-07-11 DOI: 10.4236/WET.2014.53006

M. Yamakawa, K. Shimamura, K. Komurasaki, H. Koizumi

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

无线工程与技术(英文) Pub Date : 2014-07-11 DOI: 10.4236/WET.2014.53007

E. Rohadi, M. Taguchi

{"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

无线工程与技术(英文) Pub Date : 2014-07-11 DOI: 10.4236/WET.2014.53009

L. Sakkila, A. Rivenq, C. Tatkeu, Y. Elhillali, J. Ghys

{"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

无线工程与技术(英文) Pub Date : 2014-07-11 DOI: 10.4236/WET.2014.53011

H. Lalj, H. Griguer, M. Drissi

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

无线工程与技术(英文) Pub Date : 2014-07-11 DOI: 10.4236/WET.2014.53010

Prachi Tripathi, M. Shukla

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

无线工程与技术(英文) Pub Date : 2014-07-11 DOI: 10.4236/WET.2014.53008

M. Shurman, Zaid A. Alomari, K. Mhaidat

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

无线工程与技术(英文) Pub Date : 2014-04-29 DOI: 10.4236/WET.2014.52004

I. Orlov, I. A. Nikiforov, A. Afanasjev

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

无线工程与技术(英文) Pub Date : 2014-04-29 DOI: 10.4236/WET.2014.52005

E. Rohadi, M. Taguchi

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

无线工程与技术(英文) Pub Date : 2014-01-09 DOI: 10.4236/WET.2014.51003

M. Yamakawa, Y. Mizuno, Jun Ishida, K. Komurasaki, H. Koizumi

{"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