2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition最新文献

{"title":"A CPW-fed circularly polarized spiral slot antenna with wideband operation","authors":"K. Hsiao, Jin-Wei Wu, Chien‐Jen Wang","doi":"10.1109/IWEM.2012.6320358","DOIUrl":"https://doi.org/10.1109/IWEM.2012.6320358","url":null,"abstract":"A wideband slot antenna with both linear and circular polarization (CP) is presented in this work. By embedding an arc slot, the spiral slots antenna achieve the circular polarization. The measured impedance bandwidth of a S11<;-10 dB ranges from 1.25 to 8 GHz and covers most of the commercial wireless communication systems. The measured 3-dB axial-ratio bandwidth (ARBW) is 10.6 % with respect to 1.605 GHz.","PeriodicalId":314019,"journal":{"name":"2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121753855","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}

{"title":"Antennas for 60GHz high-speed radio systems","authors":"C. Chan, K. Ng, D. Wang, H. Wong, Selina Qu","doi":"10.1109/IWEM.2012.6320332","DOIUrl":"https://doi.org/10.1109/IWEM.2012.6320332","url":null,"abstract":"In this paper, we discuss the current demands and challenges of antennas for 60GHz high-speed radio systems. Research works, as reported in open literature, from various research groups are reviewed. Addressing their limitations, we present some of our recent results on 60GHz antennas in terms of antenna gain, bandwidth, backlobe and cross-polarization level.","PeriodicalId":314019,"journal":{"name":"2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129602836","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}

{"title":"On-Board printed coupled-fed antenna for hexa-band WWAN/LTE Mobile Phone","authors":"Shun Yang, Y. Ban, J. L. Li","doi":"10.1109/IWEM.2012.6320360","DOIUrl":"https://doi.org/10.1109/IWEM.2012.6320360","url":null,"abstract":"A compact size On-Board printed antenna using capacitive coupled-fed excitation to generate multiple resonant modes at dual band for Hexa-band operation covering GSM850/DCS1800/PCS1900/UMTS2100/LTE2300/2500 applied in the mobile phone is presented. The proposed antenna occupies only a small footprint of 15×25 mm2 on the circuit board. With such a compact size, it can achieve compact integration of the internal on-board printed antenna on the circuit board of the mobile phone, thus especially suitable for the slim mobile phone application.","PeriodicalId":314019,"journal":{"name":"2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114301013","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}

{"title":"A novel spectrum occupancy anomaly detection method based on time series analysis theory","authors":"Wang Lei, Xie Shuguo","doi":"10.1109/IWEM.2012.6320374","DOIUrl":"https://doi.org/10.1109/IWEM.2012.6320374","url":null,"abstract":"Efficient spectrum management and dynamic spectrum access networks heavily rely on accurate statistics of spectrum utilization and temporal behaviour modelling of spectrum occupancy. In this paper, we propose a novel method for spectrum occupancy time-varying characteristics analysis, which includes modelling and anomaly detection of dynamic spectrum occupancy data. First, through the procedure of preprocessing and statistical test for measured spectrum data, we demonstrate the conditional heteroskedasticity existed in spectrum occupancy time-varying series. Furthermore, we present an EGARCH (exponential generalized auto regressive conditional heteroskedasticity) model to fit the variance of spectrum occupancy. Finally, we present an iteration algorithm to detect spectrum occupancy anomaly, and the empirical results show that the proposed method can identify the outliers of spectrum occupancy series without the need for a prior knowledge.","PeriodicalId":314019,"journal":{"name":"2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124903111","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}

{"title":"A series-fed metamaterial microstrip antenna array of broadband and high-gain","authors":"Lang Wang, Long Wang, J. L. Li","doi":"10.1109/IWEM.2012.6320361","DOIUrl":"https://doi.org/10.1109/IWEM.2012.6320361","url":null,"abstract":"A two-element series-fed metamaterial rectangular microstrip array of broadband and high-gain is proposed, designed, and fabricated. Arranging metamaterial patches to a series-fed array shown is demonstrated to have significant improvement of the antenna performance in terms of bandwidth broadening and gain enhancement. The array also inherits the high efficiency and low loss advantages of the metamaterial antenna working in microwave and RF frequencies. In the configuration consideration and gain characteristics analysis of the metamaterial antenna, the microstrip feedline connecting the patches is off-centered unlike an ordinary series-fed array. The design procedure is discussed in detail in the paper. The array is fabricated and experimental data are collected, where a good agreement between the simulated and measured results is obtained. As compared to the shunt-fed array, the proposed feeding network is significantly simplified so that the array dimension can be effectively reduced.","PeriodicalId":314019,"journal":{"name":"2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition","volume":"35 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129415691","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}

{"title":"The coaxial gyrotron with two beams","authors":"Shenggang Liu","doi":"10.1109/IWEM.2012.6320341","DOIUrl":"https://doi.org/10.1109/IWEM.2012.6320341","url":null,"abstract":"Summary form only given. The energy becomes one of the most crucial problems in the world. It is common recognition that Nuclear Fusion is considered the best approach to solve the energy problem. There two kinds of Nuclear Fusion: inertial confined fusion and magnetic confined fusion. The ITER (International Thermonuclear Experimental Reactor) might be a good promising potential expectation to solve this problem eventually. One of the biggest difficulties is the Plasma heating. To get the nuclear fusion occur, the high density plasma should be heated to over 100×1million K degree. The best approach is ECH. But it requires 1-2MW CW at 0.17 THz frequency. To do so, only Gyrotron is capable to generate such CW high power at such high frequency. However, after about 30 years efforts, 1-2 MW with only less than 1000 sec long pulse can be obtained. The Coaxial Gyrotron with two beams (CGTB) was invented in the year of 2005, theoretical study and computer simulation show that CGTB may solve this difficulties. Its characteristics and potential capability will be presented in this talk.","PeriodicalId":314019,"journal":{"name":"2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114378041","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}

{"title":"Power-to-Amplitude Transformation (PAT) for the analysis of guide-wave system based on FDTD method","authors":"J. You, Jian-feng Zhan, T. Cui","doi":"10.1109/IWEM.2012.6320344","DOIUrl":"https://doi.org/10.1109/IWEM.2012.6320344","url":null,"abstract":"In this paper, we introduce one efficient Power-to-Amplitude Transformation (PAT) technique based on the Finite-Difference Time-Domain (FDTD) method for the electromagnetic simulation of the guide-wave system. Due to the time-domain characteristic, FDTD method is one of the most popular numerical EM methods to analyze the guide-wave problem excited by harmonic or non-harmonic signal. With the rigorous derivation, we have successfully solved the PAT challenge which is provided by the dispersive character of guide-wave system. The simulation results indicate the PAT technique is exact and efficient.","PeriodicalId":314019,"journal":{"name":"2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121544456","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}

{"title":"Investigation on planar UWB antenna with triple band-notched characteristics","authors":"Pu Zhuo, Hongyan Tang, Xiulei Gao, Feifei Zhao, Fuyun Zhang","doi":"10.1109/IWEM.2012.6320364","DOIUrl":"https://doi.org/10.1109/IWEM.2012.6320364","url":null,"abstract":"A novel ultrawideband (UWB) printed planar antenna with triple band-notched characteristics is proposed and discussed in this paper. The realization of the proposed antenna's triple band-notched characteristics is owed to slots on the ground plane and the radiating patch. By employing a curve-shaped defected ground structure (DGS) on the ground plane, a notched band of (SATCOM) 8.0-8.4 GHz is achieved. By embedding two arc-shaped slots on the radiating patch, another two notched bands of (WIMAX) 3.3-3.6 GHz and (WLAN) 5.1-5.8 GHz are achieved. The proposed antenna has been successfully simulated, fabricated, and measured. Moreover, the designed antenna is compact size and lower cost, which is benefit for UWB communication system.","PeriodicalId":314019,"journal":{"name":"2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134368300","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}

{"title":"Metamaterials - From new concepts to applications","authors":"T. Cui","doi":"10.1109/IWEM.2012.6320340","DOIUrl":"https://doi.org/10.1109/IWEM.2012.6320340","url":null,"abstract":"For a long time, the natural materials have been classified into two types: crystals and noncrys-tals, until Daniel Shechtman discovered quasicrystals in 1982, who won the Nobel chemistry prize in 2011 for this work. In fact, crystals and noncrystals are composed of periodically-distributed and randomly-distributed atoms, while quasicrystals have a third material state between crystals and noncrystals: which are non-periodic structures of atoms with certain rules instead of random. Hence the two factors to affect natural material properties are the atoms themselves and the spatial arrangements of atoms. Quasicrystals have brought a lot of new features of materials and found applications in steel armour, non-stick frying pans, and devices in cars for recycling waste heat into electricity. However, it is very hard to control atoms themselves and their spatial arrangements to get more material properties. Metamaterials provide us a freedom to tailor the material properties, both for electric and magnetic. Metamaterials are composed of periodic or non-periodic structures of artificial “atoms” or “particles”, which have a size of subwavelength scale. The flexible design of single artificial particles, the feasible arrangements of such particles, and the high anisotropy make it possible to control the material properties as desired: metamaterials can be used to realize the effective permittivity and/or permeability which cannot be achieved in nature. Hence they have either unique features with unusual physical phenomena (such as negative refraction, invisibility cloak, optical illusion, etc.) or superior performance than the natural materials. In this talk, I will focus on microwave metamaterials and introduce their counterparts to crystals, noncrystals, and quasicrystals: homogeneous metamaterials, random metamaterials, and inhomogeneous metamaterials. For all three cases, I will introduce the new concepts and important experiments and applications in microwave frequencies conducted in my group, including the invisibility cloaks, electromagnetic black hole, radar illusion devices, power combination for omnidirectional radiations, planar gradient-index lenses, flattened Luneburg lens, Maxwell fisheye lens, high-gain Vivaldi antennas, and decoupling device for MIMO system.","PeriodicalId":314019,"journal":{"name":"2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124008748","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}

{"title":"Reconfigurable antennas for wireless communication","authors":"D. Chang","doi":"10.1109/IWEM.2012.6320339","DOIUrl":"https://doi.org/10.1109/IWEM.2012.6320339","url":null,"abstract":"In this talk, a radiation beam reconfigurable antenna that can be implemented as a compact, low cost and pattern diversity will be presented. The antenna is a combination of two one-half wavelength dipole antenna. This type of antenna is a planar structure and its maximum directional radiation beam pattern presents in azimuth plane with the covering of 360 degree. To validate the proposed design, a switched-beam antenna for smart antenna which has operating at the frequency of 2.45GHz is simulated and fabricated. Except for the above antenna, other reconfigurable antennas which are designed and implemented for wireless communication will also be presented.","PeriodicalId":314019,"journal":{"name":"2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128690929","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}