发布求助
文献互助 智能选刊 最新文献

1998 Symposium on Antenna Technology and Applied Electromagnetics最新文献

筛选
英文 中文
TLM simulations of parasitic coupling in rectangular dielectric resonator antennas 矩形介质谐振器天线寄生耦合的TLM仿真
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861714
B. Henry, A. Petosa, Y. Antar, G. Morin
{"title":"TLM simulations of parasitic coupling in rectangular dielectric resonator antennas","authors":"B. Henry, A. Petosa, Y. Antar, G. Morin","doi":"10.1109/ANTEM.1998.7861714","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861714","url":null,"abstract":"TLM simulations and experimental investigations are carried out at 13–15 GHz using parasitically coupled rectangular dielectric resonator antenna elements. Several configurations are examined with the results being increased bandwidth, dual frequency operation and manipulated radiation pattern characteristics. Close agreement is obtained between measurement and simulation.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122733666","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
Loss reduction techniques and layout design consideration for planar integrated RF feeds 平面集成射频馈电的减损技术及布局设计考虑
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861802
Lei Zhu, K. Wu
{"title":"Loss reduction techniques and layout design consideration for planar integrated RF feeds","authors":"Lei Zhu, K. Wu","doi":"10.1109/ANTEM.1998.7861802","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861802","url":null,"abstract":"Layout design techniques are examined in order to reduce potential radiation loss of feed circuits. Hybrid mode method of moments (MoM) is used to characterize microstrip discontinuities such as bends, steps and T-junctions that are building blocks in a planar integrated RF feed. It includes frequency dispersion, radiation and leakage losses. The equivalent circuit of these elements can be obtained by applying our newly proposed parameter extraction technique. With databases generated from the field-theoretical model, some design guidelines are presented and discussed for any potential loss reduction schemes. Results are given, indicating the importance of adverse effects due to dispersion and losses in the design of low-loss and compact RF feed.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121825091","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
Evaluation of free-space propagation in hospital corridors 医院走廊自由空间传播的评价
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861692
D. Davis, B. Segal, G. Tait, T. Pavlasek
{"title":"Evaluation of free-space propagation in hospital corridors","authors":"D. Davis, B. Segal, G. Tait, T. Pavlasek","doi":"10.1109/ANTEM.1998.7861692","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861692","url":null,"abstract":"It has been proposed that increased usage of wireless communication (e.g. portable radio-frequency (RF) sources; wireless local area networks) should reduce health care costs and improve clinical-care efficiency. However, such increased usage must take place without increasing the risk of electromagnetic interference (EMI) to medical devices. Recommendations for electromagnetic compatibility (EMC) in health care environments have been described [e.g., ref 1]. Central to such recommendations is the requirement to manage RF sources and susceptible medical devices so that their interaction is minimized. It is usually proposed that this be done by specifying a Minimal Separation between RF sources of given power and medical devices of given immunity, assuming that free-space propagation is approximately valid. Alternately, it has been proposed that Zones be specified where approved RF sources and approved medical devices can operate. The latter approach would be required in areas where free-space propagation is invalid. We describe a preliminary study that assesses the validity of free-space propagation in hospital corridors, in order to evaluate whether minimal separations predicted by free-space propagation might safely permit EMC within corridors of a typical urban hospital.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117178532","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
Transient electromagnetic modeling with the transmission line matrix (TLM) method — Progress and applications 用传输线矩阵(TLM)方法进行瞬变电磁建模。进展与应用
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861719
W. Hoefer
{"title":"Transient electromagnetic modeling with the transmission line matrix (TLM) method — Progress and applications","authors":"W. Hoefer","doi":"10.1109/ANTEM.1998.7861719","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861719","url":null,"abstract":"In this paper, recently developed techniques for analyzing electromagnetic structures and materials using time and space discrete time domain field simulation will be described, with emphasis on the Transmission Line Modeling (TLM) method. The advantages but also the challenges of electromagnetic field modeling in the time domain will be discussed, and specific examples will be presented.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129053989","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
Green dyadic and dipole radiation in composite omega-chiral medium 复合-手性介质中的绿色双矢和偶极子辐射
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861685
D. Cheng, Y. Antar
{"title":"Green dyadic and dipole radiation in composite omega-chiral medium","authors":"D. Cheng, Y. Antar","doi":"10.1109/ANTEM.1998.7861685","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861685","url":null,"abstract":"Green dyadic and electromagnetic fields of a dipole radiator in a composite omega-chiral medium are presented by introducing a set of auxiliary fields. Right- and left-handed circularly polarized eigenwaves, which travel with different velocity and have exponentially-attenuated amplitude, can be simultaneously excited.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128157306","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
A 3D vector LGA model for computational electromagnetics 计算电磁学的三维矢量LGA模型
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861800
M. Zhang, G. Bridges, N. Simons
{"title":"A 3D vector LGA model for computational electromagnetics","authors":"M. Zhang, G. Bridges, N. Simons","doi":"10.1109/ANTEM.1998.7861800","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861800","url":null,"abstract":"Lattice gas automata (LGA) are an alternative to the traditional differential equation based numerical methods now widely used in computational electromagnetics[1]. Lattice gas automata are based on studying the behaviour of an extremely large array of simple cells. The states of the cells are very simple, usually consisting of only a few bits per cell. A lattice gas is a microscopic description of physics of the problem being modelling, where the bits in the cell can be envisioned as particles which are intended to mimic the interaction of particles on the lattice. The LGA evolves in discrete time steps, where all cells in the lattice are updated in synchronism according to the sample simple rule.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128060509","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
Frequency prediction of micro strip ring antennas using transmission line model 基于传输线模型的微带环形天线频率预测
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861743
P. Mousavi, L. Shafai
{"title":"Frequency prediction of micro strip ring antennas using transmission line model","authors":"P. Mousavi, L. Shafai","doi":"10.1109/ANTEM.1998.7861743","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861743","url":null,"abstract":"The radiation from microstrip patch antennas can be calculated from the equivalent magnetic current distributions around the edges of radiating patch. The magnetic current values can be obtained from the edge voltage (with respect to the ground plane) distributions. Thus the problem of microstrip antenna analysis reduces to that of finding the edge voltage distributions, for a given excitation and for a specified mode of the resonance of the patch. If one considers a rectangular microstrip patch operating in the TM10 (or any TMm0) mode, voltage distribution at the edges may be obtained by using a transmission line model. The transmission line equivalent of a TMm0 mode microstrip may be used to represent the network equivalents of various microstrip antenna configurations, and also for the patches described by the generalized curvilinear coordinate system, where the separation of variable method can be applied to the wave equation. This modelling approach has been used extensively in the analysis and design of microstrip antennas. However its applications are limited because of the inherent assumptions/ approximations in this approach for non-curvilinear coordinates[1].","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126693718","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
Design of a dual reflector antenna with shaped-omnidirectional pattern 形状全向图双反射面天线的设计
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861749
M. Orefice, C. Tartaglia
{"title":"Design of a dual reflector antenna with shaped-omnidirectional pattern","authors":"M. Orefice, C. Tartaglia","doi":"10.1109/ANTEM.1998.7861749","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861749","url":null,"abstract":"In this paper, a new concept to obtain an azimuthal shaping of an omnidirectional antenna pattern for mm-waves will be presented. Previous papers have shown that a dual reflector antenna with parabolic subreflector, conical main reflector and a suitable feed pattern and excitation exhibits a linearly polarized omnidirectional pattern; here the conical main reflector is modified in its azimuthal profile in order to produce a non uniform power distribution in azimuth.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124497547","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
Recent progress in reflector antenna analysis & design 反射面天线分析与设计的新进展
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861673
T. Bird
{"title":"Recent progress in reflector antenna analysis & design","authors":"T. Bird","doi":"10.1109/ANTEM.1998.7861673","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861673","url":null,"abstract":"The latter part of the 20th century has seen significant changes and improvements in the design and practice of reflectorantennas. As well as traditional users of reflectors, such as defence, telecommunication utilities and radio astronomy, significant consumer markets have now opened up. For instance, it is common for many homes and offices to have a dish connected to a wall or roof. At the same time design techniques for reflectors and associated feed systems have also undergone change. Until a few years ago effectsthat were poorly modelled or completely ignored that can now be analysed include, reflectoredge diffraction, near-field effects, grid, composite and painted surfaces, accurate feed models, mutual coupling and scattering in feed arrays, and reflector/feedinteractions. Shaped reflectors are now widely used on satellite antennas, and dielectric-loaded horns are replacing corrugated horns in some earth station applications. It is the purpose here to outline some recent changes and improvements in the design and synthesis techniques used for reflectors and feeds.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127848384","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
A new method for tapered open-ended coaxial line probe in determining relative complex permittivity at radio and microwave frequencies 锥形开口同轴线探头在无线电和微波频率下测定相对复介电常数的新方法
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861731
F. Lan, C. Akyel, F. Ghannouchi
{"title":"A new method for tapered open-ended coaxial line probe in determining relative complex permittivity at radio and microwave frequencies","authors":"F. Lan, C. Akyel, F. Ghannouchi","doi":"10.1109/ANTEM.1998.7861731","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861731","url":null,"abstract":"The measurement of complex permittivity of dielectric materials using coaxial line reflection methods at radio and microwave frequencies is of great interest. Peoples in basic and applied research areas as well as those in industry have an increasing requirement on the knowledge of the dielectric properties of materials. Based on coaxial line reflection methods, different probes employing various sizes and shapes are supposed and investigated[1]. Some of these methods have certain high requests on the configurations of the test samples. The dielectric properties of air and other materials are different and reflected microwaves are so sensitive to the dielectric properties of the materials under test that any small gap between samples and probes will cause measurement errors. The difficulties in preparing the samples lie in the necessity of precise cutting and machining. This cause researchers to find new probes which are easy to produce, have low requests on the preparation of samples and have tight contact between probes and samples[2∼4].","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127972803","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
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
请完成安全验证×
相关产品
×
本文献相关产品
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 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信