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On slot antennas input impedance and efficiency 对槽型天线输入阻抗和效率进行了研究
Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851706
A. P. Popov, Y. Antar
{"title":"On slot antennas input impedance and efficiency","authors":"A. P. Popov, Y. Antar","doi":"10.1109/ANTEM.2000.7851706","DOIUrl":"https://doi.org/10.1109/ANTEM.2000.7851706","url":null,"abstract":"The formulas presented in the paper allow fast and reasonably accurate estimation of printed slot antennas efficiency and driving point impedance. They can be used at the initial stage of the antenna design to choose optimal values for the substrate parameters and slot length. The internal feature of printed slot antennas that is to radiate the most of the input power into a media with a higher dielectric constant, results in their low efficiency, since the dielectric constant of the substrate is usually much higher then that of the atmosphere. The same feature, however, makes the printed slot antennas a very attractive feeder for the DRA, since the dielectric permittivity of the DRA can be chosen much higher then that of the substrate. The generalization of the presented formulas for some practical antenna structures of interest, such as slot antenna driving a hemispherical dielectric resonator or slot antenna on a finite width dielectric substrate is straightforward. Some preliminarily results on these structures are to be reported during the presentation. The accuracy of the method can be increased since the current distribution M (y) = (L/2 − |y|) × cos[k × (L/2 − |y|)] also allows the closed form expression for the antenna impedance. This function together with (1) can be used for very efficient implementation of the MoM for the printed antenna impedance and efficiency calculations.","PeriodicalId":416991,"journal":{"name":"Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000]","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127806887","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 simplifid analysis of coplanar waveguide coupler by using conformal mapping transformations 用保角映射变换对共面波导耦合器的简化分析
Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851666
M. Elkordy
{"title":"A simplifid analysis of coplanar waveguide coupler by using conformal mapping transformations","authors":"M. Elkordy","doi":"10.1109/ANTEM.2000.7851666","DOIUrl":"https://doi.org/10.1109/ANTEM.2000.7851666","url":null,"abstract":"A simplified study for microstrip coplanar waveguide coupler is presented. In this study a new formulas for even and odd mode capacitance in multi-layers structure have been proposed. The proposed formulas are derived based on the conformal mapping method. In this paper the effect of multi-layers substrate with different dielectric constants on the propagation characteristics of cpw coupler has been presented. We have compared the results given by spectral domain method. The comparison indicating that the proposed formulas are accurate, and efficient for determing the propagation characteristics in multi-layers microstrip structure.","PeriodicalId":416991,"journal":{"name":"Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000]","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116071927","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
Measured electric near-fields of model cellular transmitters in the presence of human head models at 2.0 GHz 在2.0 GHz人类头部模型存在的情况下，测量了模型细胞发射机的近电场
Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851659
D. Cule, J. Seregelyi
{"title":"Measured electric near-fields of model cellular transmitters in the presence of human head models at 2.0 GHz","authors":"D. Cule, J. Seregelyi","doi":"10.1109/ANTEM.2000.7851659","DOIUrl":"https://doi.org/10.1109/ANTEM.2000.7851659","url":null,"abstract":"This paper will report on measurements of the electric near-field generated by a model transmitter at 2.0 GHz in close proximity to a cube model head filled with fluid simulating the dielectric properties of the human brain. Schmid & Partner Engineering AG near-field and dosimetry probes were used in conjunction with the DASY-2 mini measurement software and a planar scanner to measure the electric near-field and calculate the specific absorption rate (SAR) in various planes. The measured data presented in this paper, as well as related information, is available at http://www.crc.ca/remc.","PeriodicalId":416991,"journal":{"name":"Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000]","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115357609","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
SAR antenna development in Canada 加拿大SAR天线的发展
Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851713
G. Séguin, T. Pellerin
{"title":"SAR antenna development in Canada","authors":"G. Séguin, T. Pellerin","doi":"10.1109/ANTEM.2000.7851713","DOIUrl":"https://doi.org/10.1109/ANTEM.2000.7851713","url":null,"abstract":"Work conducted by the Canadian Industry over the past few years, in collaboration with the Canadian Space Agency, in the field of SAR antenna technologies has resulted in major innovative technology development. Three different concepts were presented as well as the Radarsat 2 SAR antenna.","PeriodicalId":416991,"journal":{"name":"Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000]","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125170615","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
Analysis of circular microstrip resonators using two-dimensional telegraphists' equations 利用二维电报方程分析圆形微带谐振器
Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851742
A. Ţugulea, I. Ciric
{"title":"Analysis of circular microstrip resonators using two-dimensional telegraphists' equations","authors":"A. Ţugulea, I. Ciric","doi":"10.1109/ANTEM.2000.7851742","DOIUrl":"https://doi.org/10.1109/ANTEM.2000.7851742","url":null,"abstract":"The two-dimensional telegraphists' equations have been used to determine resonant frequencies of an inhomogeneous microstrip circular resonator. The solution technique is simple and equations like (17) and (18) can be easily solved employing computation tools such as Mathematica or Matlab. Other structures, e.g. microstrip resonators with variable dielectric permittivity can also be treated in the manner presented in this paper.","PeriodicalId":416991,"journal":{"name":"Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000]","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124960198","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
Laser-diode to fiber coupling analysis using the Gaussian beam-BPM hybrid method 激光二极管与光纤耦合的高斯光束- bpm混合分析方法
Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851721
A. A. Shishegar, S. Safavi-Naeini, R. Faraji-Dana, Chenglin Xu
{"title":"Laser-diode to fiber coupling analysis using the Gaussian beam-BPM hybrid method","authors":"A. A. Shishegar, S. Safavi-Naeini, R. Faraji-Dana, Chenglin Xu","doi":"10.1109/ANTEM.2000.7851721","DOIUrl":"https://doi.org/10.1109/ANTEM.2000.7851721","url":null,"abstract":"Different structures are used for laser-diode to fiber coupling. The main purpose of using these structures is achieving more coupling coefficient for a known laser power output. Fig. 1 shows a typical structure. The coupling structure may include an arbitrary number of lenses which can be off-axis and/ or tilted and can have arbitrary defined surface profiles.","PeriodicalId":416991,"journal":{"name":"Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000]","volume":"72 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120992815","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
Spiral-loaded low-profile monopole antenna with parasitic elements 带有寄生元件的螺旋加载低轮廓单极天线
Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851698
H. Nakano, H. Mimaki, V. Shkawrytko
{"title":"Spiral-loaded low-profile monopole antenna with parasitic elements","authors":"H. Nakano, H. Mimaki, V. Shkawrytko","doi":"10.1109/ANTEM.2000.7851698","DOIUrl":"https://doi.org/10.1109/ANTEM.2000.7851698","url":null,"abstract":"The analysis of a reference SLA shows that the frequency bandwidth of the VSWR is approximately 7%. To increase the VSWR bandwidth, two inverted L-shaped parasitic elements are added to the SLA. This antenna, referred to as the SLA-P, has a w-shaped VSWR frequency response curve with two minima, where the VSWR values in the lower frequency region are undesirably high.","PeriodicalId":416991,"journal":{"name":"Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000]","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130729648","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: 1
A surface mount vector modulator for PCS 一种用于pc的表面贴装矢量调制器
Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851686
Michael J. Kobasa, E. Arvas
{"title":"A surface mount vector modulator for PCS","authors":"Michael J. Kobasa, E. Arvas","doi":"10.1109/ANTEM.2000.7851686","DOIUrl":"https://doi.org/10.1109/ANTEM.2000.7851686","url":null,"abstract":"Adjusting the amplitude and phase of a signal is the purpose of the vector modulator which has applications in feedforward power amplifiers, beamforming networks and other networks requiring phase and amplitude adjustments. The vector modulator designed here is a variable resistive device consisting of three, 3dB hybrid couplers, a Wilkinson power divider, four PIN diodes and DC biasing circuitry. The device designed is controlled by two independent current sources that allow between 6dB and 26dB attenuation and full 360° phase shift. Analysis of the entire network and the importance of the parasitics in the PIN diodes are described along with measured results of the implementation of linearizing the PIN diodes.","PeriodicalId":416991,"journal":{"name":"Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000]","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117068522","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
Choice of segments in the B=B(H) approximation using spline functions 用样条函数选择B=B(H)近似中的段
Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851641
C. Akyel, S. Babic
{"title":"Choice of segments in the B=B(H) approximation using spline functions","authors":"C. Akyel, S. Babic","doi":"10.1109/ANTEM.2000.7851641","DOIUrl":"https://doi.org/10.1109/ANTEM.2000.7851641","url":null,"abstract":"In this paper we show how the choice of selected points for building the basic curve of the first magnetization can influence the accuracy. The presented approach enables one to simply build curves B = B (H) and μ = μ(H) using the cubic spline functions C(2). All procedures are practically given analytically, so that by having good information on the magnetic field at the beginning and at the end of a treated curve given by the couple (H,B), we obtain the curve twice differentiable. It is important to mention that we do not need to have many date points to construct all presented curves. Having the approximation of the curve B = B (H) and using the software package ‘CURVES’, it is possible to get much more information about the maximal value of the relative magnetic permeability, the differential permeability and the approximation of the curve μ = μ(H). This powerful software can be used separately for each calculation or, as the complete program.","PeriodicalId":416991,"journal":{"name":"Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000]","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132782080","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
Electromagnetic interference form a TDMA cellular telephone with a hearing aid 带有助听器的TDMA蜂窝电话产生的电磁干扰
Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851654
K. Caputa, M. Stuchly
{"title":"Electromagnetic interference form a TDMA cellular telephone with a hearing aid","authors":"K. Caputa, M. Stuchly","doi":"10.1109/ANTEM.2000.7851654","DOIUrl":"https://doi.org/10.1109/ANTEM.2000.7851654","url":null,"abstract":"Cellular telephones such as the global system for mobile communication (GSM) and personal communication services (PCS) are well known to cause electromagnetic interference (EMI) with hearing aids. The magnitude of the acoustic interference depends on several parameters of the telephone and aid. For a given hearing aid and telephone, the EMI depends on the electric and magnetic fields in the location of the hearing aid. The magnitude and direction of electromagnetic fields from a cellular telephone are very different in the ear canal compared to those in free space. In this contribution we present the results of numerical modeling of one telephone and one hearing aid. This hearing aid was extensively investigated by the US Food and Drug Administration laboratory. They evaluated the ratios of acoustic signals at 217 Hz in the ear canal and free space from the same telephone. The telephone was for SGM, and operated at about 900 MHz with TDMA. Electric and magnetic fields in free space in very close proximity to the telephone were measured in its manufacturer's research laboratory.","PeriodicalId":416991,"journal":{"name":"Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000]","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133218051","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
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