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1977 7th European Microwave Conference最新文献

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Exact Efficiency Evaluation in Loaded Diffused Optical Waveguide Modulators 负载扩散光波导调制器的精确效率评估
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332401
V. Andresciani, M. Armenise, M. De Sario
{"title":"Exact Efficiency Evaluation in Loaded Diffused Optical Waveguide Modulators","authors":"V. Andresciani, M. Armenise, M. De Sario","doi":"10.1109/EUMA.1977.332401","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332401","url":null,"abstract":"In this paper, we consider an overlayed erfc diffused LiNbO3 ferroelectric crystal in order to design a planar-type modulator by the mode conversion method. The multilayer structure is analysed into two configurations; in the first the optical axis is perpendicular to the electrode plane, in the second is parallel. In both cases the effects on the coupling coefficient of the loading film refractive index and thickness and of the coplanar electrode spacing are described. The mapping of the modulating electric field components has been carried out by a finite element computer program by accounting the anisotropy and inhomogeneity of the structure. This exact evaluation of the r.f. field, along with the larger optical energy confinement at the surface due to the diffusion and to a high refractive index overlay, has allowed to obtain with the second configuration a modulation efficiency improvement of the 45%, the first being equal to 11.5 m-1.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133513091","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
Status and Trends in Microwave Acoustic Device Developments 微波声学器件的发展现状与趋势
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332395
K. Ingebrigtsen
{"title":"Status and Trends in Microwave Acoustic Device Developments","authors":"K. Ingebrigtsen","doi":"10.1109/EUMA.1977.332395","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332395","url":null,"abstract":"The implementation of the surface acoustic wave technology has transferred microwave acoustic devices from \"one of each kind\" to a mass production oriented technology. This has provided a new class of devices which are cost competitive with aiternative technology in a variety of applications. The presentation will summarize key surface wave device concepts and applications and discuss their limits of performance. Novel device concepts which are expected to become commercially available in the near future are also explained and evaluated.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114953142","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
Improvement of Wheat Seeds by Means of Microwave Irradiation 微波辐照对小麦种子的改良
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332435
Mahalaxmi Dixit, Snehil Verma, Chinmoy Das Gupta
{"title":"Improvement of Wheat Seeds by Means of Microwave Irradiation","authors":"Mahalaxmi Dixit, Snehil Verma, Chinmoy Das Gupta","doi":"10.1109/EUMA.1977.332435","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332435","url":null,"abstract":"","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115104643","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
Shadowing of an Inhomogeneous Plane Wave by an Edge 边缘对非均匀平面波的遮蔽
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332376
H. Bertoni, A. Green, L. Felsen
{"title":"Shadowing of an Inhomogeneous Plane Wave by an Edge","authors":"H. Bertoni, A. Green, L. Felsen","doi":"10.1109/EUMA.1977.332376","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332376","url":null,"abstract":"When an inhomogeneous plane wave or other type of evanescent field in a lossless medium strikes a large opaque object, the boundary of the shadow zone is displaced from the familiar geometric optical location for non-evanescent fields. This change is attributable to the complex propagation direction of evanescent waves. To study the mechanism of shadow formation, and indeed the significance of a shadow zone when the incident evanescent field may be weaker than diffracted fields generated by the obstacle, the problem of inhomogeneous plane diffraction by a perfectly conducting semi-infinite screen is investigated. By a careful asymptotic treatment and error analysis of the known exact solution, the location of the shadow boundary is determined, as is the transition region surrounding it wherein the field cannot be separated into incident and diffracted constituents. It is found that for strongly evanescent fields, the shadow boundary and transition zones differ markedly from those for a homogeneous plane wave. Effects of losses in the medium are also considered.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125784324","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: 17
Demultiplexer using Fast Hybrid Integrated ECL-Gates for 1 GBit/s PCM Signals 采用快速混合集成ecl门的1 GBit/s PCM信号解复用器
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332479
R. Petschacher, P. Russer
{"title":"Demultiplexer using Fast Hybrid Integrated ECL-Gates for 1 GBit/s PCM Signals","authors":"R. Petschacher, P. Russer","doi":"10.1109/EUMA.1977.332479","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332479","url":null,"abstract":"This paper describes a demultiplexer combined with a clock regenerator for 1 Gbit/s PCM signals. The demultiplexer divides the incoming signal into four parallel 250 Mbit/s channels using fast hybrid integrated ECL-gates with rise time of less than 400 ps. All clock signals needed to drive these gates are extracted from the input signal by a phase locked loop using two frequency doubler stages between the local oscillator and the phase detector. Since the logic levels and supply voltages of the hybrid integrated ECL-gates are fully compatible with those of monolithic integrated ECL circuits, such ECL-circuits can be directly connected to the outputs of the demultiplexer.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124842793","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: 6
A Modified Radiometer for Temperature and Microwave Properties Measurements of Biological Substances 一种用于测量生物物质温度和微波特性的改进辐射计
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332383
A. Mamouni, F. Bliot, Y. Leroy, Y. Moschetto
{"title":"A Modified Radiometer for Temperature and Microwave Properties Measurements of Biological Substances","authors":"A. Mamouni, F. Bliot, Y. Leroy, Y. Moschetto","doi":"10.1109/EUMA.1977.332383","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332383","url":null,"abstract":"The use of radiometers for biomedical applications needs a coherent understanding of thermal signals emitted by the tissues. In this paper, we show first, that some precautions have to be taken when measuring a temperature by the classical radiometric method. For instance, the signal emitted by a lossy material depends on its temperature, permittivity and thickness. This remark allows us to find out a new method for measuring microwave permittivity of liquids when using a Dicke radiometer. We propose a modified radiometric method to determine directly the temperature of the material whatever its reflection coefficient. The applicability of this method is tested with a X band set-up including FET microwave amplifiers. Possibilities of using probes for in situ temperature measurements are discussed.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129596779","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
A High Capacity Digital Transmission System at 11 GHz 11 GHz高容量数字传输系统
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332443
P. Hartmann, J. A. Crossett, Eddie W. A11en
{"title":"A High Capacity Digital Transmission System at 11 GHz","authors":"P. Hartmann, J. A. Crossett, Eddie W. A11en","doi":"10.1109/EUMA.1977.332443","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332443","url":null,"abstract":"The advent of high capacity digita1 microwave radio equipment is providing an attractive alternative for PCM transmission. A 90 Mb/s digital radio is described here which uses 8 PSK modu1ation, low loss filtering, and modern solid-state design to achieve a high system gain. A1so inc1uded is the performance of this radio when fi1tered to 2.26 bits/Hz and the performance with very heavy fi1tering needed to achieve 3 bits/Hz.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127103206","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
Resonant Frequency of Superposed Dielectric Resonators: Application to the Determination of the Local Dielectric Permittivity of M.I.C. Substrates 叠合介质谐振器的谐振频率:应用于微晶硅衬底局部介电常数的测定
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332482
M. Clapeau, P. Guillon, Y. Garault
{"title":"Resonant Frequency of Superposed Dielectric Resonators: Application to the Determination of the Local Dielectric Permittivity of M.I.C. Substrates","authors":"M. Clapeau, P. Guillon, Y. Garault","doi":"10.1109/EUMA.1977.332482","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332482","url":null,"abstract":"Several methods have been described to measure the permittivity of dielectric substrate, and all used the complete area of the sample and so give an average value of this parameter. But in the realization of microwave integrated circuits it is important to know dielectric parameters of the substrate at the point where the component is located. For this local characterization, we propose a method in which the substrate is in sandwich between two similar dielectric resonators. This non destructive method permits to determine the permittivity of a small area (few mm2) of the substrate, by comparing the measured and calculated resonant frequencies of the studied structure.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125341016","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
Generation and use of Composite Subnanosecond Waveforms for Measurements from 0.4 to l8 GHz 生成和使用复合亚纳秒波形测量从0.4至18 GHz
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332486
H. Cronson
{"title":"Generation and use of Composite Subnanosecond Waveforms for Measurements from 0.4 to l8 GHz","authors":"H. Cronson","doi":"10.1109/EUMA.1977.332486","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332486","url":null,"abstract":"A new generator is described which supplies a single subnanosecond waveform for measurements over the entire 0.4 to l8 GHz range. The very large instantaneous bandwidth is obtained from a composite waveform made up of quasi-impulse and RF burst. A 20 dB attenuation measurement using the generator shows agreement with calibrated values to within 0.2 dB over most of the frequency points. Thus it is now feasible to perform very wideband measurements with this relatively simple and inexpensive subnanosecond generator.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114090097","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
On the Cylindrical and Spherical Waves Spectral Contents of Radiated Electromagnetic Fields 辐射电磁场的柱面波和球面波频谱内容研究
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332378
E. Ojeba, C. Walter
{"title":"On the Cylindrical and Spherical Waves Spectral Contents of Radiated Electromagnetic Fields","authors":"E. Ojeba, C. Walter","doi":"10.1109/EUMA.1977.332378","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332378","url":null,"abstract":"General expressions for the cylindrical and spherical wave expansion coefficients of the field of an arbitrary antenna are determined, using the dyadic Green's function, expanded in the appropriate vector waves. The upper limit on the amplitudes of these coefficients yield simple expressions for determining the largest number of significant harmonics expected in the field. This number is found to be potentially large very close to the source and decreases with distance from it. The evaluated amplitude of the harmonics in the fields of practical antenna models validates the establish criterion and demonstrates the inadequacy of existing guidelines.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116202834","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
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