Pub Date : 1992-10-01DOI: 10.1109/EUMA.1992.335700
I. Dilworth
The interpretation of rainfall and clear weather radio propagation data, the generation of short and long term statistics for radio systems design and factors which are shown to increase potential errors in the application of measured data are discussed. The application of models of attenuation and cross-polarisation due to rainfall, upper atmosphere ice, snow, combinations of these hydrometeors and radio refractive effects are addressed.
{"title":"Limits on the Accuracy of Microwave Radio Propagation Modelling and on the Extrapolation of Measured Data Bases","authors":"I. Dilworth","doi":"10.1109/EUMA.1992.335700","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335700","url":null,"abstract":"The interpretation of rainfall and clear weather radio propagation data, the generation of short and long term statistics for radio systems design and factors which are shown to increase potential errors in the application of measured data are discussed. The application of models of attenuation and cross-polarisation due to rainfall, upper atmosphere ice, snow, combinations of these hydrometeors and radio refractive effects are addressed.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126391914","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}
Pub Date : 1992-10-01DOI: 10.1109/EUMA.1992.335752
M. Wong, O. Picon, V. Hanna
An accurate three-dimensional finite element formulation using edge elements is presented and applied on the characterization of multiaxial planar discontinuities.
提出了一种基于边缘单元的精确三维有限元公式，并将其应用于多轴平面不连续面的表征。
{"title":"Accurate Finite Element Formulation of Multiaxial Planar Discontinuities","authors":"M. Wong, O. Picon, V. Hanna","doi":"10.1109/EUMA.1992.335752","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335752","url":null,"abstract":"An accurate three-dimensional finite element formulation using edge elements is presented and applied on the characterization of multiaxial planar discontinuities.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122275304","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}
Pub Date : 1992-10-01DOI: 10.1109/EUMA.1992.335893
P. Fletcher, L. Auchterlonie
Recently completed computations of the field profiles existing within various microwave open resonator configurations are described for the following situations - perfectly aligned planar and spherical mirrors; misaligned spherical mirrors; imperfectly shaped spherical mirrors. The approach used, involves the sequential projecting of the field profile existing at one mirror on to the other until a steady state profile is obtained. The relative merits of two calculational methods are discussed. Results are presented for the various configurations.
{"title":"Analysis of Fields in Microwave Open Resonators with Detail on Perfect and Imperfect Mirrors","authors":"P. Fletcher, L. Auchterlonie","doi":"10.1109/EUMA.1992.335893","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335893","url":null,"abstract":"Recently completed computations of the field profiles existing within various microwave open resonator configurations are described for the following situations - perfectly aligned planar and spherical mirrors; misaligned spherical mirrors; imperfectly shaped spherical mirrors. The approach used, involves the sequential projecting of the field profile existing at one mirror on to the other until a steady state profile is obtained. The relative merits of two calculational methods are discussed. Results are presented for the various configurations.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122610964","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}
Pub Date : 1992-10-01DOI: 10.1109/EUMA.1992.335786
A. Madjar, A. Paolella, P. Herczfeld
The photodetection mechanisms in GaAs MESFETs have been investigated by several researchers. Recently the authors have published an in-depth study of the MESFET as an optical detector under constant illumination involving both experimental and theoretical modelling. In this paper we discuss the compressive nature of that photodetection process. Experimental results involving constant illumination, modulated light and pulsed illumination verify the theoretical conclusions. Finally we present a suggested structure of an RF logarithmic amplifier based on the above phenomenon.
{"title":"Possible Realization of an RF Logarithmic Amplifier by Use of Electrooptic Techniques","authors":"A. Madjar, A. Paolella, P. Herczfeld","doi":"10.1109/EUMA.1992.335786","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335786","url":null,"abstract":"The photodetection mechanisms in GaAs MESFETs have been investigated by several researchers. Recently the authors have published an in-depth study of the MESFET as an optical detector under constant illumination involving both experimental and theoretical modelling. In this paper we discuss the compressive nature of that photodetection process. Experimental results involving constant illumination, modulated light and pulsed illumination verify the theoretical conclusions. Finally we present a suggested structure of an RF logarithmic amplifier based on the above phenomenon.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121262062","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}
Pub Date : 1992-10-01DOI: 10.1109/EUMA.1992.335736
H. Krekels, B. Schiek, E. Menzel
A novel power detector for fast power measurements in RF technology is presented. The essential detector elements are field effect transistors. Due to the fact that the field effect transistors are used as passive elements, the detector features an exellent noise characteristic. Beside this, the power detector also shows a low sensitivity to temperature variations. Relating to noise characteristic, temperature stability and dynamic range the field effect detector is better than a Schottky diode detector.
{"title":"Power Detector with GaAs Field Effect Transistors","authors":"H. Krekels, B. Schiek, E. Menzel","doi":"10.1109/EUMA.1992.335736","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335736","url":null,"abstract":"A novel power detector for fast power measurements in RF technology is presented. The essential detector elements are field effect transistors. Due to the fact that the field effect transistors are used as passive elements, the detector features an exellent noise characteristic. Beside this, the power detector also shows a low sensitivity to temperature variations. Relating to noise characteristic, temperature stability and dynamic range the field effect detector is better than a Schottky diode detector.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127672024","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}
Pub Date : 1992-10-01DOI: 10.1109/EUMA.1992.335778
E. Ngai, L. Rhoades, A. Cardiasmenos
The compact range has become a popular measurement tool in the evaluation of microwave antennas in recent years. Larger aperture reflectors operating over the entire microwave and millimeter wave spectrum are now required, Olver (1). In this paper, the state-of-the-art design of a Very Large Compact Range (VLCR) reflector with dimensions of 36 meters × 32 meters is described. This VLCR reflector is predicted to achieve unique levels of performance in the large required quiet zone region of the design.
{"title":"Advanced Design Techniques for the Very Large Compact Range (VLCR) Reflector System","authors":"E. Ngai, L. Rhoades, A. Cardiasmenos","doi":"10.1109/EUMA.1992.335778","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335778","url":null,"abstract":"The compact range has become a popular measurement tool in the evaluation of microwave antennas in recent years. Larger aperture reflectors operating over the entire microwave and millimeter wave spectrum are now required, Olver (1). In this paper, the state-of-the-art design of a Very Large Compact Range (VLCR) reflector with dimensions of 36 meters × 32 meters is described. This VLCR reflector is predicted to achieve unique levels of performance in the large required quiet zone region of the design.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128115345","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}
Pub Date : 1992-10-01DOI: 10.1109/EUMA.1992.335767
A. Baghdad, E. Playez, G. Salmer
{"title":"Improvements of Microwave Performance of Low Noise MODFET Under Low Temperature Conditions","authors":"A. Baghdad, E. Playez, G. Salmer","doi":"10.1109/EUMA.1992.335767","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335767","url":null,"abstract":"","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133267919","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}
Pub Date : 1992-10-01DOI: 10.1109/EUMA.1992.335810
M. Piloni, M. Brambilla
This paper describes a novel design of MESFET based frequency multipliers with automatically stabilized output power level. This particular circuit configuration beside generating the desired output harmonic, allows to stabilize the output power level without inserting any additive control and detector circuit. To detail and verify theoretical performances, electrical results obtained on a 12/24 GHz freq. doubler are given and commented.
{"title":"MESFET Frequency Multipliers Including Detectorless ALC","authors":"M. Piloni, M. Brambilla","doi":"10.1109/EUMA.1992.335810","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335810","url":null,"abstract":"This paper describes a novel design of MESFET based frequency multipliers with automatically stabilized output power level. This particular circuit configuration beside generating the desired output harmonic, allows to stabilize the output power level without inserting any additive control and detector circuit. To detail and verify theoretical performances, electrical results obtained on a 12/24 GHz freq. doubler are given and commented.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131978302","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}
Pub Date : 1992-10-01DOI: 10.1109/EUMA.1992.335878
M. Vindevoghel, M. Hochedez, J. Legier
We present, in this article, some of the problems often encountered by the students when they start on a microwave course. We bring answers to these problems by means of Computer Assisted Learning and state in the conclusion our observations following an experiment of C.A.L. carried out at the University of Lille.
{"title":"How to Solve Your Pedagogical Problems in Microwaves","authors":"M. Vindevoghel, M. Hochedez, J. Legier","doi":"10.1109/EUMA.1992.335878","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335878","url":null,"abstract":"We present, in this article, some of the problems often encountered by the students when they start on a microwave course. We bring answers to these problems by means of Computer Assisted Learning and state in the conclusion our observations following an experiment of C.A.L. carried out at the University of Lille.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131856773","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}
Pub Date : 1992-10-01DOI: 10.1109/EUMA.1992.335861
T. Wakabayashi, T. Itoh
Laterally displaced microstrip lines which are coupled through a rectangular slot in a common ground plane are analyzed. Microstrips are displaced each other from the center of the slot. The analysis is based on the spectral domain method and the reciprocal theorem. Numerical results of the S parameters are shown for different values of displacement distance.
{"title":"Coupled Displaced Microstrip Lines Through a Rectangular Slot in a Common Ground Plane","authors":"T. Wakabayashi, T. Itoh","doi":"10.1109/EUMA.1992.335861","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335861","url":null,"abstract":"Laterally displaced microstrip lines which are coupled through a rectangular slot in a common ground plane are analyzed. Microstrips are displaced each other from the center of the slot. The analysis is based on the spectral domain method and the reciprocal theorem. Numerical results of the S parameters are shown for different values of displacement distance.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133774513","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：