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.1992.335846
A. Petersen, A. Jagd
Two low noise tuned optical front-end GaAs MESFET MMIC amplifiers for a coherent optical CPFSK (Continuous Phase Frequency Shift Keying) receiver are presented. The receiver operates at 2.5 Gbit/s at an IF of approx. 9 GHz. The front-ends are based on full-custom designed MMICs and a commercially available GaInAs/InP pin photo diode. The procedure for measuring the transimpedance and the equivalent input noise current density is outlined in this paper and demonstrated using one of the MMICs. The MMICs were fabricated using the Plessey F20 process by GEC-Marconi through the ESPRIT programme EUROCHIP, and they both occupy 2 mm2.
{"title":"Tuned Optical Front-End MMIC Amplifiers for a Coherent Optical Receiver","authors":"A. Petersen, A. Jagd","doi":"10.1109/EUMA.1992.335846","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335846","url":null,"abstract":"Two low noise tuned optical front-end GaAs MESFET MMIC amplifiers for a coherent optical CPFSK (Continuous Phase Frequency Shift Keying) receiver are presented. The receiver operates at 2.5 Gbit/s at an IF of approx. 9 GHz. The front-ends are based on full-custom designed MMICs and a commercially available GaInAs/InP pin photo diode. The procedure for measuring the transimpedance and the equivalent input noise current density is outlined in this paper and demonstrated using one of the MMICs. The MMICs were fabricated using the Plessey F20 process by GEC-Marconi through the ESPRIT programme EUROCHIP, and they both occupy 2 mm2.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"40 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":"115336079","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.1992.335780
I. Tekin, A. Hizal
A frequency and phase scannring antenna array svstem having the capability of finding simultaneously the frequency and the direction of arrival of the incident wave by using simple amplitude measurements is described. Microstrip wide slot is used as the antenna array element due to its broad bandwidth. The incident RF wave received by the antenna array is fed to a detector logarithmic video amplifier(DLVA) to determine its amplitude. Finally, the maximum likelihood estimation procedure is applied to the observation vector formed by the DLVA outputs to estimate the frequency and the angle of incidence of the incoming wave.
{"title":"Simultaneous Frequency and Direction Finding Technique using Frequency Scanning Antenna","authors":"I. Tekin, A. Hizal","doi":"10.1109/EUMA.1992.335780","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335780","url":null,"abstract":"A frequency and phase scannring antenna array svstem having the capability of finding simultaneously the frequency and the direction of arrival of the incident wave by using simple amplitude measurements is described. Microstrip wide slot is used as the antenna array element due to its broad bandwidth. The incident RF wave received by the antenna array is fed to a detector logarithmic video amplifier(DLVA) to determine its amplitude. Finally, the maximum likelihood estimation procedure is applied to the observation vector formed by the DLVA outputs to estimate the frequency and the angle of incidence of the incoming wave.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"76 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":"123225709","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.1992.335725
M. Iskander
The NSF/IEEE Center for Computer Applications in Electromagnetic Education (CAEME) was established in early 1990 as a result of a grant from the Undergraduate Science, Engineering, and Mathematics Division of the National Science Foundation. To help provide broad and international participation in its activities, the Center is managed by the executive office of IEEE. CAEME's objective is to stimulate and accelerate the use of computers and software tools to help boost electrmagnetic education. It is shown in this paper that the Center has helped in propagating effective EM education by providing seed funds for software development projects, organizing workshops and special sessions, and through the publication of software books that contain diskettes of developed software. The Center also developed interactive video lessons and is almost self-supporting through corporate sponsorship.
{"title":"The Role of CAEME in the Stimulation and Propagation of Effective Electromagnetics Education in the USA and Abroad","authors":"M. Iskander","doi":"10.1109/EUMA.1992.335725","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335725","url":null,"abstract":"The NSF/IEEE Center for Computer Applications in Electromagnetic Education (CAEME) was established in early 1990 as a result of a grant from the Undergraduate Science, Engineering, and Mathematics Division of the National Science Foundation. To help provide broad and international participation in its activities, the Center is managed by the executive office of IEEE. CAEME's objective is to stimulate and accelerate the use of computers and software tools to help boost electrmagnetic education. It is shown in this paper that the Center has helped in propagating effective EM education by providing seed funds for software development projects, organizing workshops and special sessions, and through the publication of software books that contain diskettes of developed software. The Center also developed interactive video lessons and is almost self-supporting through corporate sponsorship.","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":"123370214","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}
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