Pub Date : 1992-10-01DOI: 10.1109/EUMA.1992.335873
S. Trabelsi, M. Ghomi, J. Peuch, H. Baudrand
A new approach for modeling the vegetation leaves in the X-band is presented. Here, as an example a corn leaf is considered, where it is assumed to be a superposition of a cylindrical dielectric post and a very thin dielectric sheet. We determine the complex dielectric constant by a simulation model from measured S-parameters.
{"title":"New Approach for Determining the Complex Dielectric Constant of Vegetation Leaves","authors":"S. Trabelsi, M. Ghomi, J. Peuch, H. Baudrand","doi":"10.1109/EUMA.1992.335873","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335873","url":null,"abstract":"A new approach for modeling the vegetation leaves in the X-band is presented. Here, as an example a corn leaf is considered, where it is assumed to be a superposition of a cylindrical dielectric post and a very thin dielectric sheet. We determine the complex dielectric constant by a simulation model from measured S-parameters.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"20 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":"114557963","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.1992.335701
D. Vanhoenacker, P. Carrette, A. Lenoir
The Microwaves Laboratory has been involved for more than ten years in the analysis of propagation data receivedfrom a satellite : first the OTS satellite and now the Olympus satellite of the E.S.A. Different transforms have been applied to the data in order to extract informations on the atmosphere. The Wavelet transform seems to be very powerful to analyse more deeply different types ofpropagation events.
{"title":"Application of the Wavelet Transform to the Analysis of Propagation Data","authors":"D. Vanhoenacker, P. Carrette, A. Lenoir","doi":"10.1109/EUMA.1992.335701","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335701","url":null,"abstract":"The Microwaves Laboratory has been involved for more than ten years in the analysis of propagation data receivedfrom a satellite : first the OTS satellite and now the Olympus satellite of the E.S.A. Different transforms have been applied to the data in order to extract informations on the atmosphere. The Wavelet transform seems to be very powerful to analyse more deeply different types ofpropagation events.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"16 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":"114882293","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.1992.335874
M. Mazanek, Z. Peceny, J. Janík, T. Cesky, C. Rumler
This paper deals with the possibility of multispectral radiometry using to determine local conditions of plants including inverse problems in localization and decomposition of measured data into the physical parameters - e.g. emissivity (noise temperature) into the "temperature" and "water contents". The possibility of the study of vegetation cover is interesting due to the different properties of water in microwave, mm and submillimeter regions. In order to retrieve information from measurement the following steps are to be done: - antenna pattern deconvolution, - apparent emissivity interpretation (decomposition). Applications could be possible in agriculture for the depression of the using of the protective chemical materials. Early and local determination of plants illness could be very attractive applications but there are also many experimental difficulties.
{"title":"Multispectral Radiometry for the Determination of the Vegetation Cover Conditions","authors":"M. Mazanek, Z. Peceny, J. Janík, T. Cesky, C. Rumler","doi":"10.1109/EUMA.1992.335874","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335874","url":null,"abstract":"This paper deals with the possibility of multispectral radiometry using to determine local conditions of plants including inverse problems in localization and decomposition of measured data into the physical parameters - e.g. emissivity (noise temperature) into the \"temperature\" and \"water contents\". The possibility of the study of vegetation cover is interesting due to the different properties of water in microwave, mm and submillimeter regions. In order to retrieve information from measurement the following steps are to be done: - antenna pattern deconvolution, - apparent emissivity interpretation (decomposition). Applications could be possible in agriculture for the depression of the using of the protective chemical materials. Early and local determination of plants illness could be very attractive applications but there are also many experimental difficulties.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"62 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":"123503012","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.1992.335735
R. Baltusis, M. Dagys, R. Simniškis
Original resistive sensors (RS) based on the effect of semiconductor bulk resistance change due to microwave electric field are designed. The resistive sensors are developed for high pulse power (1W-lOOkW) measurements in rectangular waveguides. Resistive sensors have fast response time, high reliability and overload resistance.
{"title":"Resistive Sensors for High Pulse Power Microwave Measurements","authors":"R. Baltusis, M. Dagys, R. Simniškis","doi":"10.1109/EUMA.1992.335735","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335735","url":null,"abstract":"Original resistive sensors (RS) based on the effect of semiconductor bulk resistance change due to microwave electric field are designed. The resistive sensors are developed for high pulse power (1W-lOOkW) measurements in rectangular waveguides. Resistive sensors have fast response time, high reliability and overload resistance.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"21 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":"129747316","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.1992.335741
S. El-Ghazaly, S. Strazdus
This paper compares the characteristics of superconducting microstrip lines to those of inverted microstrip line with the aim of obtaining the optimal structure that suits certain applications. Characteristics of two high Tc superconducting planar structures on LaA103 are evaluated using a two-dimensional numerical code based on the two fluid model and the TMz mode solution. The losses in the superconducting strip as well as the dielectric losses are taken into consideration. Three structures of the same characteristic impedance are considered. It is shown that the inverted microstrip line has a more uniform current and magnetic flux-density distributions, and lower dielectric and conductor losses, which makes it well suited for high current transmission. Although the microstrip line has more dielectric and conductor losses, it has a higher Q factor due to the large energy stored in the dielectric substrate.
{"title":"Optimization of High Tc Superconducting Microwave Planar Structures","authors":"S. El-Ghazaly, S. Strazdus","doi":"10.1109/EUMA.1992.335741","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335741","url":null,"abstract":"This paper compares the characteristics of superconducting microstrip lines to those of inverted microstrip line with the aim of obtaining the optimal structure that suits certain applications. Characteristics of two high Tc superconducting planar structures on LaA103 are evaluated using a two-dimensional numerical code based on the two fluid model and the TMz mode solution. The losses in the superconducting strip as well as the dielectric losses are taken into consideration. Three structures of the same characteristic impedance are considered. It is shown that the inverted microstrip line has a more uniform current and magnetic flux-density distributions, and lower dielectric and conductor losses, which makes it well suited for high current transmission. Although the microstrip line has more dielectric and conductor losses, it has a higher Q factor due to the large energy stored in the dielectric substrate.","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":"128232110","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.1992.335894
S. Zagriadski
This paper reports an electrodynamic analysis and possible applications of tunable multiport ferrite-dielectric structures with parallel transmission lines of an arbitrary type coupled through magnetostatic modes of magnetized multilayered thin ferrite films. The structures are supposed to be excited at one port by a falling electromagnetic wave and amplitudes and phases of electromagnetic waves at other ports are obtained in the result of an analytical procedure. The model is valid for an arbitrary direction of a magnetizing field and can describe the generation and interaction of magnetostatic modes due to the finite width of ferrite films. A reaction of magnetostatic waves on transducers' magnetic fields which produce them is taken into account. Derived closed-form expressions for response functions of multiports provide the base for modeling and design of a wide class of magnetostatic wave devices: multichannel adjustable filters and delay lines, directional couplers, power dividers, multiport resonators. The theory is also applicable for the analysis of multiport and interdigital transducers. In conventional two-port filters and delay lines a mutual coupling of trarnsducers is proved to be responsible for passband ripples in frequency responses.
{"title":"Theory and Applications of Multiport Structures using Magnetostatic Waves","authors":"S. Zagriadski","doi":"10.1109/EUMA.1992.335894","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335894","url":null,"abstract":"This paper reports an electrodynamic analysis and possible applications of tunable multiport ferrite-dielectric structures with parallel transmission lines of an arbitrary type coupled through magnetostatic modes of magnetized multilayered thin ferrite films. The structures are supposed to be excited at one port by a falling electromagnetic wave and amplitudes and phases of electromagnetic waves at other ports are obtained in the result of an analytical procedure. The model is valid for an arbitrary direction of a magnetizing field and can describe the generation and interaction of magnetostatic modes due to the finite width of ferrite films. A reaction of magnetostatic waves on transducers' magnetic fields which produce them is taken into account. Derived closed-form expressions for response functions of multiports provide the base for modeling and design of a wide class of magnetostatic wave devices: multichannel adjustable filters and delay lines, directional couplers, power dividers, multiport resonators. The theory is also applicable for the analysis of multiport and interdigital transducers. In conventional two-port filters and delay lines a mutual coupling of trarnsducers is proved to be responsible for passband ripples in frequency responses.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"2 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":"130049809","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.1992.335840
P. Descamps, M. El Bekkali, J. Vindevoghel
To automate the driving of terrestrial vehicles, it is necessary to determine with the highest accuracy instantaneous information about the motion of the vehicles, especially the values of the instantaneous speed and of the distance covered by the mobile. A full integrated microwave Doppler radar including a GaAs MMIC microwave head with a MESFET oscillator and a MESFET mixer, and using a plane printed antenna is described. This system which was tested in laboratory and also on vehicles can be used for a lot of other applications such as antilocking, antiskating systems, active suspensions, automatic tolls, and communications between vehicles or between a vehicle and the ground.
{"title":"A GaAs MMIC Doppler Sensor for Automotive Applications","authors":"P. Descamps, M. El Bekkali, J. Vindevoghel","doi":"10.1109/EUMA.1992.335840","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335840","url":null,"abstract":"To automate the driving of terrestrial vehicles, it is necessary to determine with the highest accuracy instantaneous information about the motion of the vehicles, especially the values of the instantaneous speed and of the distance covered by the mobile. A full integrated microwave Doppler radar including a GaAs MMIC microwave head with a MESFET oscillator and a MESFET mixer, and using a plane printed antenna is described. This system which was tested in laboratory and also on vehicles can be used for a lot of other applications such as antilocking, antiskating systems, active suspensions, automatic tolls, and communications between vehicles or between a vehicle and the ground.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"2 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":"129018685","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.1992.335758
J. W. Boyles
The task of making accurate antenna measurements is complicated by the numerous sources of measurement error in the antenna test range. In addition to the test system peformance, the overall measurement uncertainty depends strongly upon the range configuration and user-selected operating conditions. A correct understanding of these systematic and random error sources can help optimize the test range, instrument configuration, and measurement technique to achieve the highest levels of measurement accuracy. This paper describes dominant error sources present on an antenna test range and gives methods for quantifying their effects on measurement accuracy.
{"title":"Determining Measurement Accuracy in Antenna Test","authors":"J. W. Boyles","doi":"10.1109/EUMA.1992.335758","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335758","url":null,"abstract":"The task of making accurate antenna measurements is complicated by the numerous sources of measurement error in the antenna test range. In addition to the test system peformance, the overall measurement uncertainty depends strongly upon the range configuration and user-selected operating conditions. A correct understanding of these systematic and random error sources can help optimize the test range, instrument configuration, and measurement technique to achieve the highest levels of measurement accuracy. This paper describes dominant error sources present on an antenna test range and gives methods for quantifying their effects on measurement accuracy.","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":"130988578","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.1992.335695
K. Markus, A. Roederer, M. Shelley, D. Brain
A frequency scanning satellite payload concept for aeronautical passenger communication at Ka-band is presented. Aeronautical passenger communications services via satellite at Ka-band have been frequently considered, but no practical system has yet been implemented because of the high required RF power and of the satellite antenna complexity. If the coverage area is limited to the North-Atlantic or to Europe instead of the whole Earth, frequency scanning seems to offer a very attractive solution.
{"title":"A Frequency Scanning Concept for Aeronautical Satellite Communications","authors":"K. Markus, A. Roederer, M. Shelley, D. Brain","doi":"10.1109/EUMA.1992.335695","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335695","url":null,"abstract":"A frequency scanning satellite payload concept for aeronautical passenger communication at Ka-band is presented. Aeronautical passenger communications services via satellite at Ka-band have been frequently considered, but no practical system has yet been implemented because of the high required RF power and of the satellite antenna complexity. If the coverage area is limited to the North-Atlantic or to Europe instead of the whole Earth, frequency scanning seems to offer a very attractive solution.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"32 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":"130439941","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.1992.335864
W. Schwab, W. Menzel
A suspended stripline to microstrip transition using multilayer techniques is investigated theoretically and experimentally. With this transition the advantages of both transmission line types can be combined in one integrated circuit. Coupling of the lines is obtained by overlapping of the suspended stripline and the microstrip line placed on different sides of a common substrate. The transition is analysed using a spectral domain approach and resonance techniques. The calculation method is verified by comparison of calculated and measured results.
{"title":"A Suspended Stripline to Microstrip Transition using Multilayer Techniques","authors":"W. Schwab, W. Menzel","doi":"10.1109/EUMA.1992.335864","DOIUrl":"https://doi.org/10.1109/EUMA.1992.335864","url":null,"abstract":"A suspended stripline to microstrip transition using multilayer techniques is investigated theoretically and experimentally. With this transition the advantages of both transmission line types can be combined in one integrated circuit. Coupling of the lines is obtained by overlapping of the suspended stripline and the microstrip line placed on different sides of a common substrate. The transition is analysed using a spectral domain approach and resonance techniques. The calculation method is verified by comparison of calculated and measured results.","PeriodicalId":317106,"journal":{"name":"1992 22nd European Microwave Conference","volume":"287 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":"125386468","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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