Pub Date : 2001-10-01DOI: 10.1109/EUMA.2001.338903
V. Brankovic, K. Kawasaki, K. Sasaki, K. Fukuzawa, Y. Okada, D. Krupezevic, M. Ratni, H. Alikhani
Data rate demand for wireless systems due to variety of applications is permanently growing. Recently, 60 GHz band is worldwide allocated as a possible band for ultrabroadband applications. In this paper basic scenarios for outdoor, underground and large hall type of environments are proposed, together with technology requirements and specific technology solutions. In contrast to the clear indoor applications, the new additional approach opens new applications within public download capabilities, and high data rate communication in GigaBit/s area. The basic ideas for the new arts of the business model where connectivity is free of charge are outlined.
{"title":"60 GHz Wireless Access System Concept","authors":"V. Brankovic, K. Kawasaki, K. Sasaki, K. Fukuzawa, Y. Okada, D. Krupezevic, M. Ratni, H. Alikhani","doi":"10.1109/EUMA.2001.338903","DOIUrl":"https://doi.org/10.1109/EUMA.2001.338903","url":null,"abstract":"Data rate demand for wireless systems due to variety of applications is permanently growing. Recently, 60 GHz band is worldwide allocated as a possible band for ultrabroadband applications. In this paper basic scenarios for outdoor, underground and large hall type of environments are proposed, together with technology requirements and specific technology solutions. In contrast to the clear indoor applications, the new additional approach opens new applications within public download capabilities, and high data rate communication in GigaBit/s area. The basic ideas for the new arts of the business model where connectivity is free of charge are outlined.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123446880","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 : 2001-10-01DOI: 10.1109/EUMA.2001.338927
F. Arndt, Joern Brandt, J. Ritter
A fast full-wave CAD method is described for the accurate design and optimization of advanced waveguide components including cross-sections, planar structures, or 3D elements of arbitrary shape as well as coax feeds. The method is based on the combination of the mode-matching (MM) technique with the 2D finite-element (FE) and the 3D finite difference (FD) algorithm, which unites advantageously the flexibility of the FE and the FD methods with the efficiency of the MM technique. Typical design examples such as H-plane iris filters cut in the E-plane with finite radii and filters fed by coaxial waveguides demonstrate the usefulness of the presented CAD tool. The theory is verified by measurements.
{"title":"MM/FE/FD CAD Method for the Optimization of Waveguide Filters Including Structures of Arbitrary Shape and Coax Feeds","authors":"F. Arndt, Joern Brandt, J. Ritter","doi":"10.1109/EUMA.2001.338927","DOIUrl":"https://doi.org/10.1109/EUMA.2001.338927","url":null,"abstract":"A fast full-wave CAD method is described for the accurate design and optimization of advanced waveguide components including cross-sections, planar structures, or 3D elements of arbitrary shape as well as coax feeds. The method is based on the combination of the mode-matching (MM) technique with the 2D finite-element (FE) and the 3D finite difference (FD) algorithm, which unites advantageously the flexibility of the FE and the FD methods with the efficiency of the MM technique. Typical design examples such as H-plane iris filters cut in the E-plane with finite radii and filters fed by coaxial waveguides demonstrate the usefulness of the presented CAD tool. The theory is verified by measurements.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123807757","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 : 2001-10-01DOI: 10.1109/EUMA.2001.339145
J. Sercu, L. Knockaert, D. De Zutter
This paper describes a new mesh reduction technology that significantly increases the electromagnetic modelling efficiency of planar RF and Microwave interconnect structures. This technology reduces the redundancy in the method of moments equations due to the geometrical complexity of the structure. It comprises a generalization of the basis functions used in the discretization of the surface currents. The generalized basis functions allow for a more efficient meshing of complex geometrical structures in terms of polygonal shaped cells. The increased simulation performance is demonstrated for a complex microwave package interconnection structure.
{"title":"A New Mesh Reduction Technology for the Method of Moments Modelling of Planar RF and Microwave Interconnects","authors":"J. Sercu, L. Knockaert, D. De Zutter","doi":"10.1109/EUMA.2001.339145","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339145","url":null,"abstract":"This paper describes a new mesh reduction technology that significantly increases the electromagnetic modelling efficiency of planar RF and Microwave interconnect structures. This technology reduces the redundancy in the method of moments equations due to the geometrical complexity of the structure. It comprises a generalization of the basis functions used in the discretization of the surface currents. The generalized basis functions allow for a more efficient meshing of complex geometrical structures in terms of polygonal shaped cells. The increased simulation performance is demonstrated for a complex microwave package interconnection structure.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122454365","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 : 2001-10-01DOI: 10.1109/EUMA.2001.339002
Y. Campos-Roca, L. Verweyen, M. Fernández-Barciela, M. C. Curras-Francos, E. Sánchez, A. Hulsmann, M. Schlechtweg
In this paper, a novel theoretical comparison of MESFET and HEMT performances as frequency multipliers for different harmonic orders is presented. Additionally, three W-band single-ended coplanar PHEMT MMIC multipliers (a doubler, a tripler and a quadrupler) are reported. The experimental results show state-of-the art performance and verify the theoretical conclusions.
{"title":"Millimeter-wave Active MMIC Frequency Multipliers","authors":"Y. Campos-Roca, L. Verweyen, M. Fernández-Barciela, M. C. Curras-Francos, E. Sánchez, A. Hulsmann, M. Schlechtweg","doi":"10.1109/EUMA.2001.339002","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339002","url":null,"abstract":"In this paper, a novel theoretical comparison of MESFET and HEMT performances as frequency multipliers for different harmonic orders is presented. Additionally, three W-band single-ended coplanar PHEMT MMIC multipliers (a doubler, a tripler and a quadrupler) are reported. The experimental results show state-of-the art performance and verify the theoretical conclusions.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130249552","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 : 2001-10-01DOI: 10.1109/EUMA.2001.338979
J. Bandler, J. Rayas-Sánchez, Q. Zhang
In this work, an efficient procedure to realize electromagnetics-based yield optimization and statistical analysis of microwave structures using space mapping-based neuromodels is proposed. A generalized relationship between the fine and coarse model sensitivities through the Jacobian of the neuromapping is proposed. Our technique is illustrated by the EM-based statistical analysis and yield optimization of an HTS microstrip filter.
{"title":"Yield-Driven EM Optimization using Space Mapping-Based Neuromodels","authors":"J. Bandler, J. Rayas-Sánchez, Q. Zhang","doi":"10.1109/EUMA.2001.338979","DOIUrl":"https://doi.org/10.1109/EUMA.2001.338979","url":null,"abstract":"In this work, an efficient procedure to realize electromagnetics-based yield optimization and statistical analysis of microwave structures using space mapping-based neuromodels is proposed. A generalized relationship between the fine and coarse model sensitivities through the Jacobian of the neuromapping is proposed. Our technique is illustrated by the EM-based statistical analysis and yield optimization of an HTS microstrip filter.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130357321","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 : 2001-10-01DOI: 10.1109/EUMA.2001.339166
D. Peroulis, S. Pacheco, K. Sarabandi, L. Katehi
This paper presents two methods for counteracting the unwanted deflection due to warping or buckling effects, which are serious potential problems in many fabrication processes of microelectromechanical (MEMS) structures due to thin film phenomena. This study is primarily suited for electrostatically actuated RF MEMS switches whose RF and DC performance can be significantly deteriorated by out of plane warping. It can also be applied to MEMS accelerometers, resonators and other similar systems. The first technique focuses on modifying the support structure and the spring constant of the switch, while the second involves a more complicated fabrication process, which selectively increases the switch thickness. Both these techniques yield switches with two to ten times less warping under the same fabrication conditions. The second method, however, presents the additional advantage of maintaining the actuation voltage almost unaffected.
{"title":"Alleviating the Adverse Effects of Residual Stress in RF MEMS Switches","authors":"D. Peroulis, S. Pacheco, K. Sarabandi, L. Katehi","doi":"10.1109/EUMA.2001.339166","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339166","url":null,"abstract":"This paper presents two methods for counteracting the unwanted deflection due to warping or buckling effects, which are serious potential problems in many fabrication processes of microelectromechanical (MEMS) structures due to thin film phenomena. This study is primarily suited for electrostatically actuated RF MEMS switches whose RF and DC performance can be significantly deteriorated by out of plane warping. It can also be applied to MEMS accelerometers, resonators and other similar systems. The first technique focuses on modifying the support structure and the spring constant of the switch, while the second involves a more complicated fabrication process, which selectively increases the switch thickness. Both these techniques yield switches with two to ten times less warping under the same fabrication conditions. The second method, however, presents the additional advantage of maintaining the actuation voltage almost unaffected.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129850962","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 : 2001-10-01DOI: 10.1109/EUMA.2001.339187
M. Wollitzer, S. Thies, S. Schott
The development of coaxial and planar RF measurement systems demands a completely different approach as currently used in the low frequency field. In order to achieve minimum reflections in an RF cable, a defined wave resistance must be kept up along its whole length. It is therefore of primary importance to choose appropriate manufacturing techniques, in this case micromachining, after a thorough analysis of all possibilities for HF transmission. We will show that applying these principles to the tips used to contact planar circuits results in the smallest possible impairment to the signals to be transferred.
{"title":"New Probing Technology Now Enables Impedance Controlled On-Wafer Probing","authors":"M. Wollitzer, S. Thies, S. Schott","doi":"10.1109/EUMA.2001.339187","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339187","url":null,"abstract":"The development of coaxial and planar RF measurement systems demands a completely different approach as currently used in the low frequency field. In order to achieve minimum reflections in an RF cable, a defined wave resistance must be kept up along its whole length. It is therefore of primary importance to choose appropriate manufacturing techniques, in this case micromachining, after a thorough analysis of all possibilities for HF transmission. We will show that applying these principles to the tips used to contact planar circuits results in the smallest possible impairment to the signals to be transferred.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"LIX 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126072684","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 : 2001-10-01DOI: 10.1109/EUMA.2001.339189
Huang Yajian, A. Alphones
An analysis of the AC characteristics of Al-GaAs/GaAs HEMT under illumination with modulated light has been carried out for small signal condition. A new model for the photovoltage calculation is outlined. The effect of the signal frequency on the photoconductive current is evaluated, the results show that photoconductive current is very small and can be neglected in calculation. The frequency dependence of photovoltage along with 2-DEG charge density, drain-source current and transconductance of the device have been studied analytically for HEMT structure.
{"title":"Frequency Dependence of HEMT Under Optical Illumination","authors":"Huang Yajian, A. Alphones","doi":"10.1109/EUMA.2001.339189","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339189","url":null,"abstract":"An analysis of the AC characteristics of Al-GaAs/GaAs HEMT under illumination with modulated light has been carried out for small signal condition. A new model for the photovoltage calculation is outlined. The effect of the signal frequency on the photoconductive current is evaluated, the results show that photoconductive current is very small and can be neglected in calculation. The frequency dependence of photovoltage along with 2-DEG charge density, drain-source current and transconductance of the device have been studied analytically for HEMT structure.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127264470","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 : 2001-10-01DOI: 10.1109/EUMA.2001.339085
J. Zehentner, J. Macháč, P. Lorenz, J. Mrkvica
This paper discusses investigations of leaky wave radiation from the slotline made on a low permittivity substrate. New findings on the field distribution of the space leaky wave propagating on a slotline with a wide slot are presented. The design of the antenna and its measured parameters are introduced, along with practical experience acquired experimentally.
{"title":"Planar Slot-Patch Antenna","authors":"J. Zehentner, J. Macháč, P. Lorenz, J. Mrkvica","doi":"10.1109/EUMA.2001.339085","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339085","url":null,"abstract":"This paper discusses investigations of leaky wave radiation from the slotline made on a low permittivity substrate. New findings on the field distribution of the space leaky wave propagating on a slotline with a wide slot are presented. The design of the antenna and its measured parameters are introduced, along with practical experience acquired experimentally.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114317445","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 : 2001-10-01DOI: 10.1109/EUMA.2001.339106
L. Casavola, O. Bucci, M. Migliore, A. Ziyyat, D. Picard, J. Bolomey
A new technique to rapidly evaluate the near-field and the safety perimeter of a base station antenna is reported in this paper. It consists in the reconstruction of the near-field in a volume surrounding the antenna from a standard near-field measurement on a cylindrical surface. The truncation error in near-field reconstruction, due to the finite size of the measurement cylinder, is analysed. An extrapolation technique, which takes into account the a-priori information on the geometry of the antenna, is shown to reduce the truncation error.
{"title":"Reduction of Truncation Error in Near-Field to Near-Field Transformation","authors":"L. Casavola, O. Bucci, M. Migliore, A. Ziyyat, D. Picard, J. Bolomey","doi":"10.1109/EUMA.2001.339106","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339106","url":null,"abstract":"A new technique to rapidly evaluate the near-field and the safety perimeter of a base station antenna is reported in this paper. It consists in the reconstruction of the near-field in a volume surrounding the antenna from a standard near-field measurement on a cylindrical surface. The truncation error in near-field reconstruction, due to the finite size of the measurement cylinder, is analysed. An extrapolation technique, which takes into account the a-priori information on the geometry of the antenna, is shown to reduce the truncation error.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122434526","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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