Pub Date : 1994-10-01DOI: 10.1109/EUMA.1994.337327
C. Mroczkowski, M. Celuch-Marcysiak, W. Gwarek
The paper presents joint application of superabsorption and near-to-far field transform to the vector 2D FDTD method for the analysis of axisymmetrical antennas. The superabsorbing operator is originally extended to apply to vector 2D modelling. The near-to-far field transform is specially reformulated to take into account the assumed azimuthal field distribution. Theoretical studies and practical examples confirm remarkable effectiveness and accuracy of the method for the analysis of axisymmetrical antennas of arbitrarily shaped and filled long-section.
{"title":"Joint Application of Superabsorption and Near-to-Far Field Transform to FDTD Analysis of Axisymmetrical Antennas","authors":"C. Mroczkowski, M. Celuch-Marcysiak, W. Gwarek","doi":"10.1109/EUMA.1994.337327","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337327","url":null,"abstract":"The paper presents joint application of superabsorption and near-to-far field transform to the vector 2D FDTD method for the analysis of axisymmetrical antennas. The superabsorbing operator is originally extended to apply to vector 2D modelling. The near-to-far field transform is specially reformulated to take into account the assumed azimuthal field distribution. Theoretical studies and practical examples confirm remarkable effectiveness and accuracy of the method for the analysis of axisymmetrical antennas of arbitrarily shaped and filled long-section.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115645421","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337463
J. Mollier, M. Chaubet, J. Sage, Y. Aubry, A. Roizès
To demonstrate the faisability of a new heterodyning process for a wind Lidar, we have, characterized Hg Cd Te photodetectors cooled at liquid nitrogen temperature, illuminated by two laser beams and pumped by an RF signal. Optical and microwave test bench and some experimental results are presented.
{"title":"\"Lightwave - Microwave Characterization of Cooled HG CD TE Photodetectors for Spaceborne Wind Lidars\"","authors":"J. Mollier, M. Chaubet, J. Sage, Y. Aubry, A. Roizès","doi":"10.1109/EUMA.1994.337463","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337463","url":null,"abstract":"To demonstrate the faisability of a new heterodyning process for a wind Lidar, we have, characterized Hg Cd Te photodetectors cooled at liquid nitrogen temperature, illuminated by two laser beams and pumped by an RF signal. Optical and microwave test bench and some experimental results are presented.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"235 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124290007","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337486
J. Nin, Y. Tao, J. Z. Xu, X. G. Li
The design, construction and performance of an extremely low power drain and a small portable all solid -state millimeter wave pulse Doppler radar sensor operating at 35 GHz are described, which can be used for short distance safety warning system in building or vehicle surveillance system in freeway and similarly structured traffic environments. Two prototypes are fabricated with only 1 Watt power consumption, and the experiment results are also presented.
{"title":"A Portable Solid-State Millimeter-Wave Pulse Doppler Radar Sensor Adapted for Short Distance Safety Warning System","authors":"J. Nin, Y. Tao, J. Z. Xu, X. G. Li","doi":"10.1109/EUMA.1994.337486","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337486","url":null,"abstract":"The design, construction and performance of an extremely low power drain and a small portable all solid -state millimeter wave pulse Doppler radar sensor operating at 35 GHz are described, which can be used for short distance safety warning system in building or vehicle surveillance system in freeway and similarly structured traffic environments. Two prototypes are fabricated with only 1 Watt power consumption, and the experiment results are also presented.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121098184","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337372
G. Macchiarella, G. Stracca, M. Politi
The paper describes a new CAD procedure for designing bandpass filters realized with ring or cylindrical dielectric resonators (DRs) placed in circular waveguide below cutoff and operating on the first TE or TM or Hybrid resonance. The procedure employs an equivalent circuit of the filter structure in order to allow a synthesis approach to the design; the results obtained are however very satisfactory even for moderate bandwidth filters. The characterization of DR inside the circular waveguide is performed by means of mode matching techniques, which allow a very accurate evaluation of the equivalent circuit parameters. Experimental measurements performed on a prototype TM filter designed with the proposed procedure have shown substantial agreement with the expected performances.
{"title":"Computer Aided Design of Dielectric Resonators Filters in Circular Waveguide","authors":"G. Macchiarella, G. Stracca, M. Politi","doi":"10.1109/EUMA.1994.337372","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337372","url":null,"abstract":"The paper describes a new CAD procedure for designing bandpass filters realized with ring or cylindrical dielectric resonators (DRs) placed in circular waveguide below cutoff and operating on the first TE or TM or Hybrid resonance. The procedure employs an equivalent circuit of the filter structure in order to allow a synthesis approach to the design; the results obtained are however very satisfactory even for moderate bandwidth filters. The characterization of DR inside the circular waveguide is performed by means of mode matching techniques, which allow a very accurate evaluation of the equivalent circuit parameters. Experimental measurements performed on a prototype TM filter designed with the proposed procedure have shown substantial agreement with the expected performances.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127071948","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337276
R. Sadeghzadeh, M. S. Abrishamian, N. McEwan
It is shown that, by approximating a human head as a dielectric sphere, the method of spherical wave expansions can be used to obtain useful predictions of interactions between the head and an adjacent handset antenna working at about 2 GHz. The fields are computed by an essentially analytical method based on spherical wave expansions. The intention is to obtain an approximate, computationally efficient, tool which could be used for antenna engineering, and it is fully accepted that fine structure in head, and the effect of the neck and body, would be neglected. This work is therefore complementary to those studies using very accurate head models.
{"title":"Effect of User Head on Mobile Telephone Handset Antenna Impedance and Head Internal Fields Distribution","authors":"R. Sadeghzadeh, M. S. Abrishamian, N. McEwan","doi":"10.1109/EUMA.1994.337276","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337276","url":null,"abstract":"It is shown that, by approximating a human head as a dielectric sphere, the method of spherical wave expansions can be used to obtain useful predictions of interactions between the head and an adjacent handset antenna working at about 2 GHz. The fields are computed by an essentially analytical method based on spherical wave expansions. The intention is to obtain an approximate, computationally efficient, tool which could be used for antenna engineering, and it is fully accepted that fine structure in head, and the effect of the neck and body, would be neglected. This work is therefore complementary to those studies using very accurate head models.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127241629","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337345
V. Bilik, J. Bezek
A six-port reflectometer covering the frequency range 2.2 - 2.7 GHz based on SMD technology is described. The principle of operation, basic parameters, constuction and experimental results are presented. The system, built as an extension to a personal computer, is primarily intended for accurate tuning of coaxial or waveguide loads and for setting of magnetron operating points.
{"title":"Vector Reflectometer System for Industrial Applications","authors":"V. Bilik, J. Bezek","doi":"10.1109/EUMA.1994.337345","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337345","url":null,"abstract":"A six-port reflectometer covering the frequency range 2.2 - 2.7 GHz based on SMD technology is described. The principle of operation, basic parameters, constuction and experimental results are presented. The system, built as an extension to a personal computer, is primarily intended for accurate tuning of coaxial or waveguide loads and for setting of magnetron operating points.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125890791","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337475
F. Ares, S. Rengarajan, E. Moreno
A method is described for synthesis of planar array antenna patterns where both the configuration and the excitation (always pure real) of each radiating element is-determined to achieve the design specifications (desired contour, ripple amplitude and sidelobes of controlled height). The method is based on a repetitive optimization procedure that obtains a very important reduction in the number of elements required (establishing a significant improvement in the aperture efficiency) with respect to the corresponding technique described in [2-3].
{"title":"An Improved Planar Array Pattern Synthesis for Space Communication Applications","authors":"F. Ares, S. Rengarajan, E. Moreno","doi":"10.1109/EUMA.1994.337475","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337475","url":null,"abstract":"A method is described for synthesis of planar array antenna patterns where both the configuration and the excitation (always pure real) of each radiating element is-determined to achieve the design specifications (desired contour, ripple amplitude and sidelobes of controlled height). The method is based on a repetitive optimization procedure that obtains a very important reduction in the number of elements required (establishing a significant improvement in the aperture efficiency) with respect to the corresponding technique described in [2-3].","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125286811","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337423
N. Imai, S. Banba, E. Suematsu, H. Sawada
This paper describes millimeter-wave fiber optic technologies for subcarrier transmission systems to be used for future mobile systems. In addition, the system concept and several fundamental technologies needed for these subcarrier transmission systems are described. It is expected that these microcellular systems will require many radio base stations, so miniaturization of the stations-should be conisidered. Monolithic integrated circuits are expected to be one of the key technologies used in system constructions. The characteristics of a millimeter-wave monolithic integrated circuit using a novel multilayer configuration and those of a newly-developed optical receiver are described. In addition, the characteristics of a millimeter-wave fiber optic link are experimentally examined.
{"title":"Millimeter-wave fiber optic technologies for subcarrier transmission systems","authors":"N. Imai, S. Banba, E. Suematsu, H. Sawada","doi":"10.1109/EUMA.1994.337423","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337423","url":null,"abstract":"This paper describes millimeter-wave fiber optic technologies for subcarrier transmission systems to be used for future mobile systems. In addition, the system concept and several fundamental technologies needed for these subcarrier transmission systems are described. It is expected that these microcellular systems will require many radio base stations, so miniaturization of the stations-should be conisidered. Monolithic integrated circuits are expected to be one of the key technologies used in system constructions. The characteristics of a millimeter-wave monolithic integrated circuit using a novel multilayer configuration and those of a newly-developed optical receiver are described. In addition, the characteristics of a millimeter-wave fiber optic link are experimentally examined.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122409003","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337489
G. Boscagli, M. Comparini, R. Giordani, M. Martone
On-board signal acquisition is a fundamental task for deep space missions when telecommand and/or ranging functions must be implemented Local oscillator frequency instabilities and Doppler contribution cause a frequency offset of the carrier at the receiver input. Two different strategies to allow carrier loop acquisition are reported and compared: on-ground sweeping and on-board frequency aided acquisition. A trade-off based on the acquisition time and the acquisition probability addresses the on-ground sweeping procedure as less efficient with respect to the frequency aided solution for the case of weak signal and wide frequency offset. As regards frequency aided acquisition, two different frequency estimation algorithms are considered, one is based on the classical Fast Fourier Transform (FFT), the other one on an Auto Regressive (AR) Estimation for power spectrum evaluation. Theoretical evaluations via analysis and simulation are proposed together with the experimental results obtained both on the Ka Translator for the Cassini mission and the Huygens Receiver for the Cassini-Huygens mission.
{"title":"On-Board Signal Acquisition Strategies for Deep Space Transponders","authors":"G. Boscagli, M. Comparini, R. Giordani, M. Martone","doi":"10.1109/EUMA.1994.337489","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337489","url":null,"abstract":"On-board signal acquisition is a fundamental task for deep space missions when telecommand and/or ranging functions must be implemented Local oscillator frequency instabilities and Doppler contribution cause a frequency offset of the carrier at the receiver input. Two different strategies to allow carrier loop acquisition are reported and compared: on-ground sweeping and on-board frequency aided acquisition. A trade-off based on the acquisition time and the acquisition probability addresses the on-ground sweeping procedure as less efficient with respect to the frequency aided solution for the case of weak signal and wide frequency offset. As regards frequency aided acquisition, two different frequency estimation algorithms are considered, one is based on the classical Fast Fourier Transform (FFT), the other one on an Auto Regressive (AR) Estimation for power spectrum evaluation. Theoretical evaluations via analysis and simulation are proposed together with the experimental results obtained both on the Ka Translator for the Cassini mission and the Huygens Receiver for the Cassini-Huygens mission.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122904064","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337384
H. Roussel, F. Jouvie, W. Tabbara
A periodic set of parallel dielectric fibers is embedded in a lossless dielectric slab backed by an infinitely conducting plane. The period of the grating is such that only the zero order mode exists. Then the array behaves like a homogeneous medium. Each fiber is quasi-randomly distributed in the reference cell. We compare the average reflectivity obtained by the integral representation to a homogenization approach.
{"title":"Reflection from a Grating of Quasi-Randomly Distributed Fibers. Integral Equation Representation vs. Homogenization Approach","authors":"H. Roussel, F. Jouvie, W. Tabbara","doi":"10.1109/EUMA.1994.337384","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337384","url":null,"abstract":"A periodic set of parallel dielectric fibers is embedded in a lossless dielectric slab backed by an infinitely conducting plane. The period of the grating is such that only the zero order mode exists. Then the array behaves like a homogeneous medium. Each fiber is quasi-randomly distributed in the reference cell. We compare the average reflectivity obtained by the integral representation to a homogenization approach.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129464702","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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