Pub Date : 2001-10-01DOI: 10.1109/EUMA.2001.339047
L. Accatino, F. Muoio, B. Piovano, G. Caille, M. Mongiardo
Modern CAD tools make feasible to perform an integrated design of microwave networks that accounts also for mechanical and thermal constraints. In this contribution we examine the application of such design approach to Butler matrices, frequently employed in advanced satellite antennas. By using the proposed technique it is shown that Butler matrices implemented in nonstandard waveguide and with compensated bends in order to reduce size and weight can successfully rival microstrip implementations at X-band and pave the way to sophisticated antenna designs at Ka-band.
{"title":"CAD of Waveguide Butler Matrices Including Mechanical and Thermal Constraints","authors":"L. Accatino, F. Muoio, B. Piovano, G. Caille, M. Mongiardo","doi":"10.1109/EUMA.2001.339047","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339047","url":null,"abstract":"Modern CAD tools make feasible to perform an integrated design of microwave networks that accounts also for mechanical and thermal constraints. In this contribution we examine the application of such design approach to Butler matrices, frequently employed in advanced satellite antennas. By using the proposed technique it is shown that Butler matrices implemented in nonstandard waveguide and with compensated bends in order to reduce size and weight can successfully rival microstrip implementations at X-band and pave the way to sophisticated antenna designs at Ka-band.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"68 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":"125828352","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.2001.339029
P. Harscher, S. Amari, R. Vahldieck
In this paper a technique for computer diagnosis and optimization of microwave filters is presented. A reduced prototype network is used which contains only the minimum number of parameters that are necessary to model a measured filter under test. The exact parameter values (resonant frequencies of resonators and coupling coefficients) of a de-tuned filter are extracted from measured complex S-parameters (diagnosis). In a sensitivity analysis the electrical characteristics of tunable elements (e.g. screws) are found. A final optimization delivers the optimized screw positions that have to be adjusted to obtain a tuned filter response.
{"title":"Computer Diagnosis and Optimization of Microwave Filters","authors":"P. Harscher, S. Amari, R. Vahldieck","doi":"10.1109/EUMA.2001.339029","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339029","url":null,"abstract":"In this paper a technique for computer diagnosis and optimization of microwave filters is presented. A reduced prototype network is used which contains only the minimum number of parameters that are necessary to model a measured filter under test. The exact parameter values (resonant frequencies of resonators and coupling coefficients) of a de-tuned filter are extracted from measured complex S-parameters (diagnosis). In a sensitivity analysis the electrical characteristics of tunable elements (e.g. screws) are found. A final optimization delivers the optimized screw positions that have to be adjusted to obtain a tuned filter response.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"38 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":"126756856","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.2001.338942
P. Yudin, M. Nikol’ski, O. Vendik, S. Zubko, I. Vendik
A procedure of extracting model parametrs of a ferroelectric thin film from the experimental characteristics of the capacitance and the loss tangent of a planar capacitor is proposed. It is based on a correct phenomenological model of the capacitance and the loss tangent of the planar capacitor containing the ferroelectric thin film. The calculation of the model parameters was realized by Monte Carlo method based on properties of the quasi-random sequences. The software allows calculating capacitance and loss tangent of the planar capacitor as a function of temperature and biasing field. The model is used for a development of a CAD tool intended for a design of tunable microwave devices based on ferroelectric films.
{"title":"Extracting the Model Parametrs of Ferroelectric Thin Film from the Experimental Characteristics of the Capacitance of a Planar Capacitor","authors":"P. Yudin, M. Nikol’ski, O. Vendik, S. Zubko, I. Vendik","doi":"10.1109/EUMA.2001.338942","DOIUrl":"https://doi.org/10.1109/EUMA.2001.338942","url":null,"abstract":"A procedure of extracting model parametrs of a ferroelectric thin film from the experimental characteristics of the capacitance and the loss tangent of a planar capacitor is proposed. It is based on a correct phenomenological model of the capacitance and the loss tangent of the planar capacitor containing the ferroelectric thin film. The calculation of the model parameters was realized by Monte Carlo method based on properties of the quasi-random sequences. The software allows calculating capacitance and loss tangent of the planar capacitor as a function of temperature and biasing field. The model is used for a development of a CAD tool intended for a design of tunable microwave devices based on ferroelectric films.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"31 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":"131235083","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.2001.339018
J. Pérez, J. Basterrechea
A method for echo cancelling in a screened room is presented in this work. The method obtains an Antenna Under Test (AUT) radiation pattern in terms of a set of infinitesimal electric and/or magnetic dipoles, placed on the surface of a volume containing the AUT. For this purpose, some measured near-field samples taken around the antenna and a genetic algorithm (GA) based optimisation process are used to find the set of dipoles that best fits the near-field samples. Radiation pattern can be estimated for the AUT using this set of dipoles.
{"title":"Genetic Algorithms for Predicting Antenna Radiation Patterns from Near-Field Measurements in a Screened Room","authors":"J. Pérez, J. Basterrechea","doi":"10.1109/EUMA.2001.339018","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339018","url":null,"abstract":"A method for echo cancelling in a screened room is presented in this work. The method obtains an Antenna Under Test (AUT) radiation pattern in terms of a set of infinitesimal electric and/or magnetic dipoles, placed on the surface of a volume containing the AUT. For this purpose, some measured near-field samples taken around the antenna and a genetic algorithm (GA) based optimisation process are used to find the set of dipoles that best fits the near-field samples. Radiation pattern can be estimated for the AUT using this set of dipoles.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"48 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":"127851516","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.2001.339149
M. Condon
A new approach is presented for the transient simulation of lossy transmission lines in high-speed circuits. The approach is based on developing a model for the transmission line which is structured around natural modes of oscillation unlike other transmission-line models which are based on travelling waves. The principal advantage of the new approach is that conversion of frequency-domain prototype models for the transmission lines to the time domain for use in circuit simulators is particularly straightforward and obviates the need for numerical convolution. An illustrative case is given to confirm the efficacy of the new approach.
{"title":"A New Technique for the Transient Simulation of Transmission Lines Inclusive of Skin Effect","authors":"M. Condon","doi":"10.1109/EUMA.2001.339149","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339149","url":null,"abstract":"A new approach is presented for the transient simulation of lossy transmission lines in high-speed circuits. The approach is based on developing a model for the transmission line which is structured around natural modes of oscillation unlike other transmission-line models which are based on travelling waves. The principal advantage of the new approach is that conversion of frequency-domain prototype models for the transmission lines to the time domain for use in circuit simulators is particularly straightforward and obviates the need for numerical convolution. An illustrative case is given to confirm the efficacy of the new approach.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"4 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":"129184392","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.2001.339155
A. Alphones, Wong Kai Yee
A simulation program is developed based on Grover's formulas and Greenhouse method to calculate the inductance value and Q-factor for particular dimension and width distribution of spiral inductors. This program changes the width distribution through a predetermined number of quadratic distributions in an attempt to reduce energy losses and improve Q-factor. The result of this program provides a higher Q-factor together with the possibility of reducing the overall dimension of square spiral inductors as compared with conventional designs. The coordinates of dimension for the simulated inductor are also calculated enabling ease of verification and fabrication. Finally, the calculated results are verified by simulating the inductor using HPADS momentum which is MOM based electromagnetic simulator. The ease of use and rapid results of this program can find its attractiveness in wireless communications and related areas.
{"title":"Optimization of Spiral Inductor on Silicon","authors":"A. Alphones, Wong Kai Yee","doi":"10.1109/EUMA.2001.339155","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339155","url":null,"abstract":"A simulation program is developed based on Grover's formulas and Greenhouse method to calculate the inductance value and Q-factor for particular dimension and width distribution of spiral inductors. This program changes the width distribution through a predetermined number of quadratic distributions in an attempt to reduce energy losses and improve Q-factor. The result of this program provides a higher Q-factor together with the possibility of reducing the overall dimension of square spiral inductors as compared with conventional designs. The coordinates of dimension for the simulated inductor are also calculated enabling ease of verification and fabrication. Finally, the calculated results are verified by simulating the inductor using HPADS momentum which is MOM based electromagnetic simulator. The ease of use and rapid results of this program can find its attractiveness in wireless communications and related areas.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"16 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":"128595433","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.2001.338921
M. Bakr, W. Hoefer
We present a novel approach to electromagnetic synthesis of microwave structures. A standard field analysis obtains the structure response and the field distribution on the optimizable boundary parts of a starting geometry. A number of characteristic frequencies that correspond to the degrees of freedom of the structure are determined. For each degree of freedom a synthesis phase is performed. In this phase the corresponding boundary parts are replaced by matched sinusoidal sources with the desired value of the associated characteristic frequency. The new geometry is then obtained by examining the field envelope pattern.
{"title":"Electromagnetic Synthesis: A Novel Concept in Microwave Design","authors":"M. Bakr, W. Hoefer","doi":"10.1109/EUMA.2001.338921","DOIUrl":"https://doi.org/10.1109/EUMA.2001.338921","url":null,"abstract":"We present a novel approach to electromagnetic synthesis of microwave structures. A standard field analysis obtains the structure response and the field distribution on the optimizable boundary parts of a starting geometry. A number of characteristic frequencies that correspond to the degrees of freedom of the structure are determined. For each degree of freedom a synthesis phase is performed. In this phase the corresponding boundary parts are replaced by matched sinusoidal sources with the desired value of the associated characteristic frequency. The new geometry is then obtained by examining the field envelope pattern.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"2 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":"116859878","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.2001.339100
A. Martinez-Gonzalez, Angel Fernandez-Pascual, D. Sánchez-Hernández
The problem of solving the electromagnetic interaction between radiotelephones for mobile communications and human tissue has been widely analysed in many diverse studies available in literature. Electromagnetic dosimetry is still the subject of many research efforts due to the large number of variables involved in the process. In this sense, the growing public concern regarding human exposure to EM fields has lead to a wide range of `absorbent' gaskets available in the market. In this paper, SAR values for several commercial handsets with and without `absorbent' gaskets have been obtained in an ENAC certified semi-anechoic chamber. Results clearly show that no absorbing effect is observed for the gaskets.
{"title":"E-Field Measurements and SAR evaluation of EMF absorbent gaskets for commercial GSM handsets","authors":"A. Martinez-Gonzalez, Angel Fernandez-Pascual, D. Sánchez-Hernández","doi":"10.1109/EUMA.2001.339100","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339100","url":null,"abstract":"The problem of solving the electromagnetic interaction between radiotelephones for mobile communications and human tissue has been widely analysed in many diverse studies available in literature. Electromagnetic dosimetry is still the subject of many research efforts due to the large number of variables involved in the process. In this sense, the growing public concern regarding human exposure to EM fields has lead to a wide range of `absorbent' gaskets available in the market. In this paper, SAR values for several commercial handsets with and without `absorbent' gaskets have been obtained in an ENAC certified semi-anechoic chamber. Results clearly show that no absorbing effect is observed for the gaskets.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"44 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":"115369630","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.2001.339080
S. I. Bragin, I. Bragin, V. P. Sgibnev, A. A. Morozov, V. Gusevsky, Y. Bragina, A. Zerrouk
The paper deals with some grounding in theory of a passive radiometric complex designed to detect from a helicopter metal and non-metal objects in the soil at the depth of several metres. Experimental results obtained during tests of a complex prototype are presented as well. The complex can be applied in construction and repair works to detect underground utility systems. The complex is of particular interest for the detection of land mines which armed conflicts are left after their completion.
{"title":"Applications of Passive Microwave Devices for Imaging System Designed for Detecting Objects in Soils","authors":"S. I. Bragin, I. Bragin, V. P. Sgibnev, A. A. Morozov, V. Gusevsky, Y. Bragina, A. Zerrouk","doi":"10.1109/EUMA.2001.339080","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339080","url":null,"abstract":"The paper deals with some grounding in theory of a passive radiometric complex designed to detect from a helicopter metal and non-metal objects in the soil at the depth of several metres. Experimental results obtained during tests of a complex prototype are presented as well. The complex can be applied in construction and repair works to detect underground utility systems. The complex is of particular interest for the detection of land mines which armed conflicts are left after their completion.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"13 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":"115426145","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.2001.339120
S. Hrabar, W. Balachandran, J. Bartolić
The worst-case electromagnetic coupling between a 900 MHz mobile telephone and implanted pacemaker with unipolar catheter was investigated by computer simulation. The model comprises a dielectric block with embedded pacemaker and a half-wavelength dipole situated above the surface. A pacemaker connector was modelled as a small loop and a catheter as the lossy transmission line. This model was combined with Finite Difference Time Domain calculation of the field induced within dielectric block. The analysis with 2W transmitter gave the peak interference voltage of 1 V for the connector and 0.3 V for the catheter. These results show that the pacemaker connector is more responsible for coupling than a catheter which agrees with previously published experimental results.
{"title":"Analysis of Coupling Between 900 MHz Mobile Telephone and Implanted Pacemaker","authors":"S. Hrabar, W. Balachandran, J. Bartolić","doi":"10.1109/EUMA.2001.339120","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339120","url":null,"abstract":"The worst-case electromagnetic coupling between a 900 MHz mobile telephone and implanted pacemaker with unipolar catheter was investigated by computer simulation. The model comprises a dielectric block with embedded pacemaker and a half-wavelength dipole situated above the surface. A pacemaker connector was modelled as a small loop and a catheter as the lossy transmission line. This model was combined with Finite Difference Time Domain calculation of the field induced within dielectric block. The analysis with 2W transmitter gave the peak interference voltage of 1 V for the connector and 0.3 V for the catheter. These results show that the pacemaker connector is more responsible for coupling than a catheter which agrees with previously published experimental results.","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":"114518969","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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