Pub Date : 2015-04-22DOI: 10.1109/COMITE.2015.7120342
V. Schejbal, R. Dolecek, V. Závodný, Petr Kopecký, O. Fiser
The design of completely rebuilt antenna far-field range is described. The results of new measurement campaign are given for various cases. The paper analyzes briefly electromagnetic wave propagation over irregular terrain by physical optics approximation of vector problem using an enhanced analysis. The comparison of numerical simulations and measurements for the new far-field range is given.
{"title":"Far-field antenna range","authors":"V. Schejbal, R. Dolecek, V. Závodný, Petr Kopecký, O. Fiser","doi":"10.1109/COMITE.2015.7120342","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120342","url":null,"abstract":"The design of completely rebuilt antenna far-field range is described. The results of new measurement campaign are given for various cases. The paper analyzes briefly electromagnetic wave propagation over irregular terrain by physical optics approximation of vector problem using an enhanced analysis. The comparison of numerical simulations and measurements for the new far-field range is given.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122987854","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120337
V. Závodný, Petr Kopecký
The paper deals with a simulation of dipole antenna array. An omnidirectional antenna characteristic in the azimuthal plane is created. Vertical plane consists of antenna characteristics with cosecant beam shape. Efficient interconnection between program AWR and CST were used to optimize the antenna characteristics.
{"title":"Omnidirectional antenna co-simulation","authors":"V. Závodný, Petr Kopecký","doi":"10.1109/COMITE.2015.7120337","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120337","url":null,"abstract":"The paper deals with a simulation of dipole antenna array. An omnidirectional antenna characteristic in the azimuthal plane is created. Vertical plane consists of antenna characteristics with cosecant beam shape. Efficient interconnection between program AWR and CST were used to optimize the antenna characteristics.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"339 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122644070","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120314
T. Shejbal
The paper deals with angular resolution of phased antenna arrays and with methods of better angular resolution based on spectral estimation in the case of two close targets. Angular resolution with continuous scanning is dependent mainly on the angle distance between two close targets. Angular resolution with electronic scanning is not dependent only on the distance between two close targets, but also on the step size angle and starting point angle of scanning. It is possible to achieve better angular resolution by methods of direction of arrival (DOA). This paper presents DOA analysis of angular resolution of these methods: Capon, Pisarenko, MUSIC and ESPRIT.
{"title":"Improvement methods of angular resolution of antenna array","authors":"T. Shejbal","doi":"10.1109/COMITE.2015.7120314","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120314","url":null,"abstract":"The paper deals with angular resolution of phased antenna arrays and with methods of better angular resolution based on spectral estimation in the case of two close targets. Angular resolution with continuous scanning is dependent mainly on the angle distance between two close targets. Angular resolution with electronic scanning is not dependent only on the distance between two close targets, but also on the step size angle and starting point angle of scanning. It is possible to achieve better angular resolution by methods of direction of arrival (DOA). This paper presents DOA analysis of angular resolution of these methods: Capon, Pisarenko, MUSIC and ESPRIT.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125410358","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120317
Adam Szullo, J. Orban, G. Mikó
This paper presents how a developed multichannel vector network analyzer, combined with the near-field measurement method, can significantly increase the reliability of surveillance services to air traffic control, by providing a faster measurement potential of the radar antenna's radiation pattern. A systematic radiation pattern check is vital to maintain the expected radar performance and safe operation.
{"title":"Development of a multichannel vector network analyzer for \"In Situ\" measurement of radar antennas","authors":"Adam Szullo, J. Orban, G. Mikó","doi":"10.1109/COMITE.2015.7120317","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120317","url":null,"abstract":"This paper presents how a developed multichannel vector network analyzer, combined with the near-field measurement method, can significantly increase the reliability of surveillance services to air traffic control, by providing a faster measurement potential of the radar antenna's radiation pattern. A systematic radiation pattern check is vital to maintain the expected radar performance and safe operation.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128165391","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120225
P. Hubka, J. Lacik
In this paper, a linearly polarized half-mode substrate integrated waveguide (HMSIW) U-slot antenna is proposed. It is based on a combination of U-shaped slot etched in the HMSIW top wall and two shorts placed in this slot. Thanks to this configuration, a linearly polarized antenna with maximum radiation in the normal direction is obtained. The antenna is designed for the operating frequency band of 10 GHz with help of CST Microwave Studio. Experimental results prove that the antenna with a HMSIW-to-GCPW (grounded coplanar waveguide) transition radiates linearly polarized electromagnetic wave and achieves the impedance bandwidth of 3.2 % for reflection coefficient less than -10 dB and gain of 6.01 dBi.
{"title":"Linearly polarized HMSIW U-slot antenna","authors":"P. Hubka, J. Lacik","doi":"10.1109/COMITE.2015.7120225","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120225","url":null,"abstract":"In this paper, a linearly polarized half-mode substrate integrated waveguide (HMSIW) U-slot antenna is proposed. It is based on a combination of U-shaped slot etched in the HMSIW top wall and two shorts placed in this slot. Thanks to this configuration, a linearly polarized antenna with maximum radiation in the normal direction is obtained. The antenna is designed for the operating frequency band of 10 GHz with help of CST Microwave Studio. Experimental results prove that the antenna with a HMSIW-to-GCPW (grounded coplanar waveguide) transition radiates linearly polarized electromagnetic wave and achieves the impedance bandwidth of 3.2 % for reflection coefficient less than -10 dB and gain of 6.01 dBi.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124818048","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120334
Petr Kopecký, V. Závodný
This article is focused on using a dielectric resonator as a radiating element of a antenna with the aim to reduce dimensions of such antennas compared to classical microstrip antennas. Such antenna was build and its parameters tested in frequency band of 2.9 to 3.1 GHz.
{"title":"Dielectric resonator antenna","authors":"Petr Kopecký, V. Závodný","doi":"10.1109/COMITE.2015.7120334","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120334","url":null,"abstract":"This article is focused on using a dielectric resonator as a radiating element of a antenna with the aim to reduce dimensions of such antennas compared to classical microstrip antennas. Such antenna was build and its parameters tested in frequency band of 2.9 to 3.1 GHz.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123750819","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120322
Luděk Zaplatílek, M. Pola, P. Bezousek
Precision indoor positioning system intended for fire fighters and members of rescue corps is currently developed at the University of Pardubice. Each team member is equipped with a transmitter, generating a unique UWB OFDM signal in periodic pulses. Around the surveyed building several receiver stations are deployed receiving the UWB signals and measuring their time of arrivals. Several TDOA methods are used namely 2D iterative, 3D iterative and the Ralph Bucher method to extract transmitters' positions. Unfortunately each received signal contains not only a direct signal but also its echoes due to reflections at walls. That is why the signals are at first correlated with the known transmitted signal to obtain a rough estimation of the pulses time positions and then a spectral analysis method (SAM) is applied to separate the direct signal from its echoes to get precise time delay of the direct signal (the pseudorange). In this paper a virtual experiment with a model of this system is described and position accuracy is analyzed.
{"title":"Modeling of precise indoor positioning system","authors":"Luděk Zaplatílek, M. Pola, P. Bezousek","doi":"10.1109/COMITE.2015.7120322","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120322","url":null,"abstract":"Precision indoor positioning system intended for fire fighters and members of rescue corps is currently developed at the University of Pardubice. Each team member is equipped with a transmitter, generating a unique UWB OFDM signal in periodic pulses. Around the surveyed building several receiver stations are deployed receiving the UWB signals and measuring their time of arrivals. Several TDOA methods are used namely 2D iterative, 3D iterative and the Ralph Bucher method to extract transmitters' positions. Unfortunately each received signal contains not only a direct signal but also its echoes due to reflections at walls. That is why the signals are at first correlated with the known transmitted signal to obtain a rough estimation of the pulses time positions and then a spectral analysis method (SAM) is applied to separate the direct signal from its echoes to get precise time delay of the direct signal (the pseudorange). In this paper a virtual experiment with a model of this system is described and position accuracy is analyzed.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126470274","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120318
Y. Yukhanov, I. Merglodov, E. V. Kriuk, T. Privalova, I. Ilyin
This paper represents numerical and experimental studies of multimode waveguide Van-Atta array. It is shown that the use of multimode waveguides under certain conditions, allows to expand the angular sector of monostatic diagram of radar cross-section to the maximum possible value of ±450 relative to the normal to the plane of the array. Radiation pattern of the radiating elements in this case is equal to the radiation pattern of the Huygens element. Conducted research has shown good match between the numerical and experimental data.
{"title":"Numerical and experimental studies of multimode waveguide Van-Atta array","authors":"Y. Yukhanov, I. Merglodov, E. V. Kriuk, T. Privalova, I. Ilyin","doi":"10.1109/COMITE.2015.7120318","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120318","url":null,"abstract":"This paper represents numerical and experimental studies of multimode waveguide Van-Atta array. It is shown that the use of multimode waveguides under certain conditions, allows to expand the angular sector of monostatic diagram of radar cross-section to the maximum possible value of ±450 relative to the normal to the plane of the array. Radiation pattern of the radiating elements in this case is equal to the radiation pattern of the Huygens element. Conducted research has shown good match between the numerical and experimental data.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133257758","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120230
A. L’vov, A. Nikolaenko, P. A. L'vov
A new technique for parameters measurement of microwave loads is presented in the paper. The method based on combined multi-port reflectometer with subsequent down conversion of measuring frequency inherent to vector voltmeter. The basic measuring equations of the new meter are obtained. The advantages of the proposed meter are discussed and the results of computer simulation of measuring process confirming the theoretical conclusions are given.
{"title":"A novel vector network analyzer using combined multi-port reflectometer","authors":"A. L’vov, A. Nikolaenko, P. A. L'vov","doi":"10.1109/COMITE.2015.7120230","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120230","url":null,"abstract":"A new technique for parameters measurement of microwave loads is presented in the paper. The method based on combined multi-port reflectometer with subsequent down conversion of measuring frequency inherent to vector voltmeter. The basic measuring equations of the new meter are obtained. The advantages of the proposed meter are discussed and the results of computer simulation of measuring process confirming the theoretical conclusions are given.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122372851","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120335
D. Krutilek, Z. Raida
This paper describes necessary adjustments of the original CAD data which are needed to obtain a geometry suitable for meshing. These are general procedures that are based on the experience and knowledge of creator of such models. Furthermore, the paper presents results of models that are meshed with correct and incorrect surface mesh.
{"title":"Optimal meshing for high-frequency analysis of realistic structure","authors":"D. Krutilek, Z. Raida","doi":"10.1109/COMITE.2015.7120335","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120335","url":null,"abstract":"This paper describes necessary adjustments of the original CAD data which are needed to obtain a geometry suitable for meshing. These are general procedures that are based on the experience and knowledge of creator of such models. Furthermore, the paper presents results of models that are meshed with correct and incorrect surface mesh.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122569883","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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