Pub Date : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371424
K. Hájek
The voltage noise of preamplifiers limits a sensitivity of many systems in the case of the low value of an internal resistance of a signal source. The offset and 1/f noise as a special case of this noise can be reduced by some variant of chopping technique as it is known for DC amplifiers. This idea is used for new principle of reducing of the white voltage noise. In comparison to classical chopping technique the suitable synchronous DSP enables to differentiate chopped usable signal from voltage noise with frequencies around chopping frequency.
{"title":"Reduction of the Voltage Noise of Preamplifiers by Chopping Synchronized with DSP","authors":"K. Hájek","doi":"10.1109/RADIOELEK.2007.371424","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371424","url":null,"abstract":"The voltage noise of preamplifiers limits a sensitivity of many systems in the case of the low value of an internal resistance of a signal source. The offset and 1/f noise as a special case of this noise can be reduced by some variant of chopping technique as it is known for DC amplifiers. This idea is used for new principle of reducing of the white voltage noise. In comparison to classical chopping technique the suitable synchronous DSP enables to differentiate chopped usable signal from voltage noise with frequencies around chopping frequency.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125298271","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371490
V. Rícný
The paper deals with the development, realization and results of the measurements of the real television channel simulator, which was developed at the Institute of Radio Electronics, Brno University of Technology for educational and research purposes.
{"title":"Simulator of the Real TV Channel","authors":"V. Rícný","doi":"10.1109/RADIOELEK.2007.371490","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371490","url":null,"abstract":"The paper deals with the development, realization and results of the measurements of the real television channel simulator, which was developed at the Institute of Radio Electronics, Brno University of Technology for educational and research purposes.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129961809","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371469
J. Jerabek, D. Dvorak, J. Mrkvica, R. Sikl
Moving target bistatic 2D UWB radar trial with two receiving antennas using modification of time-domain back-projection technique with use of 50 GHz equivalent sampling oscilloscope in comparison of two channel 1 GHz real time sampler is presented. Sub nanosecond first derivate Gaussian pulse with peak-peak amplitude 1.2 V was used. As a target a metal barrel was chosen and his movement by shifting with 5 cm step simulated. Using real-time sampler was the goal. Acquired data were processed and the radar images shown.
{"title":"Moving Target UWB Radar Demonstration using Real-Time Sampling","authors":"J. Jerabek, D. Dvorak, J. Mrkvica, R. Sikl","doi":"10.1109/RADIOELEK.2007.371469","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371469","url":null,"abstract":"Moving target bistatic 2D UWB radar trial with two receiving antennas using modification of time-domain back-projection technique with use of 50 GHz equivalent sampling oscilloscope in comparison of two channel 1 GHz real time sampler is presented. Sub nanosecond first derivate Gaussian pulse with peak-peak amplitude 1.2 V was used. As a target a metal barrel was chosen and his movement by shifting with 5 cm step simulated. Using real-time sampler was the goal. Acquired data were processed and the radar images shown.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124692887","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371449
W. Zieniutycz
The radiation from microwave integrated circuits (MIC) and millimeter microwave integrated circuits (MMIC) is the object of interests from theoretical and practical points of views. The results of such investigations permit to anticipate the properties of open structures when they are optimized for maximum of radiation (the antenna case) or to minimize of radiation effects (in the most of circuits radiation is parasitic effect). The radiation from microstrip-like waveguiding structure can be represented by means of continuum of so-called hybrid radiation (HR) modes. We showed in the paper that properly chosen single HR mode can be applied to the design of rectangular patch antenna. As an introduction we presented modal analysis of the open dielectric slab waveguide since its modes "built" the em field of microstrip line. For the better understanding of the modes properties of the open slab we started from shielding structure analysis and then a transition to the open structure was made by receding the upper enclosure to infinity. Similar approach was next presented for microstrip-like line using spectral domain representation, however field nonhomogeneity in the strip interface led to hybrid nature of HR modes. We have proposed an additional condition for HR modes and an iterative procedure to find the solution of the problem, which consisted of perturbed EH(y) and HE(y) HR modes in this case. We showed in the next part of the paper that single EH(y) HR mode of microstrip line with the phase constant beta ap 0 could approximate the field of the fundamental mode of the rectangular patch antenna. The approximation was used to determine the resonant frequencies and resistances as well as the radiation pattern of antennas. Our results were compared with data obtained from different models and from professional full-wave simulators. It was found that the proposed model permitted to design antenna basic parameters with reasonable accuracy in reasonable time.
微波集成电路(MIC)和毫米波微波集成电路(MMIC)的辐射从理论和实践上都是人们关注的对象。这种研究的结果允许预测开放式结构的特性，当它们被优化为最大辐射(天线外壳)或最小辐射效应(在大多数电路中，辐射是寄生效应)。类微带波导结构的辐射可以用混合辐射模式的连续体来表示。本文表明，选择合适的单HR模式可以应用于矩形贴片天线的设计。作为介绍，我们对开式介质平板波导进行了模态分析，因为它的模态“构建”了微带线的电磁场。为了更好地理解开板的模态特性，我们从屏蔽结构分析开始，然后通过将上部外壳后退到无限远来过渡到开板结构。接下来，利用谱域表示方法提出了类似的方法，用于微带样线，但是条带界面中的场非均匀性导致了HR模式的杂化性质。我们提出了HR模式的附加条件和求解问题的迭代过程，该问题由扰动EH(y)和HE(y) HR模式组成。在接下来的文章中，我们证明了相位常数为β ap 0的微带线的单EH(y) HR模式可以近似于矩形贴片天线的基模场。该近似方法用于确定天线的谐振频率和电阻以及天线的辐射方向图。我们的结果比较了来自不同模型和专业全波模拟器的数据。结果表明，该模型能够在合理的时间内以合理的精度设计天线基本参数。
{"title":"Application of Hybrid Radiation Modes of Microstrip Line in Rectangular Patch Antennas Design","authors":"W. Zieniutycz","doi":"10.1109/RADIOELEK.2007.371449","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371449","url":null,"abstract":"The radiation from microwave integrated circuits (MIC) and millimeter microwave integrated circuits (MMIC) is the object of interests from theoretical and practical points of views. The results of such investigations permit to anticipate the properties of open structures when they are optimized for maximum of radiation (the antenna case) or to minimize of radiation effects (in the most of circuits radiation is parasitic effect). The radiation from microstrip-like waveguiding structure can be represented by means of continuum of so-called hybrid radiation (HR) modes. We showed in the paper that properly chosen single HR mode can be applied to the design of rectangular patch antenna. As an introduction we presented modal analysis of the open dielectric slab waveguide since its modes \"built\" the em field of microstrip line. For the better understanding of the modes properties of the open slab we started from shielding structure analysis and then a transition to the open structure was made by receding the upper enclosure to infinity. Similar approach was next presented for microstrip-like line using spectral domain representation, however field nonhomogeneity in the strip interface led to hybrid nature of HR modes. We have proposed an additional condition for HR modes and an iterative procedure to find the solution of the problem, which consisted of perturbed EH(y) and HE(y) HR modes in this case. We showed in the next part of the paper that single EH(y) HR mode of microstrip line with the phase constant beta ap 0 could approximate the field of the fundamental mode of the rectangular patch antenna. The approximation was used to determine the resonant frequencies and resistances as well as the radiation pattern of antennas. Our results were compared with data obtained from different models and from professional full-wave simulators. It was found that the proposed model permitted to design antenna basic parameters with reasonable accuracy in reasonable time.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115961868","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371666
L. Dordová, O. Wilfert
Present day optical wireless communication systems work with wavelength of 1550 nm but it is considering whether optical communication at 850 nm offers more benefits. Currently we don't know answer on the question which optical window is more reasonable to use in free space optical links but we try to solve this problem. This paper is focusing on the relation between laser diode operating temperature and spectral linewidth. We select laser diode which emits wavelength of 1550 nm (RLT1550-15G). The point of the research is to examine spectral properties of this laser diode in relation to increasing laser diode operating temperature.
{"title":"Spectral Properties of the Laser Beam in Relation to the Laser Diode Operating Temperature","authors":"L. Dordová, O. Wilfert","doi":"10.1109/RADIOELEK.2007.371666","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371666","url":null,"abstract":"Present day optical wireless communication systems work with wavelength of 1550 nm but it is considering whether optical communication at 850 nm offers more benefits. Currently we don't know answer on the question which optical window is more reasonable to use in free space optical links but we try to solve this problem. This paper is focusing on the relation between laser diode operating temperature and spectral linewidth. We select laser diode which emits wavelength of 1550 nm (RLT1550-15G). The point of the research is to examine spectral properties of this laser diode in relation to increasing laser diode operating temperature.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125904788","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371445
P. Podhoransky, M. Lipovsky, J. Zemanovic, M. Sabo
This paper is focused on analyzing the transfer and the error rate measurement using network variables in LonWorks systems. The measurement was done by using the LonWorks power line modem mini evaluation kit (Mini EVK) feed by a standard RS-232 interface of the personal computer and the special software which was developed for this aim The Mini EVK power line modem contains the PL3150 circuit, which is designed for intelligent buildings control and home automation. The results of a measurement of the transfer and the error rate are presented.
{"title":"Transfer and Error Rate Measurement in the Lon Works Power Line Communication Systems","authors":"P. Podhoransky, M. Lipovsky, J. Zemanovic, M. Sabo","doi":"10.1109/RADIOELEK.2007.371445","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371445","url":null,"abstract":"This paper is focused on analyzing the transfer and the error rate measurement using network variables in LonWorks systems. The measurement was done by using the LonWorks power line modem mini evaluation kit (Mini EVK) feed by a standard RS-232 interface of the personal computer and the special software which was developed for this aim The Mini EVK power line modem contains the PL3150 circuit, which is designed for intelligent buildings control and home automation. The results of a measurement of the transfer and the error rate are presented.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125419233","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371683
P. Kučera, F. Mohr
We develop methods to determine the polarization properties of basic optical devices like retarders and beamsplitters using a Soleil-Babinet compensator. A mathematical description of the optical components is also given. The description is then applied on a coherent state, which represents laser radiation.
{"title":"Methods for Measuring the Polarization Properties of Retarders and Beamsplitters","authors":"P. Kučera, F. Mohr","doi":"10.1109/RADIOELEK.2007.371683","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371683","url":null,"abstract":"We develop methods to determine the polarization properties of basic optical devices like retarders and beamsplitters using a Soleil-Babinet compensator. A mathematical description of the optical components is also given. The description is then applied on a coherent state, which represents laser radiation.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"1079 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116028797","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371481
N. Majer, J. Haring, V. Wieser
In this paper the method for estimation of signals' direction of arrival (DOA) directly at RF frequency without baseband conversion and without demodulation is described. We will estimate DOA by a multiple array of antennas with an array of six-port reflectometers (SPR). To estimate an angle of arrival we have applied the RF receiver with two and three antenna elements connected to two and three SPRs. To illustrate the performance of the proposed receiver, a physical radio channel is modeled without fading, so there exists the line-of-sight connection between the sources and the receivers.
{"title":"DOA Estimation by Six-port Reflectometer Array","authors":"N. Majer, J. Haring, V. Wieser","doi":"10.1109/RADIOELEK.2007.371481","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371481","url":null,"abstract":"In this paper the method for estimation of signals' direction of arrival (DOA) directly at RF frequency without baseband conversion and without demodulation is described. We will estimate DOA by a multiple array of antennas with an array of six-port reflectometers (SPR). To estimate an angle of arrival we have applied the RF receiver with two and three antenna elements connected to two and three SPRs. To illustrate the performance of the proposed receiver, a physical radio channel is modeled without fading, so there exists the line-of-sight connection between the sources and the receivers.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132084240","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371486
J. Papaj, Matus Pleva, A. Čižmár, L. Dobos, J. Juhár, S. Ondáš
In this paper the project MobilTel is presented. The communication itself is becoming a multimodal interactive process. The MobilTel project provides research and development activities in multimodal interfaces area. The result is a functional architecture for mobile multimodal telecommunication systems. The MobilTel communicator is a multimodal Slovak speech and graphical interface. The other possible modalities are pen-touch screen interaction, keyboard, and display on which the information is more user friendly presented (icons, emoticons, etc.), and provides hyperlink and scrolling menu availability. We describe the method of interaction between mobile terminal (PDA) and MobilTel multimodal PC communicator. We also present the graphical examples of services that enable users to obtain information about weather or information about train connection between two train stations.
{"title":"MOBILTEL - Mobile Multimodal Telecommunications Systems and Services","authors":"J. Papaj, Matus Pleva, A. Čižmár, L. Dobos, J. Juhár, S. Ondáš","doi":"10.1109/RADIOELEK.2007.371486","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371486","url":null,"abstract":"In this paper the project MobilTel is presented. The communication itself is becoming a multimodal interactive process. The MobilTel project provides research and development activities in multimodal interfaces area. The result is a functional architecture for mobile multimodal telecommunication systems. The MobilTel communicator is a multimodal Slovak speech and graphical interface. The other possible modalities are pen-touch screen interaction, keyboard, and display on which the information is more user friendly presented (icons, emoticons, etc.), and provides hyperlink and scrolling menu availability. We describe the method of interaction between mobile terminal (PDA) and MobilTel multimodal PC communicator. We also present the graphical examples of services that enable users to obtain information about weather or information about train connection between two train stations.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133759115","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371681
P. Kovács
In this paper, a design of high gain microstrip antenna using planar circularly symmetric electromagnetic band gap structures (PCS-EBG) is presented. The EBG rings round the antenna reduce surface waves propagating along the substrate and support the radiation of electromagnetic (EM) energy in plane perpendicular to the antenna. Because of the circularly symmetry the surface waves are supressed in all radial directions to the same degree. To demonstrate this a panel with six antennas - four without EBG rings, one with two EBG rigs and one with three EBG rings - was modeled and simulated in Zeland IE3D.
{"title":"High Gain Microstrip Antenna Using Planar Circularly Symmetric EBG Structures","authors":"P. Kovács","doi":"10.1109/RADIOELEK.2007.371681","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371681","url":null,"abstract":"In this paper, a design of high gain microstrip antenna using planar circularly symmetric electromagnetic band gap structures (PCS-EBG) is presented. The EBG rings round the antenna reduce surface waves propagating along the substrate and support the radiation of electromagnetic (EM) energy in plane perpendicular to the antenna. Because of the circularly symmetry the surface waves are supressed in all radial directions to the same degree. To demonstrate this a panel with six antennas - four without EBG rings, one with two EBG rigs and one with three EBG rings - was modeled and simulated in Zeland IE3D.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134230265","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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