Pub Date : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371672
P. Hazdra, P. Hamouz, M. Mazanek, S. Zvánovec
The theory of characteristic modes is a very useful tool to get physical insight into antenna behavior. It is possible to easily obtain resonant frequencies, modal radiation Q or bandwidth, modal currents and modal radiation patterns. The paper is intended to study well known linear antennas under this new point of view.
{"title":"Theory of Characteristic Modes: Getting More Insight into Linear Antenna Behavior","authors":"P. Hazdra, P. Hamouz, M. Mazanek, S. Zvánovec","doi":"10.1109/RADIOELEK.2007.371672","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371672","url":null,"abstract":"The theory of characteristic modes is a very useful tool to get physical insight into antenna behavior. It is possible to easily obtain resonant frequencies, modal radiation Q or bandwidth, modal currents and modal radiation patterns. The paper is intended to study well known linear antennas under this new point of view.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"14 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":"133014080","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.2007.371477
T. Kratochvil, J. Prokopec
This paper deals with the characteristics of the DVB-H standard features and transmission of digital television to the DVB-H mobile terminals. The methodology of the mobile terminals testing is introduced including the specific transmission system in the laboratory of digital television and mobile communications DREL BUT. This can be used for efficient analysis in research and development of DVB-H broadcasting and its terminals.
{"title":"DVB-H Standard and Testing of its Mobile Terminals","authors":"T. Kratochvil, J. Prokopec","doi":"10.1109/RADIOELEK.2007.371477","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371477","url":null,"abstract":"This paper deals with the characteristics of the DVB-H standard features and transmission of digital television to the DVB-H mobile terminals. The methodology of the mobile terminals testing is introduced including the specific transmission system in the laboratory of digital television and mobile communications DREL BUT. This can be used for efficient analysis in research and development of DVB-H broadcasting and its terminals.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"1 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":"130416038","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.2007.371704
S. Thamm, S. Kochetov, G. Wollenberg, M. Leone
This paper deals with the modeling of arbitrary oriented interconnection structures with the method of partial elements regarding EMC simulations of power electronics. 1D and 2D PEEC models were developed, implemented and tested as well in the simulation tool Ansoft Simplorerreg as in SPICE. An alternative approach for the PEEC modeling is used to overcome the huge simulation effort in real conductor arrangements because of the high number of inductive and ca-pacitive couplings. The coupling matrices of this kind of PEEC models are diagonal dominant and matrix sparsification by truncation methods can be used without loss of passivity of the interconnections. The application of the developed PEEC models is shown for two examples.
{"title":"PEEC Modeling for EMC-relevant Simulations of Power Electronics","authors":"S. Thamm, S. Kochetov, G. Wollenberg, M. Leone","doi":"10.1109/RADIOELEK.2007.371704","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371704","url":null,"abstract":"This paper deals with the modeling of arbitrary oriented interconnection structures with the method of partial elements regarding EMC simulations of power electronics. 1D and 2D PEEC models were developed, implemented and tested as well in the simulation tool Ansoft Simplorerreg as in SPICE. An alternative approach for the PEEC modeling is used to overcome the huge simulation effort in real conductor arrangements because of the high number of inductive and ca-pacitive couplings. The coupling matrices of this kind of PEEC models are diagonal dominant and matrix sparsification by truncation methods can be used without loss of passivity of the interconnections. The application of the developed PEEC models is shown for two examples.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"21 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":"115016235","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.2007.371474
L. Copjan, J. Krahulec, S. Marchevsky, S. Benco
In this paper, we describe a problem of mitigating a multiple-access interference (MAI) and a channel disturbance in DS-CDMA technology. The receiver is based on a blind algorithm, which does not need any training sequence, or any information about the channel. Our simulations are oriented on a land mobile communications, where the channel is changing through the time. Proposed channel consists of three states. The comparison of effectiveness between the blind MOE algorithm and conventional detection using computer simulations is demonstrated and the experimental results of image transmission over 3-states channel using blind detection are presented.
{"title":"Image Transmission over the 3-states Channel Using MOE Blind Algorithm","authors":"L. Copjan, J. Krahulec, S. Marchevsky, S. Benco","doi":"10.1109/RADIOELEK.2007.371474","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371474","url":null,"abstract":"In this paper, we describe a problem of mitigating a multiple-access interference (MAI) and a channel disturbance in DS-CDMA technology. The receiver is based on a blind algorithm, which does not need any training sequence, or any information about the channel. Our simulations are oriented on a land mobile communications, where the channel is changing through the time. Proposed channel consists of three states. The comparison of effectiveness between the blind MOE algorithm and conventional detection using computer simulations is demonstrated and the experimental results of image transmission over 3-states channel using blind detection are presented.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"129 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":"115551420","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.2007.371673
M. Randus, K. Hoffmann
A medium-power two-stage transistor microwave amplifier for frequency band of 12 to 18 GHz using eight packaged HEMTs has been designed and developed. Gain over 16 dB, output power P-1 db > 22 dBm and return loss better than 10 dB both on the input and output has been achieved in the whole band. The input and output are DC grounded to protect the amplifier from electrostatic discharge (ESD). Mutually linked AWR microwave office circuit simulator, 3D EM field simulator CST microwave studio and precise small-signal s-parameters vector measurements were used for the design.
设计并研制了一种使用8个封装hemt的中功率两级晶体管微波放大器，用于12 ~ 18 GHz频段。在整个频段内，增益超过16 dB，输出功率P-1 dB > 22 dBm，输入和输出的回波损耗均优于10 dB。输入和输出是直流接地，以保护放大器免受静电放电(ESD)。采用相互链接的AWR微波办公电路模拟器、三维电磁场模拟器CST微波工作室和精确的小信号s参数矢量测量进行设计。
{"title":"Broadband Medium-Power Transistor Amplifier 12-18 GHz","authors":"M. Randus, K. Hoffmann","doi":"10.1109/RADIOELEK.2007.371673","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371673","url":null,"abstract":"A medium-power two-stage transistor microwave amplifier for frequency band of 12 to 18 GHz using eight packaged HEMTs has been designed and developed. Gain over 16 dB, output power P-1 db > 22 dBm and return loss better than 10 dB both on the input and output has been achieved in the whole band. The input and output are DC grounded to protect the amplifier from electrostatic discharge (ESD). Mutually linked AWR microwave office circuit simulator, 3D EM field simulator CST microwave studio and precise small-signal s-parameters vector measurements were used for the design.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"53 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":"124358007","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.2007.371492
F. Schadt, F. Mohr
This investigation was stimulated by the search for a simple and easy-to-apply method for measuring the movement of a car safety belt under a crash. Conventional methods would consist of gluing an incremental barcode-like strip on the belt, observing it with a reflective optical sensor, and counting the periods occurring while the belt is pulled out. However, as the woven structure of the belt constitutes a quite well-defined periodic texture by itself, the question arises if it is possible to determine the velocity from observing this. The method would then require imaging the texture to a suitably designed transmitting reference mask and evaluating the periodical signal observed behind the mask while the belt is moving. Mathematically, the proposed procedure can be called an optical spatial filter (OSF) technique. Of course, when applying OSF technique for velocity measurements of periodic objects it is vital to adapt the spatial filter closely to the moving object. While objects with a random surface or texture are quite easy to deal with, those with a periodic surface need special consideration. This investigation is aimed to explain the necessary considerations and to present techniques for suitably designing optical spatial filters.
{"title":"Spatial Filter Design Techniques with Applications in Optical Velocity Measurement","authors":"F. Schadt, F. Mohr","doi":"10.1109/RADIOELEK.2007.371492","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371492","url":null,"abstract":"This investigation was stimulated by the search for a simple and easy-to-apply method for measuring the movement of a car safety belt under a crash. Conventional methods would consist of gluing an incremental barcode-like strip on the belt, observing it with a reflective optical sensor, and counting the periods occurring while the belt is pulled out. However, as the woven structure of the belt constitutes a quite well-defined periodic texture by itself, the question arises if it is possible to determine the velocity from observing this. The method would then require imaging the texture to a suitably designed transmitting reference mask and evaluating the periodical signal observed behind the mask while the belt is moving. Mathematically, the proposed procedure can be called an optical spatial filter (OSF) technique. Of course, when applying OSF technique for velocity measurements of periodic objects it is vital to adapt the spatial filter closely to the moving object. While objects with a random surface or texture are quite easy to deal with, those with a periodic surface need special consideration. This investigation is aimed to explain the necessary considerations and to present techniques for suitably designing optical spatial filters.","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":"121315831","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.2007.371702
J. Svac̆ina, J. Dřinovský, R. Videnka
The paper deals with principles of so-called virtual anechoic room, which presents an economical and accessible possibility of ambient signal elimination in open field test site (OFTS) EMI measurement. Some variants of easy and efficient EM ambient cancellation are described and some measurement examples are presented in the article. In general, the radiated and conducted EM measurement based on principle of virtual anechoic room performs sufficiently accurate results without the need of dedicated and cost expensive OFTS or anechoic chamber.
{"title":"Virtual Anechoic Room An Useful Tool for EMI Pre-Compliance Testing","authors":"J. Svac̆ina, J. Dřinovský, R. Videnka","doi":"10.1109/RADIOELEK.2007.371702","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371702","url":null,"abstract":"The paper deals with principles of so-called virtual anechoic room, which presents an economical and accessible possibility of ambient signal elimination in open field test site (OFTS) EMI measurement. Some variants of easy and efficient EM ambient cancellation are described and some measurement examples are presented in the article. In general, the radiated and conducted EM measurement based on principle of virtual anechoic room performs sufficiently accurate results without the need of dedicated and cost expensive OFTS or anechoic chamber.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"11 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":"123721364","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.2007.371478
M. Kubícek
The paper describes a simulation model of a software and hardware recovery circuit. Performance of both models is compared and drawbacks of software recovery are discussed. To model different link conditions, signal source and data path models were created (to model jitter and noise of received signal). All simulations were performed in the Mentor Graphic's SystemVision 4.4 environment using VHDL-AMS models of signal source, data path and recovery circuits. The software recovery algorithm is written in synthesizable subset of VHDL and can be directly used as a part of an FPGA design.
{"title":"Simulation of Digital Clock and Data Recovery of Strongly Disturbed Signals","authors":"M. Kubícek","doi":"10.1109/RADIOELEK.2007.371478","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371478","url":null,"abstract":"The paper describes a simulation model of a software and hardware recovery circuit. Performance of both models is compared and drawbacks of software recovery are discussed. To model different link conditions, signal source and data path models were created (to model jitter and noise of received signal). All simulations were performed in the Mentor Graphic's SystemVision 4.4 environment using VHDL-AMS models of signal source, data path and recovery circuits. The software recovery algorithm is written in synthesizable subset of VHDL and can be directly used as a part of an FPGA design.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"20 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":"125191886","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.2007.371649
M. Sloboda, V. Rícný
The article briefly describes parameters of transmission channel and parameters of measuring the transmission and the sources of possible transmitting errors. In the first part, types of the transmission channels, the theoretic planning of the signal coverage and causes of simulating of ideal transmission channels are shown. The next part deals with the types of errors and the causes of errors in the transmission channel. This enumeration includes the computing of some error parameters. The last part of the article deals with a possible multi-path propagation of the digital television signal from transmitter to receiver. There is briefly explained a prevention of multipath reception by using a guard interval.
{"title":"Influence of Transmission Channel on DVB-T Signal","authors":"M. Sloboda, V. Rícný","doi":"10.1109/RADIOELEK.2007.371649","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371649","url":null,"abstract":"The article briefly describes parameters of transmission channel and parameters of measuring the transmission and the sources of possible transmitting errors. In the first part, types of the transmission channels, the theoretic planning of the signal coverage and causes of simulating of ideal transmission channels are shown. The next part deals with the types of errors and the causes of errors in the transmission channel. This enumeration includes the computing of some error parameters. The last part of the article deals with a possible multi-path propagation of the digital television signal from transmitter to receiver. There is briefly explained a prevention of multipath reception by using a guard interval.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"114 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":"125341608","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.2007.371425
L. Jozsa, J. Sebesta
This paper addresses design of a localization system using Doppler radar. First the hardware requirements are discussed. A lot of attention is paid to logarithmic amplifier issues as it plays a key role in the final design. Then the time-frequency analysis is presented as an option for signal processing.
{"title":"Doppler Radar System for Small Objects Localization","authors":"L. Jozsa, J. Sebesta","doi":"10.1109/RADIOELEK.2007.371425","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371425","url":null,"abstract":"This paper addresses design of a localization system using Doppler radar. First the hardware requirements are discussed. A lot of attention is paid to logarithmic amplifier issues as it plays a key role in the final design. Then the time-frequency analysis is presented as an option for signal processing.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"33 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":"116791585","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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