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.2007.371695
P. Piksa, P. Černý
A horn antenna with the gain equal to 20 dB at the frequency of 40 GHz has far-field in the distance of 0.4 m for the plane wave radiation and has a very wide beam-width. In case of adding and using of dielectric lens, the plane wave is created at the distance of 92 mm with the Gaussian amplitude distribution and focused into the very narrow beam. This energy focusing is used in the microwave, millimeter-wave and terahertz spectroscopies in order to reach the optimal coupling of energy into the measuring cuvette. This paper discusses the differences between focusing by a dielectric lens in the optical meaning with the ideal point source or Gaussian beam with respect to the real source represented by the horn antenna. The results of this paper consist of the location, where the focused beam is the narrowest, and the power distribution in this distance.
{"title":"Near-field Measurement of Gaussian Beam behind Dielectric Lens","authors":"P. Piksa, P. Černý","doi":"10.1109/RADIOELEK.2007.371695","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371695","url":null,"abstract":"A horn antenna with the gain equal to 20 dB at the frequency of 40 GHz has far-field in the distance of 0.4 m for the plane wave radiation and has a very wide beam-width. In case of adding and using of dielectric lens, the plane wave is created at the distance of 92 mm with the Gaussian amplitude distribution and focused into the very narrow beam. This energy focusing is used in the microwave, millimeter-wave and terahertz spectroscopies in order to reach the optimal coupling of energy into the measuring cuvette. This paper discusses the differences between focusing by a dielectric lens in the optical meaning with the ideal point source or Gaussian beam with respect to the real source represented by the horn antenna. The results of this paper consist of the location, where the focused beam is the narrowest, and the power distribution in this distance.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"67 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":"121543464","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.2007.371673
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.2007.371702
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.2007.371474
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.2007.371423
M. Drutarovský, P. Galajda
This paper presents a new chaos-based True Random Number Generator (TRNG) with decreased voltage supply sensitivity. Contrary to the traditionally used sources of randomness it uses well-defined deterministic switched-capacitor circuit that exhibits chaos. The whole design is embedded into commercially available mixed-signal PSoC reconfigurable device without any external components. Proposed design is optimized for reduction of influence of supply voltage to the quality of generated random bit stream. The influence of circuit non-idealities is significantly reduced by the proposed XOR corrector and optimized circuit topology. The ultimate output bit rate of proposed TRNG is 60 kbit/s and quality of generated bit-streams is confirmed by passing standard FIPS and correlation statistical tests performed in the full range of PSoC device supply voltages.
{"title":"A Robust Chaos-Based True Random Number Generator Embedded in Reconfigurable Switched-Capacitor Hardware","authors":"M. Drutarovský, P. Galajda","doi":"10.1109/RADIOELEK.2007.371423","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371423","url":null,"abstract":"This paper presents a new chaos-based True Random Number Generator (TRNG) with decreased voltage supply sensitivity. Contrary to the traditionally used sources of randomness it uses well-defined deterministic switched-capacitor circuit that exhibits chaos. The whole design is embedded into commercially available mixed-signal PSoC reconfigurable device without any external components. Proposed design is optimized for reduction of influence of supply voltage to the quality of generated random bit stream. The influence of circuit non-idealities is significantly reduced by the proposed XOR corrector and optimized circuit topology. The ultimate output bit rate of proposed TRNG is 60 kbit/s and quality of generated bit-streams is confirmed by passing standard FIPS and correlation statistical tests performed in the full range of PSoC device supply voltages.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"25 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":"121589580","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}
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}
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