Pub Date : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936459
L. Sorokosz, W. Zieniutycz, M. Pergol
Results of numerical simulations of a compact ultra wideband planar microstrip-to-coplanar strips balun is described in this paper. This circuit has been designed on the basis of configuration referenced in the literature. However, for application in the UWB antenna feeding networks it has been redesigned for the appropriate substrate. The designed balun has been loaded with a planar circular dipole, in order to validate its usefulness. Results obtained from full-wave simulations are presented in the paper. Calculated parameters of the balun and antenna show satisfactory level and predestine the circuit for fabrication.
{"title":"Compact planar balun for the UWB dipole feeding network","authors":"L. Sorokosz, W. Zieniutycz, M. Pergol","doi":"10.1109/RADIOELEK.2011.5936459","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936459","url":null,"abstract":"Results of numerical simulations of a compact ultra wideband planar microstrip-to-coplanar strips balun is described in this paper. This circuit has been designed on the basis of configuration referenced in the literature. However, for application in the UWB antenna feeding networks it has been redesigned for the appropriate substrate. The designed balun has been loaded with a planar circular dipole, in order to validate its usefulness. Results obtained from full-wave simulations are presented in the paper. Calculated parameters of the balun and antenna show satisfactory level and predestine the circuit for fabrication.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114937891","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936431
N. Ortega-Quijano, F. Fanjul-Vélez, I. Salas-García, J. L. Arce-Diego
The application of optical techniques in medical diagnosis provides relevant advantages in terms of resolution, contrast, or the possibility of performing functional imaging. During the measurement processes that are involved in the design and verification of biomedical optical models, techniques and prototypes, it is convenient to make use of materials that mimic the optical properties shown by biological tissues. These media are called tissue phantoms. The choice of materials for obtaining such tissue phantoms is crucial. Therefore, it is necessary to analyze the properties of biological tissues and of the available materials, and to perform a comparative study between them. Once the appropriate materials are chosen, the experimental determination of their optical characteristics must be performed in a precise way before they are used in the measurements. In this work, the optical properties of lipid-based tissue phantoms are analyzed and measured, with the final aim to use them for the experimental simulation of biological tissues.
{"title":"Optical characterization of lipid-based tissue phantoms","authors":"N. Ortega-Quijano, F. Fanjul-Vélez, I. Salas-García, J. L. Arce-Diego","doi":"10.1109/RADIOELEK.2011.5936431","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936431","url":null,"abstract":"The application of optical techniques in medical diagnosis provides relevant advantages in terms of resolution, contrast, or the possibility of performing functional imaging. During the measurement processes that are involved in the design and verification of biomedical optical models, techniques and prototypes, it is convenient to make use of materials that mimic the optical properties shown by biological tissues. These media are called tissue phantoms. The choice of materials for obtaining such tissue phantoms is crucial. Therefore, it is necessary to analyze the properties of biological tissues and of the available materials, and to perform a comparative study between them. Once the appropriate materials are chosen, the experimental determination of their optical characteristics must be performed in a precise way before they are used in the measurements. In this work, the optical properties of lipid-based tissue phantoms are analyzed and measured, with the final aim to use them for the experimental simulation of biological tissues.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126869451","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936461
V. Ru̇žek, J. Dřinovský, Z. Kejík, Jiří Zachar
The Workbench Faraday Cage measurement method is a well known way, how to measure disturbance caused by integrated circuits mounted on PCB. This paper deals with simulation of this method provided by FORTRAN FDTD code. This work explores the influence of harmfull signals to measurement probe position and proposes a main theses, how to connect measure probes properly. Effect of opened Faraday Cage is also simulated.
{"title":"Influence of the probe position to disturbance measurement in the Workbench Faraday Cage","authors":"V. Ru̇žek, J. Dřinovský, Z. Kejík, Jiří Zachar","doi":"10.1109/RADIOELEK.2011.5936461","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936461","url":null,"abstract":"The Workbench Faraday Cage measurement method is a well known way, how to measure disturbance caused by integrated circuits mounted on PCB. This paper deals with simulation of this method provided by FORTRAN FDTD code. This work explores the influence of harmfull signals to measurement probe position and proposes a main theses, how to connect measure probes properly. Effect of opened Faraday Cage is also simulated.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122243078","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936394
J. Petrzela, T. Gotthans, Z. Hrubos
This paper presents a novel analog oscillator reported recently by the first two authors. It came from the mathematical description of the so-called labyrinth chaos but it is much more suitable for fully analog circuitry implementation. The necessity of realization of the three independent channels performing goniometrical transfer functions is replaced by its rough approximation, namely the periodical sign functions. The brief mathematical background is completed by a number of the laboratory experiments. Finally some future perspectives, possible modifications and practical usability are discussed.
{"title":"Analog implementation of gotthans-petrzela oscillator with virtual equilibria","authors":"J. Petrzela, T. Gotthans, Z. Hrubos","doi":"10.1109/RADIOELEK.2011.5936394","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936394","url":null,"abstract":"This paper presents a novel analog oscillator reported recently by the first two authors. It came from the mathematical description of the so-called labyrinth chaos but it is much more suitable for fully analog circuitry implementation. The necessity of realization of the three independent channels performing goniometrical transfer functions is replaced by its rough approximation, namely the periodical sign functions. The brief mathematical background is completed by a number of the laboratory experiments. Finally some future perspectives, possible modifications and practical usability are discussed.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122330988","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936393
Markus Holzer, Frank Schumacher, Ivan Flores, Thomas Greiner, W. Rosenstiel
In this work we present a real time video processing framework, which can handle high data throughput rates. Contrary to common digital hardware realizations which use several image line long shift register pipelines for direct calculation of 2D neighborhood operations, we suggest an efficient cyclic image line storage structure by using dual port block RAM buffers, which are available in recent FPGAs. Therefore, our approach does not occupy a huge amount of valuable logic resources in the FPGA for shift registers based data storage and achieves a high data throughput by parallel video data processing paths. With this memory structure we realize — already principally proposed in a previous work — a new hardware architecture of the basic morphological image processing operations erosion and dilation as building blocks. With these building blocks, which are hardware occupation and maximum clock frequency efficient, we also implemented the combined morphological operations opening and closing, which are commonly used for image enhancement like noise reduction and object contour smoothing.
{"title":"A real time video processing framework for hardware realization of neighborhood operations with FPGAs","authors":"Markus Holzer, Frank Schumacher, Ivan Flores, Thomas Greiner, W. Rosenstiel","doi":"10.1109/RADIOELEK.2011.5936393","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936393","url":null,"abstract":"In this work we present a real time video processing framework, which can handle high data throughput rates. Contrary to common digital hardware realizations which use several image line long shift register pipelines for direct calculation of 2D neighborhood operations, we suggest an efficient cyclic image line storage structure by using dual port block RAM buffers, which are available in recent FPGAs. Therefore, our approach does not occupy a huge amount of valuable logic resources in the FPGA for shift registers based data storage and achieves a high data throughput by parallel video data processing paths. With this memory structure we realize — already principally proposed in a previous work — a new hardware architecture of the basic morphological image processing operations erosion and dilation as building blocks. With these building blocks, which are hardware occupation and maximum clock frequency efficient, we also implemented the combined morphological operations opening and closing, which are commonly used for image enhancement like noise reduction and object contour smoothing.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124990536","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936406
Peter Lukac, R. Hudec, M. Benco, P. Kamencay, Z. Dubcová, M. Zachariasova
In the image analysis, image segmentation is the operation that divides image into set of different segments. The paper deals about common color image segmentation techniques and methods. The advantages and disadvantage of each one will be described in this paper. At the end of the paper, the evaluation criterion will be introduced and applied on the algorithms results. Five most used image segmentation algorithms, namely, Efficient graph based, K-means, Mean shift, Expectation maximization and hybrid method are compared by designed criterion.
{"title":"Simple comparison of image segmentation algorithms based on evaluation criterion","authors":"Peter Lukac, R. Hudec, M. Benco, P. Kamencay, Z. Dubcová, M. Zachariasova","doi":"10.1109/RADIOELEK.2011.5936406","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936406","url":null,"abstract":"In the image analysis, image segmentation is the operation that divides image into set of different segments. The paper deals about common color image segmentation techniques and methods. The advantages and disadvantage of each one will be described in this paper. At the end of the paper, the evaluation criterion will be introduced and applied on the algorithms results. Five most used image segmentation algorithms, namely, Efficient graph based, K-means, Mean shift, Expectation maximization and hybrid method are compared by designed criterion.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130234909","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936460
P. Martínek, M. Valenta, D. Ticha
This paper discusses some aspects of design and realization of the simple second-order low-pass building blocks (LP-SFB), suitable for less demanding anti-aliasing and reconstruction filters. The main attention is devoted to the ”single active device” solutions, based on CC-II type current conveyor or transconductance amplifier (OTA). As the template, the Rauch's multiple-feedback circuit was used. Presented SFBs show very low ω0 and Q sensitivities and, in contrast to the known Sallen-Key circuits, save good stop-band attenuation. Proposed design uses DE algorithm and allows almost independent tunning of ω0 and Q parameters.
{"title":"A contribution to the 2nd-order LP filters design","authors":"P. Martínek, M. Valenta, D. Ticha","doi":"10.1109/RADIOELEK.2011.5936460","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936460","url":null,"abstract":"This paper discusses some aspects of design and realization of the simple second-order low-pass building blocks (LP-SFB), suitable for less demanding anti-aliasing and reconstruction filters. The main attention is devoted to the ”single active device” solutions, based on CC-II type current conveyor or transconductance amplifier (OTA). As the template, the Rauch's multiple-feedback circuit was used. Presented SFBs show very low ω0 and Q sensitivities and, in contrast to the known Sallen-Key circuits, save good stop-band attenuation. Proposed design uses DE algorithm and allows almost independent tunning of ω0 and Q parameters.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130380783","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936453
Filip Krajcovic, V. Bilik
The paper investigates possibilities and limitations of polynomial approximation of scattering parameters of a high-power 2.45-GHz coaxial impedance transformer tuning element. The approximation is a basis for a simple and compact mathematical model of the three-stub coaxial tuner, intended for the use in automatic impedance matching devices. The input data are frequency responses of S11 and S21 for various settings of the sliding short. The approximation is a two-dimensional polynomial (in dependence on short position and frequency) of suitably modified S-parameters. Approximation with satisfactory accuracy can be achieved.
{"title":"S-parameters approximation of coaxial impedance transformer tuning element","authors":"Filip Krajcovic, V. Bilik","doi":"10.1109/RADIOELEK.2011.5936453","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936453","url":null,"abstract":"The paper investigates possibilities and limitations of polynomial approximation of scattering parameters of a high-power 2.45-GHz coaxial impedance transformer tuning element. The approximation is a basis for a simple and compact mathematical model of the three-stub coaxial tuner, intended for the use in automatic impedance matching devices. The input data are frequency responses of S11 and S21 for various settings of the sliding short. The approximation is a two-dimensional polynomial (in dependence on short position and frequency) of suitably modified S-parameters. Approximation with satisfactory accuracy can be achieved.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122655688","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936448
M. Příhoda, O. Morávek, K. Hoffmann
A novel method for improving properties of absorber materials usable on a microstrip transmission line is proposed. Improvement is obtained by using a metallic sheets and changing a distribution of electric field along the absorber. Suitability of these absorbers as sliding load elements is discussed as well. Experimental verification of proposed modification has been done and comparison of measured data to the simulated results is discussed.
{"title":"Study of absorber materials usable on microstrip and their attribute improvements","authors":"M. Příhoda, O. Morávek, K. Hoffmann","doi":"10.1109/RADIOELEK.2011.5936448","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936448","url":null,"abstract":"A novel method for improving properties of absorber materials usable on a microstrip transmission line is proposed. Improvement is obtained by using a metallic sheets and changing a distribution of electric field along the absorber. Suitability of these absorbers as sliding load elements is discussed as well. Experimental verification of proposed modification has been done and comparison of measured data to the simulated results is discussed.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124149247","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936434
A. Noga
The Physical Optics (PO) approximation is investigated as tool for analysis of scattering problems involving coated electrically large conducting platforms. The PO-derived current is corrected by including additional terms that account for diffraction phenomena. Numerical example demonstrates usefulness and limitations of the approach and compares results for conducting and coated plate.
{"title":"Physical optics approximation for PEC objects coated with lossy material","authors":"A. Noga","doi":"10.1109/RADIOELEK.2011.5936434","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936434","url":null,"abstract":"The Physical Optics (PO) approximation is investigated as tool for analysis of scattering problems involving coated electrically large conducting platforms. The PO-derived current is corrected by including additional terms that account for diffraction phenomena. Numerical example demonstrates usefulness and limitations of the approach and compares results for conducting and coated plate.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124226460","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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