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2-Year Results of Hydrometeor Attenuation Research at 93 GHz on an 850 m Terrestrial Path 850 m地面路径93 GHz水流星衰减2年研究结果
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569932
V. Kvicera, M. Grábner, O. Fiser
{"title":"2-Year Results of Hydrometeor Attenuation Research at 93 GHz on an 850 m Terrestrial Path","authors":"V. Kvicera, M. Grábner, O. Fiser","doi":"10.1109/COMITE.2008.4569932","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569932","url":null,"abstract":"The results of 2 years of experimental research of attenuation due to hydrometeors at 94 GHz with V polarization on an 850 m path are presented. Both the cumulative distributions of attenuation due to all the hydrometeors together and the cumulative distributions of attenuation due to the individual hydrometeors are given. The influence of the individual hydrometeors on attenuation is assessed. The obtained cumulative distribution of rain attenuation for the 2-year period of observation is compared with the one calculated for the average year in accordance with relevant ITU-R recommendations.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116442583","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}
引用次数: 0
Evaluation and Correction of Cable Phase Stability in High Frequency Near-Field Measurement 高频近场测量中电缆相位稳定性的评价与校正
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569887
J. Vancl, P. Černý, Z. Škvor, M. Mazanek
{"title":"Evaluation and Correction of Cable Phase Stability in High Frequency Near-Field Measurement","authors":"J. Vancl, P. Černý, Z. Škvor, M. Mazanek","doi":"10.1109/COMITE.2008.4569887","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569887","url":null,"abstract":"In case of the near-field measurement, the radiated field by the measured antenna is received by two- dimensional scanner in defined points. During the process of the field scanning, the cable between the VNA and the scanner antenna is moved and its parameters are changed. This paper deals with the evaluation of the cable parameters changes. The dominant change is represented by the phase deviation of the cable transmission coefficient. The paper also proposes the method of the cable errors correction and evaluation of the correction method efficiency. The correction can be based on the full calibration at the reference plane of the scanner antenna feeding in all points of scanned field. The aforementioned approach is more time consuming than the proposed method, where the full calibration is performed in one selected point, while the correction of the cable parameters is based on the estimation based on the input impedance of the cable loaded by the scanner antenna.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122967685","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}
引用次数: 6
Waveguide Probes for Complex Permittivity Measurement 用于复杂介电常数测量的波导探头
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569903
R. Zajíček, T. Smejkal, L. Oppl, J. Vrba
{"title":"Waveguide Probes for Complex Permittivity Measurement","authors":"R. Zajíček, T. Smejkal, L. Oppl, J. Vrba","doi":"10.1109/COMITE.2008.4569903","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569903","url":null,"abstract":"Paper deals with the complex permittivity measurement of biological tissues. Application of a waveguide probe for this measurement is shown. A non-destructive and non-invasive method based on reflection coefficient measurement attaching the material under test is used. New types of the probes are under investigation - the section of waveguide with H cross-section, the section of waveguide with the rectangular cross-section and with shorted walls, the section of waveguide with inserted dielectric wedge and finally the section of waveguide filled by the liquid dielectric. Properties of these prototypes are studied in the frequency range from 300 kHz to 3 GHz. The method of finite difference in time domain is utilized for the numerical modeling and simulation of the reflection coefficient. The condition for the input reflection coefficient of the waveguide probe is the range from (0.7 - 0.3) in the broad frequency band. Although the waveguide is a narrowband microwave component, its modifications could have broadband frequency behavior of the reflection coefficient. Results indicate that the most interesting and suitable is the solution with removable dielectric. This liquid dielectric with the low value of permittivity has significant influence on the cut-off frequency of waveguide with dominant mode propagation.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116727235","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}
引用次数: 3
Parametric Equivalent Circuit of Single Layer Capacitor Mounted in Microstrip Line 微带线上单层电容的参数等效电路
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569950
J. Raboch, K. Hoffmann
{"title":"Parametric Equivalent Circuit of Single Layer Capacitor Mounted in Microstrip Line","authors":"J. Raboch, K. Hoffmann","doi":"10.1109/COMITE.2008.4569950","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569950","url":null,"abstract":"3-D EM simulator based equivalent circuit of a single layer capacitor (SLC) mounted on 50 Omega microstrip line of Arlon CuClad233 substrate was derived. The circuit corresponds to substrate thickness ranging from 0.254 mm to 1.270 mm and frequency range 45 MHz + 26 GHz. Values of equivalent circuit components determined by equations are dependent on substrate thickness.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125602893","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}
引用次数: 2
Applicator for In-vivo Experiments on Mice with Melanoma Tumour 黑素瘤小鼠体内实验应用器
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569908
P. Togni, J. Vrba, L. Vannucci
{"title":"Applicator for In-vivo Experiments on Mice with Melanoma Tumour","authors":"P. Togni, J. Vrba, L. Vannucci","doi":"10.1109/COMITE.2008.4569908","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569908","url":null,"abstract":"The use of electromagnetic fields in biomedicine for cancer treatment and diagnostics, nowadays begin to be quite widespread. This paper describes the design and the evaluation of a microwave applicator for treatment of small subcutaneous tumours implanted on animal model. The support of computer simulations was used to evaluate and optimise the fundamental parameters of the applicator and the SAR distribution in the biological tissue. The Results give the prospective to use this applicator for the study of the effects of hyperthermia treatment in relation with the characteristics of the treated tumour.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126713414","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}
引用次数: 0
Ultra Low Frequency Yeast Cells Electric Activity 超低频率酵母细胞电活动
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569910
M. Cifra, J. Pokorný, F. Jelínek, J. Hasek, Jan Simsa
{"title":"Ultra Low Frequency Yeast Cells Electric Activity","authors":"M. Cifra, J. Pokorný, F. Jelínek, J. Hasek, Jan Simsa","doi":"10.1109/COMITE.2008.4569910","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569910","url":null,"abstract":"This paper presents results from the measurement of the electrical activity cold sensitive beta-tubulin mutant tub2-401 of yeast cells in frequency region 0.4 - 1.6 kHz. 25 measurements of both synchronized and nonsynchronized cells show that the synchronized cells have higher electrical activity which corresponds to the findings of Pohl et al. Local nanomechanical vibrations of yeast cell membrane have been measured by Pelling et al. with Atomic Force Microscopy in same frequency region. Mechanical oscillations of electrically polar structures in cell may give rise to electric oscillations we measured.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123438228","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}
引用次数: 2
Analysis, Design and Measurement of Active Low-Noise Terminations 有源低噪声终端的分析、设计与测量
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569921
W. Ciccognani, F. Giannini, E. Limiti, P. Longhi
{"title":"Analysis, Design and Measurement of Active Low-Noise Terminations","authors":"W. Ciccognani, F. Giannini, E. Limiti, P. Longhi","doi":"10.1109/COMITE.2008.4569921","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569921","url":null,"abstract":"Active terminations are helpful when dealing with planar antenna arrays. In fact, some antenna elements may be used as dummy ones to prevent electromagnetic field asymmetries. Such antennas should be terminated on loads that are as low noise as possible so as not to disturb the neighbouring active antennas. By using the proposed methodology, an active 50 Omega, low noise termination with an equivalent noise temperature of about 100 K at room temperature has been designed in the full C-Band frequency range. Measurements on the fabricated MMIC are given demonstrating a good agreement between the predicted 80-100 K minimum equivalent noise temperature and the measured one.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122155329","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}
引用次数: 7
On the Indoor Propagation of UWB Signals 超宽带信号的室内传播研究
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569897
R. Urbán, S. Zvánovec
{"title":"On the Indoor Propagation of UWB Signals","authors":"R. Urbán, S. Zvánovec","doi":"10.1109/COMITE.2008.4569897","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569897","url":null,"abstract":"The large bandwidth of Ultra Wideband systems allows an achievement of extremely high data rates, and moreover utilization of high spectral capacity. The paper introduces the specific features of UWB signal propagation. Based on simulations and measurements the differences to classical narrowband systems are analyzed. Analyses are focused mainly on two-path propagation aspects, taking into account overlapping of a direct and a reflected UWB pulse. Based on such approach more complicated models and analyses of UWB system deployment in indoor environment can be accomplished.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123255249","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}
引用次数: 1
Partly Polarized Speckles and Speckle Reduction in Interferometry 干涉测量中的部分极化散斑和散斑消减
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569928
P. Kučera, F. Mohr
{"title":"Partly Polarized Speckles and Speckle Reduction in Interferometry","authors":"P. Kučera, F. Mohr","doi":"10.1109/COMITE.2008.4569928","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569928","url":null,"abstract":"In this paper we discuss problems in an interferometer which arise when the interferometer uses a conventional, so-called 'non-cooperative' target rather than a mirror. Under these conditions, the reflected light assumes the character of a speckle field which requires that we describe its statistical properties by applying first order statistics of Stokes parameters. Next we discuss how the interference signal is influenced by a speckle field with an arbitrary degree of polarization. Finally we show how the detrimental effects arising from the speckle field can be reduced when the target surface fluctuations are sufficiently (compared to the wavelength) small.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130509341","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}
引用次数: 2
Improvement of the Radiation Efficiency of the Metamaterial Zero-Order Resonator Antenna 超材料零阶谐振器天线辐射效率的提高
2008 14th Conference on Microwave Techniques Pub Date : 2008-04-23 DOI: 10.1109/COMITE.2008.4569935
D. Vrba, M. Polivka
{"title":"Improvement of the Radiation Efficiency of the Metamaterial Zero-Order Resonator Antenna","authors":"D. Vrba, M. Polivka","doi":"10.1109/COMITE.2008.4569935","DOIUrl":"https://doi.org/10.1109/COMITE.2008.4569935","url":null,"abstract":"In this paper a technique for improvement of radiation efficiency of metamaterial zero order antenna based on increasing of vertical antenna height is presented. Comparison of the two microstrip line implementation of the zero order resonator (ZOR) antennas with different height over ground plane is demonstrated. Improved ZOR antenna exhibit 75% efficiency compared to 10% of the reference antenna.","PeriodicalId":306289,"journal":{"name":"2008 14th Conference on Microwave Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120820502","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}
引用次数: 12
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