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Parameters measurement of power amplifier using vector network analyzer 基于矢量网络分析仪的功率放大器参数测量
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545065
P. Černý
{"title":"Parameters measurement of power amplifier using vector network analyzer","authors":"P. Černý","doi":"10.1109/COMITE.2013.6545065","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545065","url":null,"abstract":"This paper presents the setup for power amplifier measurement using the vector network analyzer that accompanies the internal directional coupler. In addition, the procedures of s-parameter and power calibrations are introduced. The obtained results are presented and discussed.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126878060","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
CPW-fed double triangular slot antenna for biomedical applications 生物医学用cpw馈电双三角槽天线
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545041
V. Hebelka, Z. Raida
{"title":"CPW-fed double triangular slot antenna for biomedical applications","authors":"V. Hebelka, Z. Raida","doi":"10.1109/COMITE.2013.6545041","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545041","url":null,"abstract":"In the paper, the design of a coplanar waveguide (CPW) fed double triangular ring slot antenna is studied. The antenna was designed for a wireless body centric communication between a health monitor device and a sensor. The communication link is designed to operate in the ISM frequency band 5.725 GHz to 5.875 GHz (ITU-R 5.138, 5.150 and 5.280). The presented study shows properties of the antenna in various distances from human body models. Attention is turned to impedance matching and radiation pattern of the antenna. The antenna was designed considering a single-layer technology and the Arlon 25N substrate. The prototype of the antenna was fed by a 50 Ω coaxial cable.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"215 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134304641","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
Modeling of the multichannel optical wireless link 多通道无线光链路的建模
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545047
M. Pavlu, J. Poliak
{"title":"Modeling of the multichannel optical wireless link","authors":"M. Pavlu, J. Poliak","doi":"10.1109/COMITE.2013.6545047","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545047","url":null,"abstract":"This paper deals with multi-channel wireless links with a higher range designated for free-space optical (FSO) communications in an atmospheric media. Propagation of the optical beam in the atmosphere is analyzed and a novel approach of the photonic transmitter was proposed and analyzed. The simulation is carried out for the dual optical link. The link budget was analyzed for both wavelengths in the atmospheric windows - 850 nm and 1550 nm. Optical intensity distribution of the transmitted beam was also examined. At the end, measurements and simulations were carried out to verify the accuracy of the simulation of individual components used in the wireless link.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125253728","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: 4
Influence of random fluctuations of laser beam propagation direction on FSO power design 激光束传播方向随机波动对FSO功率设计的影响
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545050
B. Bonev
{"title":"Influence of random fluctuations of laser beam propagation direction on FSO power design","authors":"B. Bonev","doi":"10.1109/COMITE.2013.6545050","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545050","url":null,"abstract":"An algorithm for power design of ground-to-ground Free-Space Laser Communication Systems (Free-Space Optics (FSO)) is suggested. The random fluctuations of laser beam propagation direction, caused by mechanical vibrations of transmitter's antenna and atmospheric turbulence, and also atmospheric extinction are taken into consideration. The algorithm allows calculation of laser source power and receiver's antenna radius and transparency when the Bit-Error-Rate (BER) and the parameters that describe communication channel status are given. The analysis shows the FSO power design problem has no solution for desired BER when the mechanical vibrations and/or the atmospheric turbulence are strong enough. Influence of the initial radius of laser beam and random fluctuations of laser beam propagation direction on possible solutions of FSO power design problem are also studied. Suggested algorithm is used to analyze atmospheric turbulence and mechanical vibrations effect on the FSO power design for different communication channel lengths.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121878429","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: 4
Directivity coupler with a very low coupling coefficient 指向性耦合器具有非常低的耦合系数
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545051
T. Shejbal
{"title":"Directivity coupler with a very low coupling coefficient","authors":"T. Shejbal","doi":"10.1109/COMITE.2013.6545051","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545051","url":null,"abstract":"The paper describes a double - dielectric layer S band high directivity coupler with a very low coupling (-40 dB and -60 dB) designed on microstrip transmission line technology. The four coupler ports are used as: one input, two outputs and one isolated port terminated by 50 Ω SMD resistor. The directivity coupler consists of two substrates with a common ground plane and with microstrips situated on the opposite sides of the individual substrates. The coupling is provided by two circular slots in the common ground plane. The couplers were designed and simulated in the CST Microwave Studio. Finally experimental samples were fabricated and measured. In the paper the simulation and measured results of the couplers are presented and discussed.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114726268","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
Attenuation of optical signal in free space - Event analysis 自由空间中光信号的衰减。事件分析
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545063
V. Brazda, O. Fiser, L. Rejfek, M. Mandlik
{"title":"Attenuation of optical signal in free space - Event analysis","authors":"V. Brazda, O. Fiser, L. Rejfek, M. Mandlik","doi":"10.1109/COMITE.2013.6545063","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545063","url":null,"abstract":"Institute of Atmospheric Physics ASCR operates a dual-wavelength free space optical (FSO) link at meteorological observatory Milesovka (837 m.a.s.l.). Relevant meteorological quantities which attenuate the signal are also measured. To understand the physics behind also individual attenuation events are to be analyzed. This contribution focuses on interesting events with fog, rain and other meteorological phenomena which cause a high attenuation or an outage. Comparisons with theoretical models are also discussed. Widely known models describe signal behavior in individual situations, when only one type of meteorological phenomenon occurs. This paper shows an effect of different attenuation phenomena combinations.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132097195","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
Realistic simulation of IEEE 802.11p channel in mobile Vehicle to Vehicle communication 移动车对车通信中IEEE 802.11p信道的真实仿真
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545061
Tarikul Islam, Yongchang Hu, Dr. Ertan Onur, Bert Boltjes, Dr. J. F. C. M de Jongh
{"title":"Realistic simulation of IEEE 802.11p channel in mobile Vehicle to Vehicle communication","authors":"Tarikul Islam, Yongchang Hu, Dr. Ertan Onur, Bert Boltjes, Dr. J. F. C. M de Jongh","doi":"10.1109/COMITE.2013.6545061","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545061","url":null,"abstract":"Intelligent Transportation Systems (ITS) is becoming an important paradigm, because of its ability to enhance safety and to mitigate congestion on road traffic scenarios. Realizing the fact that data collection scheme from in-situ test beds for large number of vehicles is always expensive and time consuming, before being employed in large scale, such safety critical system should be tested narrowing down the gap between real circumstances and analytical models in a simulation platform. It is evident that underlying radio wave propagation models can comprise the validity of large scale vehicular network simulation results. Vehicle-to-Vehicle (V2V) channels have higher dynamics due to rapidly varying topologies and environments which have significant impact on performance study of upper layer protocols and applications. In spite of the fact that few measurement based empirical channel models are present in the literature, they are not tested for large scale vehicular networks. In this study, we simulate suburban scenarios with hundreds of IEEE802.11p nodes in the OPNET simulation environment with more realistic channel models. The standard OPNET propagation model was replaced by Nakagami-m fading channel. For the sake of modeling, changing relative velocity attribute and separation distance, power spectrum and fading parameter-m were defined as function of velocity and separation distance respectively. Then statistics were collected to evaluate performance of physical and higher layers. Primarily we have found all the vehicles within the standard requirement for Dedicated Short Range Communications (DSRC) range of 1 kilometer may not receive packets, which was also found in several earlier publications.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133210334","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: 23
Transistor oscillator 24.7 GHz stabilized by HEM221 mode of rectangular dielectric resonator 矩形介电谐振器HEM221模式稳定晶体管振荡器24.7 GHz
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545043
M. Haase, K. Hoffmann
{"title":"Transistor oscillator 24.7 GHz stabilized by HEM221 mode of rectangular dielectric resonator","authors":"M. Haase, K. Hoffmann","doi":"10.1109/COMITE.2013.6545043","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545043","url":null,"abstract":"A transistor oscillator 24.7 GHz with rectangular dielectric resonator (DR) working in HEM221 mode in feedback path between drain and gate was developed in the microstrip structure. Lower mode oscillations were suppressed by properly designed layout of the circuit. 4.5 dBm output power and 100 dBc/Hz phase noise at 100 kHz from the carrier was achieved with transistor VMMK-1225.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125283051","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
Error analysis of phase retrieval method combining global and local approaches 全局与局部相结合的相位检索方法误差分析
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545056
T. Mikulášek, J. Puskely
{"title":"Error analysis of phase retrieval method combining global and local approaches","authors":"T. Mikulášek, J. Puskely","doi":"10.1109/COMITE.2013.6545056","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545056","url":null,"abstract":"This paper deals with an error analysis of the phase retrieval algorithm combining the minimization method based on global optimization and the iterative method representing the local approach. The method exploits amplitude measurements on two planes placed in different distances from the measured antenna. In the paper, robustness of the algorithm is investigated and according to this some recommendations regarding the method and measurement are discussed.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122217158","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
Radar PRF staggering and agility control maximizing overall blind speed 雷达PRF惊人和敏捷控制最大化整体盲速
2013 Conference on Microwave Techniques (COMITE) Pub Date : 2013-04-17 DOI: 10.1109/COMITE.2013.6545070
P. Sedivy
{"title":"Radar PRF staggering and agility control maximizing overall blind speed","authors":"P. Sedivy","doi":"10.1109/COMITE.2013.6545070","DOIUrl":"https://doi.org/10.1109/COMITE.2013.6545070","url":null,"abstract":"This paper reviews impact of Pulse Repetition Frequency (PRF) and carrier frequency selection sequence on the pulsed Doppler low PRF (land based) radar system overall blind speed. Paper includes analysis of system parameters impact on overall blind speed upper bound caused by PRI staggering ratio, operation frequency bandwidth and Moving Target Detection filter bank. Paper includes design rules maximizing overall blind speed with respect to other system design constrains and procedure of transmitted signal bursts parameter selection achieving overall blind speed upper bound.","PeriodicalId":372048,"journal":{"name":"2013 Conference on Microwave Techniques (COMITE)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131664215","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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