SBMO International Microwave Conference/Brazil,最新文献_第6页

Application Of A Meteorological Model To Investigate The Effects Of Atmospheric Circulation On Microwave Line-Of-Sight Links 应用气象模式研究大气环流对微波视距链路的影响

SBMO International Microwave Conference/Brazil, Pub Date : 1993-08-02 DOI: 10.1109/SBMO.1993.587209

R. Silveira, O. Massambani, E. Costa

{"title":"Application Of A Meteorological Model To Investigate The Effects Of Atmospheric Circulation On Microwave Line-Of-Sight Links","authors":"R. Silveira, O. Massambani, E. Costa","doi":"10.1109/SBMO.1993.587209","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587209","url":null,"abstract":"surface. The greater part of such fadings are caused by alterations in the thermodynamic structure of the Planetary Boundary Layer (the This study presents an investigation of lake-land breeze atmospheric circulation responsible for strong horizontal and vertical inhomogeneities of lower portion of troposphere), caused by the moisture distribution affecting the refractivity influences of weather systems and also by local profile within a microwave propagation link as atmospheric circulations, resulting from diurnal observed during a Radiometeorological variation of horizontal pressure gradient, induced Exueriment camed out in Sa0 Paul0 Brazil. An Atmospheric Boundary Layer Mesoscale model (RAMS) was used to simulate the local circulation within the link region and to compute the time evolution of the vertiical structure of the refractivity index. A Ray Tracing model WSLS also used in order to simulate the intensity of the received signals under those circumstances. The integrated results were compared to measured received signals on the imicrowave link. It was observed a good agreement between the simulated characteristics of the temperature and moisture advection and the observed microwave propagation phenomena in the link. by surface inhomogeneities. Sea-Land breeze, River and Lake-Land breeze are examples of such circulations. With the purpose to investigate the impact of meteorological phenomena on microwave communication systems, a data set from a radio-meteorological experiment performed in Sao Paul0 Brazil region was used to perform a diagnostic of propagation conditions on microwave line-of-sight links located near to a river and a water reservoir.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127463821","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

Millimetre And Submillimetre Wave Heterodyne Receivers For Atmospheric Sounding And Radioastronomy 大气探测和射电天文学用毫米波和亚毫米波外差接收机

SBMO International Microwave Conference/Brazil, Pub Date : 1993-08-02 DOI: 10.1109/SBMO.1993.589549

G. Beaudin, A. Deschamps, P. Encrenaz, P. Feautrier, P. Febvre, M. Gheudin, O. Perrin, J. Pernot, C. Prigent, C. Robert, G. Ruffle

引用次数: 1

Performance Of Co-channel Dual Polarized Systems With Modern Antenna Design. Influence Of Antenna-XPD And XPIC-improvement Factor 采用现代天线设计的同信道双极化系统性能。天线xpd和xpic改进因子的影响

SBMO International Microwave Conference/Brazil, Pub Date : 1993-08-02 DOI: 10.1109/SBMO.1993.589409

M. Glauner, M. Biester

引用次数: 2

Low Birefringence Single Mode Optical Fiber: Polarimetric Properties 低双折射单模光纤:偏振特性

SBMO International Microwave Conference/Brazil, Pub Date : 1993-08-02 DOI: 10.1109/SBMO.1993.589366

A. Vieira, M.T. Camargo Silva

引用次数: 0

NEC's MMIC And MIC Activities For Microwave Telecommunications NEC的微波通信MMIC和MIC活动

SBMO International Microwave Conference/Brazil, Pub Date : 1993-08-02 DOI: 10.1109/SBMO.1993.587228

M. Mineo, T. Kaneko, T. Saryo, J. Mizoe, M. Okamoto, S. Shinozaki

{"title":"NEC's MMIC And MIC Activities For Microwave Telecommunications","authors":"M. Mineo, T. Kaneko, T. Saryo, J. Mizoe, M. Okamoto, S. Shinozaki","doi":"10.1109/SBMO.1993.587228","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587228","url":null,"abstract":"A brief review of recent MMlC and MIC activities for telecommunications by NEC Corp. will be given: voltage controlled oscillators, power amplifiers, prescalers and a modulator are specific to this application. These MMICs and MICs are commercially available equipment, riot in the stage of research . INTRODUCTION MMICs and MICs play an important role in microwave and millimeter-wave telecommunication equipment because of advantages like high reliability and small size. Their characteristic of low cost is particularly important when they are used in big quantities like for very small aperture terminal (VSAT) satellite communication systems, personal communication network (PCN) systems, mobile telephone systems etc. In this paper we will describe some kinds of MMICs and MICs that are used in our microwave and millimeter-wave telecommunication equipment. v c o s Fig.1 shows a schematic diagr'am of the LO OSC that is used in NEC's VSA.T out door units (ODU). The VCO is stabilized by an analog phase-locked loop using a voltage controlled crystal osciriator (VCXO) and the VCXO is stabilized by a digital phase-locked loop using an oven controlled crystal oscillator (OCXO). In this subsystem the VCO and the sampling phase detector (SPD) are MIC modules. We have developed a 15.8GHz, +12dBm feedback-type VCO stabilized by a dielectric resonator for this application[']. A schematic diagram of the VCO is shown in Fig 3. NEC's 0 . 5 ~ m-gate-leingth GaAs MESFET, NEC's GaAs variictor diode and a dielectric resonator are constructed on a dielectric substrate (11.6\" X 7.6\" X O.635mm, E ,=9.8). Fig.4 and fig.5 show the: measured modulation sensitivity and temperature dependence respectively. We realized approximately 1.8h4HzJV modulation a 0.2dBpp output ]power level fluctuation an 1 .gpipm/\"C frequency stability with a 0.4dBpp /-4Q°C---+80c output power level fli uation. Similar characteristics are achieved in a reflection-type /CO whose schematic agmn is shown in fig.6.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132015028","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

Commercial Computer-Aided Design Software Optimises DRO Circuit Design 商用计算机辅助设计软件优化DRO电路设计

SBMO International Microwave Conference/Brazil, Pub Date : 1993-08-02 DOI: 10.1109/SBMO.1993.587199

B. Virdee, A. Parsons, R. G. Meadows

引用次数: 2

Stabilized Millimeter Oscillators Employing Planar And Quasi-optic Image Whispering Gallery Mode Disc Dielectric Resonators 采用平面和准光学图像低语通道模式光盘介质谐振器的稳定毫米波振荡器

SBMO International Microwave Conference/Brazil, Pub Date : 1993-08-02 DOI: 10.1109/SBMO.1993.589553

Li Ying, Li Xin, Li Hong

引用次数: 0

Broadband Spread Spectrum Multiple Access For Personal And Cellular Communications 宽带扩频多址个人和蜂窝通信

SBMO International Microwave Conference/Brazil, Pub Date : 1993-08-02 DOI: 10.1109/SBMO.1993.589354

D. Schilling

引用次数: 3

Hermetically Packaged Semiconductor Optical Amplifier For Application In Singlemode Fiber Systems 应用于单模光纤系统的密封封装半导体光放大器

SBMO International Microwave Conference/Brazil, Pub Date : 1993-08-02 DOI: 10.1109/SBMO.1993.589385

F. R. Barbosa, C. Coral, J. R. Caumo, A. Flacker

引用次数: 3

Analysis Of A Dielectric Channel Waveguide Diffused In An Anisotropic Substrate With A Gaussian-Gaussian Index Of Refraction Profile Using The Finite-Difference Method 高斯-高斯折射率各向异性衬底介质波导扩散的有限差分分析

SBMO International Microwave Conference/Brazil, Pub Date : 1993-08-02 DOI: 10.1109/SBMO.1993.587213

C.L. da Silva Souza Sobrino, A.J. Giarola

引用次数: 3