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Author:
Publisher: Ed. Techniques Ingénieur
ISBN:
Category :
Languages : fr
Pages : 10
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Book Description
Author:
Publisher: Ed. Techniques Ingénieur
ISBN:
Category :
Languages : fr
Pages : 10
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Book Description
Author: Kenneth Davies
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 490
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Book Description
Author: Peder Oluf Pedersen
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 284
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Book Description
Author: Curt Levis
Publisher: John Wiley & Sons
ISBN: 0470542950
Category : Technology & Engineering
Languages : en
Pages : 316
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Book Description
An accessible student-oriented approach to radiowave propagation Propagation-the process whereby a signal is conveyed between transmitter and receiver-has a profound influence on communication systems design. Radiowave Propagation provides an overview of the physical mechanisms that govern electromagnetic wave propagation in the Earth's troposphere and ionosphere. Developed in conjunction with a graduate-level wave propagation course at The Ohio State University, this text offers a balance of physical and empirical models to provide basic physical insight as well as practical methods for system design. Beginning with discussions of propagation media properties, plane waves, and antenna and system concepts, successive chapters consider the most important wave propagation mechanisms for frequencies ranging from LF up to the millimeter wave range, including: Direct line-of-sight propagation through the atmosphere Rain attenuation The basic theory of reflection and refraction at material interfaces and in the Earth's atmosphere Reflection, refraction, and diffraction analysis in microwave link design for a specified terrain profile Empirical path loss models for point-to-point ground links Statistical fading models Standard techniques for prediction of ground wave propagation Ionospheric propagation, with emphasis on the skywave mechanism at MF and HF and on ionospheric perturbations for Earth-space links at VHF and higher frequencies A survey of other propagation mechanisms, including tropospheric scatter, meteor scatter, and propagation effects on GPS systems Radiowave Propagation incorporates fundamental materials to help senior undergraduate and graduate engineering students review and strengthen electromagnetic physics skills as well as the most current empirical methods recommended by the International Telecommunication Union. This book can also serve as a valuable teaching and reference text for engineers working with wireless communication, radar, or remote sensing systems.
Author: Castanet
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Léon Bouthillon
Publisher:
ISBN:
Category : Radio
Languages : fr
Pages : 364
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Book Description
Author: Walter A. Flood
Publisher:
ISBN:
Category : Radio meteorology
Languages : en
Pages : 190
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Book Description
The results of rf breakdown measurements at 106 Mcs in a large waveguide are reported. Breakdown measurements for air, oxygen and nitrogen were made as a function of pressure (10-1000 microns), pulse length and pulse repetition frequency. The data indicate that when diffusion losses are minimized, a value of 30 volts per com-mmHg is obtained for the breakdown threshold over a pressure range from 200 - 1000 microns. The principle that ion cyclotron resonance in weakly ionized gases can be detected, and that the collision cross-section pertinent to the reaction can be determined from the resonance line width is proved. The effect of known processes of electron production and loss upon the steady-state electron concentration and upon atmospheric breakdown is discussed. Breakdown is described as a sudden increase in electron concentration occurring at a specific field, upon negligible increase of field from this value. (Author).
Author: Institute for Telecommunication Sciences
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 40
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Book Description
The expansion of telecommunication services into the millimeter wave region prompts a careful look at the limitations of the atmosphere that can give rise to severe signal degradations. In Part I the loss and scatter mechanisms in the 10- to 40- GHz range are examined. It is concluded that there is a need for further theoretical and experimental work on the atmospheric propagation properties in order to support the engineering efforts in designing reliable, useful systems. In Part II the discussions are extended to the 40- to 75 -GHz region where absorption by oxygen dominates. In this region, communication through the atmosphere is not practical; however, the oxygen absorption has a great potential for remote sensing of atmospheric variables, and for special (short-range communication) applications. Unsolved problems of the propagation medium are discussed as a basis for formulating proposals; and the objectives of an experimental program for studying oxygen dispersion and absorption are given.
Author: Hervé Sizun
Publisher: Springer Science & Business Media
ISBN: 3540266682
Category : Technology & Engineering
Languages : en
Pages : 423
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Book Description
This book describes the physical mechanisms involved in the propagation of electromagnetic waves in the radiofrequency range, inside and outside buildings, in the terrestrial and near space environments, with a special focus on mobile radio communication. It combines a theoretical and an experimental approaches with an understanding of the physical environment through adequate formulations of the laws of electromagnetism. It should thus provide the background needed by advanced students and development engineers for the conception of high quality and reliable telecommunication systems.
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 926
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Book Description
