Download or read book Absorption and Transmission of Electromagnetic Waves written by E. MEYER and published by . This book was released on 1957 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Absorption and Transmission of Electromagnetic Waves Phase K Multi layer Absorber written by H. W. HELBERG and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book absorption and Transmission of Electromagnetic Waves Phase M Part A Combination of Magnetic Layer and Wedge Type Absorbers written by R. POTTEL and published by . This book was released on 1962 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Absorption and Transmission of Electromagnetic Waves Phase J Investigation of Interdependence of Absorber Design Parameters broadband Magnetic Layer Absorbers with Small Thickness written by H. W. HELBERG and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two ferrite materals, Ferramic E and Ferramic E 1960, were used as magnetc layer absorbers. The measured reflection coefficients were below 10% in the frequency anges 4.2 x 10 to the 7th to 3.8 x 10 to the 8th and 2.4 x 10 to the 8th to 7.6 x 10 to the 8th, respectively. The thicknesses of layer were 0.88 cm and 0.5 cm respectively. These measurements confirmed the reflection coefficients calculated from the relaive dielectric constant and relative permeability. Various materials were tested with respect to their applicability as absorber material. (Author).
Download or read book Applications of Electromagnetic Waves written by Reza K. Amineh and published by MDPI. This book was released on 2021-01-20 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electromagnetic (EM) waves carry energy through propagation in space. This radiation associates with entangled electric and magnetic fields which must exist simultaneously. Although all EM waves travel at the speed of light in vacuum, they cover a wide range of frequencies called the EM spectrum. The various portions of the EM spectrum are referred to by various names based on their different attributes in the emission, transmission, and absorption of the corresponding waves and also based on their different practical applications. There are no certain boundaries separating these various portions, and the ranges tend to overlap. Overall, the EM spectrum, from the lowest to the highest frequency (longest to shortest wavelength) contains the following waves: radio frequency (RF), microwaves, millimeter waves, terahertz, infrared, visible light, ultraviolet, X-rays, and gamma rays. This Special Issue consists of sixteen papers covering a broad range of topics related to the applications of EM waves, from the design of filters and antennas for wireless communications to biomedical imaging and sensing and beyond.
Download or read book Absorption and Transmission of Electromagnetic Waves Phase M Part B combination of Magnetic Layer and Graphite Foil Absorbers written by H. W. HELBERG and published by . This book was released on 1962 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: The electromagnetic properties of a ferrite layer placed in front of a metal plate are investigated. For this purpose the reflection coefficient is measured as a function of the frequency with the thickness of the sample as parameter. The measurements are carrie out in a coaxial line with Ferramic E 1960 as test substance. In order to increase the bandwidth at larger t ickness of layer the ferrite is electrically shunted with a resistivity foil and the reflection coefficient of this combination is again measured as a function of the frequency. Parameters are the thickness of the ferrite layer and the surface resistivity of the foil. With this combination the operating frequency range is extended towards lower frequencies. Without resistivity foil the reflection coefficient remains about 10% in the entire range. (Author).
Download or read book Absorption and Transmission of Electromagnetic Waves Phase H Dipole resonance absorber for Wide Angles of Incidence written by E. G. NEUMANN and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reduction of the reflection coefficient of dipole absorbers for oblique incidence of electromagnetic waves was investigated. To complete the theory of reflection by the additional system of dipoles, the propagation of electromagnetic waves in an artificial absorbing medium consisting of infinitely long parallel wires with small conductivity was studied. Measurements were made with centimeter waves using a parallel-platetransmission line to determine the equivalent propagation constants of the medium by scanning the electric field with respect to amplitude and phase. The propagation properties of the parallel wire medium are explained with a theory deduced from an analogy to line-theory. (Author).
Download or read book Absorption and Transmission of Electromagnetic Waves Phase L Resonance Absorbers with Absorbing Structures in Or Behind a Metal Plate written by S. LUHMANN and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: A number of resonance absorbers for electromagnetic waves are described, which serve for the reflectionless coating of a metal wall. The absorbers are characterized by the fact that the absorbing structure is placed behind the metal wall to be protected. Coupling of the incident wave to the absorbing structure is made through small openings in the metal plate. Rectangular, triangular and circular ring slots were used as coupling holes. With a wedge absorber behind the metal plate the reflection coefficient r was below 0.1 within a frequency interval with a relative bandwidth of about 10%. Absorbing strip-line components were developed in order to achieve a thin absorbing structure and to compensate the frequency dependence of the impedance of the coupling holes. With these components an operating range r
Download or read book Electromagnetic Wave Absorbers written by Youji Kotsuka and published by John Wiley & Sons. This book was released on 2019-09-18 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Addresses the importance of EM wave absorbers and details pertinent theory, design, and applications Demands for various EM-wave absorbers are rapidly increasing along with recent trends toward complicated electromagnetic environments and development of higher-frequency communication equipment, including AI technology. This book provides a broad perspective on electromagnetic wave absorbers, as well as discussion of specific types of absorbers, their advantages and disadvantages, their applications, and performance verification. Electromagnetic Wave Absorbers: Detailed Theories and Applications presents the theory behind wave absorbers and their practical usage in design of EM-wave absorber necessary particularly for EMC environments, and similar applications. The first half of the book contains the foundations of electromagnetic wave engineering, specifically the transmission line theories necessary for EM-wave absorber analysis, the basic knowledge of reflection, transmission, and absorption of electromagnetic waves, derivation of Maxwell's equations and computer analysis. The second half describes special mediums, absorber application examples, simplified methods of absorber design, autonomously controllable EM-wave absorber, and more. This valuable text: Provides detailed explanations of basic theory and applied theory for understanding EM-wave absorbers Discusses the material constant measurement methods of EM-wave absorption characteristics that are necessary for designing EM-wave absorbers Includes examples of novel EM-wave absorber configurations Electromagnetic Wave Absorbers: Detailed Theories and Applications is an ideal read for researchers and students concerned with electromagnetic wave engineering. It will also appeal to computer software engineers and electromagnetic field theory researchers.
Download or read book Absorption and Transmission of Electromagnetic Waves Phase C Absorption of Electromagnetic Cm waves in Anisotropic Media written by Reinhard Pottel and published by . This book was released on 1957 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: With ferrite materials available up to date, equalness of permeability and dielectric constant cannot be achieved for frequencies above 1000 Mc/s without application of static magnetic fields. The reason is given by the large spreading of the natural resonant frequencies of different crystallites or domains. This spreading can be reduced but cannot be completely avoided in principle. Using static magnetic fields, equalness of permeability and dielectric constant in ferrites can be achieved up to frequencies of about 5000 Mc/s. The relative width of the frequency band within which the reflection coefficient is below 0.1 then is about 15%. A widening of this range is necessarily coupled with a reduction of the limiting frequency. For equal permeability and dielectric constant the attenuation along one vacuum wave length at 5000 Mc/s is about 500 dB. Because of the difficulties arising in homogeneously magnetizing larger plates of ferrite material, the discussed method cannot be used for large absorber arrangements. (Author).
Download or read book Waves written by Mike Goldsmith and published by Oxford University Press, USA. This book was released on 2018 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: From sound waves to gravitational waves, and from waves of light to crashing rollers on the ocean, Mike Goldsmith explores the fundamental features shared by all waves in the natural world, and considers the range of phenomena resulting from wave motion, including reflection, diffraction, and polarization in light, and beats and echoes in sound.
Download or read book Applications of Electromagnetic Waves written by Reza K. Amineh and published by . This book was released on 2020 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electromagnetic (EM) waves carry energy through propagation in space. This radiation associates with entangled electric and magnetic fields which must exist simultaneously. Although all EM waves travel at the speed of light in vacuum, they cover a wide range of frequencies called the EM spectrum. The various portions of the EM spectrum are referred to by various names based on their different attributes in the emission, transmission, and absorption of the corresponding waves and also based on their different practical applications. There are no certain boundaries separating these various portions, and the ranges tend to overlap. Overall, the EM spectrum, from the lowest to the highest frequency (longest to shortest wavelength) contains the following waves: radio frequency (RF), microwaves, millimeter waves, terahertz, infrared, visible light, ultraviolet, X-rays, and gamma rays. This Special Issue consists of sixteen papers covering a broad range of topics related to the applications of EM waves, from the design of filters and antennas for wireless communications to biomedical imaging and sensing and beyond.
Download or read book Transmission and Absorption of Electromagnetic Waves in a Collisionless Plasma Slab written by Ryo Sugihara and published by . This book was released on 1966 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation is made of the propagation of electromagnetic waves normal to a plasma slab having a density grandient. The plane of polarization of waves is perpendicular to an external magnetic field. At resonances, a WKB-type approximation does not represent waves and an appreciable absorption appears due to infinitesimal collisions: so called the resonance absorption. The transmission and absorption coefficients are obtained in the limit of no collisions when in the slab the cut off is adjacent to the resonance. (Author).
Download or read book Applications of Electromagnetic Waves written by Reza K. Amineh and published by MDPI. This book was released on 2021-01-20 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electromagnetic (EM) waves carry energy through propagation in space. This radiation associates with entangled electric and magnetic fields which must exist simultaneously. Although all EM waves travel at the speed of light in vacuum, they cover a wide range of frequencies called the EM spectrum. The various portions of the EM spectrum are referred to by various names based on their different attributes in the emission, transmission, and absorption of the corresponding waves and also based on their different practical applications. There are no certain boundaries separating these various portions, and the ranges tend to overlap. Overall, the EM spectrum, from the lowest to the highest frequency (longest to shortest wavelength) contains the following waves: radio frequency (RF), microwaves, millimeter waves, terahertz, infrared, visible light, ultraviolet, X-rays, and gamma rays. This Special Issue consists of sixteen papers covering a broad range of topics related to the applications of EM waves, from the design of filters and antennas for wireless communications to biomedical imaging and sensing and beyond.
Download or read book Absorption and Transmission of Electromagnetic Waves Phase A Cm wave Absorption in Aqueous Solutions of Electrolytes written by R. Pottel and published by . This book was released on 1959 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: From attenuation and phase measurements at the frequencies 4, 8 and 25.3 kmc/s the complex relative dielectric constant epsilon of aqueous BeSO4- and Al2(SO4)3-solutions has been determined for the temperature 25C in dependence on concentration up to 6 gram equival./1. The obtained epsilon-values approximately comply to Cole-Cole-Diagrams which for increasing electrolyte concentration show reduction of the static dielectric constant, shift of the water relaxational absorption range towards lower frequencies and its broadening. The question is treated, in as far thin layers of water and aqueous electrolytic solutions on a metal plate can be made reflectionless absorbing for normal incident waves. (Author).
Download or read book Absorption and Transmission of Electromagnetic Waves Phase Iii Inhomogeneous Foil Absorbers with Dielectric and Magnetic Losses written by H. W. Helberg and published by . This book was released on 1966 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental method of realising an inhomogeneous transmission line for electromagnetic waves by sets of foils arranged one upon the other is described. There are two or three basic types of foils; one is lossless while the other contains lossy material. Inhomogeneous transmission line sections are obtained by constructing a set of foils of lossless and lossy foils alternately. The number of lossy foils can be varied from one set to the other in accordance with a given function. The measurements are made in a rectangular waveguide at some 4 GHz. (Author).
Download or read book Tour of the Electromagnetic Spectrum written by Ginger Butcher and published by Government Printing Office. This book was released on 2016 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
