Diffraction

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a screen by diffraction from a square aperture]] Diffraction refers to various phenomena which occur when a wave encounters an obstacle. Italian scientist Francesco Maria Grimaldi coined the word "diffraction" and was the first to record accurate observations of the phenomenon in 1665. (Wikipedia.org)






Conferences related to Diffraction

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2016 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting

This is the annual symposium for the IEEE Antennas and Propagation Society, and it is joint with the US National Committee of URSI's Radio Science Meeting.


2013 13th Mediterranean Microwave Symposium (MMS)

2013 MMS will include distinguished keynote speakers, parallel oral presentations and poster sessions. Topics cover state-of-the art as well as current progress and recent developments in several emerging topics related to RF, microwave engineering and applications.

  • 2011 Mediterranean Microwave Symposium (MMS)

    MMS 2011 will provide an international forum for reporting progress and recent developments in RF and microwave and in many other related topics theory and applications . MMS'2011 will consist of technical and invited sessions and keynote and tutorial sessions covering the state-of-the art of several hot topics in RF and microwave engineering and technology.

  • 2010 10th Mediterranean Microwave Symposium (MMS)

    MMS2010 will provide an international forum for reporting progress and recent developments in RF and microwave theory and applications. Suggested topics are listed below, but consideration will be given to papers on other subjects.

  • 2009 Mediterranean Microwave Symposium (MMS)

    MMS 2005 will provide an international forum for reporting progress and recent developments in RF and microwave theory and applications. Suggested topics are listed below, but consideration will be given to papers on other subjects. Suggested Topics : 1. Propagation, Scattering and diffraction 2. Microwave and Millimeter-Wave Circuits. 3. Photonics, non linear optics and devices 4. Microwaves and millimeterwave devices CAD 5. RF and Wireless Technology and Applications 6. Interconnects 7. W


2013 XVIIIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)

Theoretical aspects of electrodynamicsWaveguide and photonic crystal structuresScattering and diffractionInverse problems and synthesisPropagation in complex mediaAntennas and antenna arraysNumerical methods in electrodynamicsAcoustics: theory and applications


Days on Diffraction 2013 (DD)

Mathematical aspects of wave propagation, Asymptotic techniques, Scattering and diffraction, Electromagnetics, Sound propagation and vibration, Elastic waves and seismology, Nonlinear waves, Microwave and quantum waveguides, Inverse problems, Numerical approaches, Non-stationary phenomena


2010 URSI International Symposium on Electromagnetic Theory (EMTS 2010)

all aspects of electromagnetic theory and its applications



Periodicals related to Diffraction

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Antennas and Propagation, IEEE Transactions on

Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.


Antennas and Wireless Propagation Letters, IEEE

IEEE Antennas and Wireless Propagation Letters (AWP Letters) will be devoted to the rapid electronic publication of short manuscripts in the technical areas of Antennas and Wireless Propagation.


Applied Superconductivity, IEEE Transactions on

Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission


Biomedical Engineering, IEEE Transactions on

Broad coverage of concepts and methods of the physical and engineering sciences applied in biology and medicine, ranging from formalized mathematical theory through experimental science and technological development to practical clinical applications.


Device and Materials Reliability, IEEE Transactions on

Provides leading edge information that is critical to the creation of reliable electronic devices and materials, and a focus for interdisciplinary communication in the state of the art of reliability of electronic devices, and the materials used in their manufacture. It focuses on the reliability of electronic, optical, and magnetic devices, and microsystems; the materials and processes used in the ...


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Most published Xplore authors for Diffraction

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Xplore Articles related to Diffraction

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Optimized Conformal FDTD (2, 4) Method for Calculating Reflected and Diffracted Electromagnetic Fields of Perfectly Conducting Wedges

[{u'author_order': 1, u'affiliation': u'Center for Optical and Electromagnetic Research, Zhejiang Provincial Key Lab for Sensing Technologies, Zhejiang University , Hangzhou, China', u'full_name': u'Xiang Yuan'}, {u'author_order': 2, u'affiliation': u'Center for Optical and Electromagnetic Research, Zhejiang Provincial Key Lab for Sensing Technologies, State Key Lab of MOI, Zhejiang University, Hangzhou, China', u'full_name': u'Wen-Yan Yin'}, {u'author_order': 3, u'affiliation': u'Center for Optical and Electromagnetic Research, Zhejiang Provincial Key Lab for Sensing Technologies, Zhejiang University , Hangzhou, China', u'full_name': u'Xiang-Hua Wang'}, {u'author_order': 4, u'affiliation': u'Center for Optical and Electromagnetic Research, Zhejiang Provincial Key Lab for Sensing Technologies, Zhejiang University , Hangzhou, China', u'full_name': u'Jun Hu'}, {u'author_order': 5, u'affiliation': u'Center for Optical and Electromagnetic Research, Zhejiang Provincial Key Lab for Sensing Technologies, Zhejiang University , Hangzhou, China', u'full_name': u'Jing Jin'}] IEEE Transactions on Electromagnetic Compatibility, 2014

An optimized conformal finite-difference time-domain (FDTD) (2, 4) method is proposed for calculating reflected, diffracted, and total fields of two- and three-dimensional (2- and 3-D) perfectly conducting (PEC) wedges with an electromagnetic pulse (EMP) incidence, where one low-cost coefficient- modification (CM) technique is implemented for effectively reducing its numerical dispersion error. For the 2-D geometries, both reflected and diffracted fields ...


Radiation of a charge passing from vacuum into the left-handed medium

[{u'author_order': 1, u'affiliation': u'Radiophysics Department, Saint Petersburg State University, Russia', u'full_name': u'S. N. Galyamin'}, {u'author_order': 2, u'affiliation': u'Radiophysics Department, Saint Petersburg State University, Russia', u'full_name': u'T. Yu. Alekhina'}, {u'author_order': 3, u'affiliation': u'Radiophysics Department, Saint Petersburg State University, Russia', u'full_name': u'A. V. Tyukhtin'}, {u'author_order': 4, u'affiliation': u'Radiophysics Department, Saint Petersburg State University, Russia', u'full_name': u"E. G. Doil'nitsina"}] Proceedings of the International Conference Days on Diffraction 2009, None

We analyse the problem with a charge intersecting the interface between ordinary medium and "left-handed" one. Both the case of semi-infinite media and the case of a cylindrical waveguide are considered. We describe exact and asymptotic approaches for investigation of the electromagnetic field. We note features of spatial radiation due to unusual properties of "left-handed" medium. In particular, the effect ...


On applicability of the extended boundary condition method with the spheroidal basis

[{u'author_order': 1, u'affiliation': u'St.Petersburg University of Aerocosmic Instrumentations, Russia', u'full_name': u'Victor G. Farafonov'}, {u'author_order': 2, u'affiliation': u'Pulkovo Observatory RAS, Russia', u'full_name': u"Vladimir B. Il'in"}, {u'author_order': 3, u'affiliation': u'St.Petersburg University of Aerocosmic Instrumentations, Russia', u'full_name': u'Alexander A. Vinokurov'}, {u'author_order': 4, u'affiliation': u'St.Petersburg University of Aerocosmic Instrumentations, Russia', u'full_name': u'Elena V. Leksachenko'}] Proceedings of the International Conference Days on Diffraction 2009, None

The problem of light scattering by small particles is commonly solved today by the extended boundary condition method (EBCM) that uses expansions of the fields in terms of wave functions. The method is known to have a limited range of applicability. We analytically study the method in the case when spheroidal functions are applied. We find the conditions under which ...


Direct deposition of textured ZnO:Al TCO films by rf sputtering method for thin film solar cells

[{u'author_order': 1, u'affiliation': u'New & Renewable Energy Dept., Korea Inst. of Energy Res., Taejon, South Korea', u'full_name': u'J. C. Lee'}, {u'author_order': 2, u'affiliation': u'New & Renewable Energy Dept., Korea Inst. of Energy Res., Taejon, South Korea', u'full_name': u'K. H. Kang'}, {u'author_order': 3, u'affiliation': u'New & Renewable Energy Dept., Korea Inst. of Energy Res., Taejon, South Korea', u'full_name': u'S. K. Kim'}, {u'author_order': 4, u'affiliation': u'New & Renewable Energy Dept., Korea Inst. of Energy Res., Taejon, South Korea', u'full_name': u'I. J. Park'}, {u'author_order': 5, u'affiliation': u'New & Renewable Energy Dept., Korea Inst. of Energy Res., Taejon, South Korea', u'full_name': u'J. Song'}, {u'author_order': 6, u'affiliation': u'New & Renewable Energy Dept., Korea Inst. of Energy Res., Taejon, South Korea', u'full_name': u'K. H. Yoon'}] Conference Record of the Twenty-Ninth IEEE Photovoltaic Specialists Conference, 2002., None

Textured thin films ZnO has been successfully grown by rf magnetron sputtering method using a special technique of introducing a small amount of water and methanol on the deposition chamber. The surface morphology of the films has pyramidal structure and the degree of texture is dependent on the Ar ambient pressure. The pressure in this experiment varied from 50 mTorr ...


Formation of TbFe amorphous thin films by high dose implantation of Tb ions and their magnetic properties

[{u'author_order': 1, u'affiliation': u'Yokohama National University, Yokohama, Japan', u'full_name': u'Y. Gondo'}, {u'author_order': 2, u'full_name': u'Y. Suezawa'}, {u'author_order': 3, u'full_name': u'R. Tsuchiya'}] IEEE Transactions on Magnetics, 1984

The decrease was observed in the magnetic moment in unit area of the Fe films implanted with high dose Tb ions. This decrease was shown to be due to the formation of the Tb-Fe alloy layer sandwitched by Fe layers. This multilayer structure was similar to that reported previously in the Dy-Ni films implanted with high dose Dy ions. The ...


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Educational Resources on Diffraction

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IEEE-USA E-Books

  • High Frequency Asymptotics: The 2D Wedge Diffraction Problem

    In this chapter, high frequency asymptotics (HFA) techniques are reviewed through a classical, canonical problem: EM wave scattering from a wedge shaped object with perfectly electrical conductor (PEC) boundaries. A MATLAB-based virtual diffraction tool WedgeGUI, using analytical exact as well as well- known HFA techniques, is also introduced. Mathematical equations of different models are included for both line source (LS) and plane wave (PW) illuminations. The PW models presented are exact by series summation, PO, PTD, UTD, and PE models.

  • Physical Optics Solutions of Canonical Problems

    This chapter shows how to apply the physical optics (PO) method to study electromagnetic scattering from electrically large bodies of simple shapes. It applies this method to infinite cones with variously shaped cross sections and derive approximations for the tip‐diffracted wave. The chapter shows that the PO solution for scattering from opaque plates can always be reduced to a line integral, and if the plate has the form of a polygon the PO integral simplifies even further to a sum of contributions from the tips of the polygon. It focuses on PO solutions for bodies of revolution, and also shows that the transformation to a one‐dimensional integral is possible for the incidence along the symmetry axis of the body. The axial backscattering from smoothly shaped pointed scatterers, like an ogive, is particularly weak, with the main contribution coming from the tip; a broad variety of tip diffraction coefficients.

  • Numerical and Experimental Examples

    This chapter provides some numerical examples of measure of propagation velocity based on the diffraction curves. The real ground penetrating radar (GPR) pulses cannot have zero duration, because the band of the system (in particular the band of the antennas) is never infinite. In the real word, the diffraction curves have some ?>thickness,?> and this constitutes an unavoidable source of uncertainty, both with regard to the propagation velocity of the waves and with regard to the depth of the buried targets. The chapter describes some examples about the needed spatial step, frequency step and the correlated achievable horizontal and vertical resolutions. It shows some examples regarding the effect of the height of the observation domain and background removal. The chapter demonstrates application of 2D and 3D migration algorithms to field data.

  • Geometric Theory of Diffraction and Low‐frequency Techniques

    This chapter examines the high‐frequency technique, which is applicable to objects much greater than a wavelength, and the low‐frequency technique, which is applicable to object sizes much smaller than a wavelength. For object size close to a wavelength, called the resonance region, the method of moment and other numerical techniques can be used effectively. Extensive literature is available for the geometric theory of diffraction (GTD) and its related subjects. As the wavelength X approaches zero, the field can be described by geometric optics, but it contains no diffraction effect. The chapter considers the two‐dimensional problem of finding the field diffracted by a slit of width 2a on a conducting plane and Dirichlet's problem. According to Fermat's principle, the diffracted rays should be along the optical length. The diffraction coefficients for the curved wedge are the same as those for the straight wedge since it is not affected by the radius of curvature.

  • Propagation

    None

  • Multipath Fading Phenomena in Terrestrial Wireless Communication Links

    This chapter first compares the results of theoretical predictions of the loss characteristics in the space domain, with experiments carried out in various land environments. It focuses our attention on estimating the accuracy of the statistical description of the built‐up terrain on radio signal spatial attenuation and its frequency dependence. The chapter then presents a theoretical and experimental analysis of slow and fast fading based on the unified algorithm estimating these phenomena in various communication links, taking into consideration both the classical methods and the unified stochastic multiparametric model. Next, it briefly describes the role of Rician K‐factor in multipath phenomena differentiation both in space, angle of arrival (i.e., azimuth), and time of arrival (i.e., time delay) domains. Finally, the chapter deals with radio coverage and radio map constructions accounting for terrain features and overlay profile effects of the buildings, that is, the 3‐D configuration of built‐up terrains.

  • Ray‐Tracing Modeling

    This chapter contains sections titled: Introduction Main Physical Phenomena Involved in Propagation Incorporating the Influence of Vegetation Ray‐Tracing Methods References

  • Indoor Radio Propagation

    The WLAN user needs to understand the relationship between indoor propagation effects and how WLAN performance is affected. This chapter presents the importance of accounting for the signal distribution not only in path loss‐distance domain, but also in joint time‐of‐arrival (TOA) and angle‐of‐arrival (AOA) domains for positioning and service of each subscriber located in indoor environment of service. The propagated electromagnetic signal can undergo three primary physical mechanisms: reflection, diffraction, and scattering. Multipath phenomena of multiple reflection, diffraction, and scattering give rise to additional radio propagation paths beyond the direct line‐of‐sight (LOS) path between the radio transmitter and receiver. The chapter outlines models for path loss within buildings: numerical ray‐tracing unified theory of diffraction (UTD) model; physical waveguide model of radio propagation inside a building corridor; physical model of radio propagation between floors and walls; and empirical models. Finally, it discusses the budget link design of indoor communication links.

  • Diffraction Tomography

    There are several kinds of diffraction tomography (DT) relationships in relationship with the measurement configuration, but this chapter focuses on the common offset configuration. In general, a DT relationship requires more approximations than does the linearization provided by the BA. The effective maximum view angle is difficult to be predicted in a theoretical way, but in general it can be heuristically evaluated from the data. The chapter demonstrates the calculation of the available horizontal resolution, although the horizontal resolution cannot be separated from the vertical one, because the two quantities are correlated within the DT relationships. DT also provides an approximated but powerful tool to calculate the spatial step needed for taking GPR measurements correctly. The chapter also shows that GPR data can be processed either in the frequency domain or in the time domain.

  • Channel Modeling

    This chapter contains sections titled: Introduction Large‐Scale Propagation Models Small‐Scale Propagation Models and Statistical Multipath Channel Models Summary



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