NDLI: Edge diffraction and field transition along shadow boundaries using UTD

Content Provider	IEEE Xplore Digital Library
Author	Balanis, C.A.
Copyright Year	2008
Description	Author affiliation: Dept. of Electr. Eng., Arizona State Univ., Tempe, AZ (Balanis, C.A.)
Abstract	When electromagnetic fields strike sharp surface discontinuities, such as edges and corners, they create a diffraction phenomenon. In high-frequency methods, the field generated when a wave impinges upon a PEC wedge can be accounted by using geometrical optics (GO), based more on Snellpsilas law of reflection, and diffraction, based on Fermatpsilas principle for diffraction [1]. The diffraction phenomenon and its field contributions can be accounted for by utilizing diffraction coefficients for the appropriate discontinuities. One set of diffraction coefficients were derived by Keller [2], and they were dubbed as Kellerpsilas diffraction coefficients based on geometrical theory of diffraction (GTD). These diffraction coefficients exhibited singularities along the incident and reflection shadow boundaries (ISB and RSB), and limited their use. Another set of diffraction coefficients were derived by Kouyoumjian and Pathak [3], and they were dubbed as the K & P diffraction coefficients based on the uniform theory of diffraction (UTD). The UTD diffraction coefficients eliminated the singularities along the ISB and RSB and provided smooth transition from one side to the other side of the respective shadow boundaries. This was accomplished by introducing transition functions in the UTD formulation which removed the singularities and provided a more accurate representation of the field at and near the shadow boundaries. The UTD diffraction coefficients received international acclaim and expanded the application of diffraction theory to many otherwise intractable boundary-value problems, from simple geometries (such as strips and ground planes) to more complex (such as airframes, ships, and ground vehicles). Some of these applications will be illustrated in this presentation.
Starting Page	1
Ending Page	1
File Size	120214
Page Count	1
File Format	PDF
ISBN	9781424420414
DOI	10.1109/APS.2008.4619158
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-07-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Diffraction Optical diffraction Reflection Electromagnetics Electromagnetic fields Electrical engineering Marine vehicles
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

The contribution of Prof. Robert Kouyoumjian to edge diffraction and field transition at and near shadow boundaries using UTD

An improved UTD solution for wedge diffraction

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A brief history of the UTD-focus on edge diffraction

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Prediction of propagation characteristics using a rigorous UTD formula

Edge diffraction and field transition along shadow boundaries using UTD

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