Journal ArticleDOI
Time domain version of the uniform GTD
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The uniform geometrical theory of diffraction (UTD) solutions can be inversely transformed analytically to obtain a time-domain version of the UTD as discussed by the authors.Abstract:
The uniform geometrical theory of diffraction (UTD) solutions can be inversely transformed analytically to obtain a time-domain version of the UTD. The time-domain solutions are valid in the early time period where an observation time t is close to the time after the arrival of the first diffracted wavefront. Comparisons with GTD (geometrical theory of diffraction) and also with available rigorous results (J.B. Keller and A. Blank, 1951) reveal that the UTD solutions are accurate for substantial early time periods while the GTD (Keller and Blank) results are valid for very early time periods. >read more
Citations
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Journal ArticleDOI
Time-domain uniform geometrical theory of diffraction for a curved wedge
TL;DR: In this paper, a time-domain version of the uniform geometrical theory of diffraction (TD-UTD) is developed to describe the transient electromagnetic scattering from a perfectly conducting, arbitrarily curved wedge excited by a general time impulsive astigmatic wavefront.
Journal ArticleDOI
Modeling the ultra-wideband outdoor channel: Measurements and parameter extraction method
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Journal ArticleDOI
A generalized time domain multipath channel and its application in ultra-wideband (UWB) wireless optimal receiver design-Part II: physics-based system analysis
TL;DR: A new generalized time-domain multipath channel based on the geometric theory of diffraction/uniform theory of diffusion (GTD/UTD) framework is incorporated into the system bit-error rate and signal-to-noise ratio by modifying the existing system model.
Journal ArticleDOI
Physics-based pulse distortion for ultra-wideband signals
TL;DR: A physics-based deterministic model for urban environments consisting of high rise buildings that captures many properties that are not available in the existing statistical models such as the IEEE 802.15.4a model is proposed.
Journal ArticleDOI
Time-domain modeling in electromagnetics
TL;DR: In this article, the authors discuss general time-domain modeling in electromagnetics, considering why time domain modeling may be worth doing and some choices to be made among the principle modeling approaches.
References
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Journal ArticleDOI
A uniform geometrical theory of diffraction for an edge in a perfectly conducting surface
R.G. Kouyoumjian,P.H. Pathak +1 more
TL;DR: In this article, a compact dyadic diffraction coefficient for electromagnetic waves obliquely incident on a curved edse formed by perfectly conducting curved plane surfaces is obtained, which is based on Keller's method of the canonical problem, which in this case is the perfectly conducting wedge illuminated by cylindrical, conical, and spherical waves.
Journal ArticleDOI
Diffraction and reflection of pulses by wedges and corners
Joseph B. Keller,Albert A. Blank +1 more
Journal ArticleDOI
Diffraction of the Pulsed Field from an Arbitrarily Oriented Electric or Magnetic Dipole by a Perfectly Conducting Wedge
TL;DR: In this paper, an image procedure in an infinitely extended angular space is used to construct closed form solutions for the fields radiated by an arbitrarily oriented pulsed electric or magnetic dipole in the presence of a perfectly conducting wedge.
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