A UTD Triple Diffraction Coefficient for Straight Wedges in Arbitrary Configuration

Carluccio, Giorgio; Puggelli, Federico; Albani, Matteo

doi:10.1109/tap.2012.2209623

Cited by 16 publications

(13 citation statements)

References 22 publications

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“…Finally, we excluded the survey of fundamental theory (GO and UTD) in this paper. References [45]- [49] give more information on GO and UTD, and [50]- [54] give more information on slope diffraction and multi-diffraction.…”

Section: Resultsmentioning

confidence: 99%

A Survey of Efficient Ray-Tracing Techniques for Mobile Radio Propagation Analysis

Imai

2017

IEICE Trans. Commun.

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Tetsuro IMAI †a) , Member SUMMARY With the advances in computer processing that have yielded an enormous increase in performance, numerical analytical approaches based on electromagnetic theory have recently been applied to mobile radio propagation analysis. One such approach is the ray-tracing method based on geometrical optics and the uniform geometrical theory of diffraction. In this paper, ray-tracing techniques that have been proposed in order to improve computational accuracy and speed are surveyed. First, imaging and ray-launching methods are described and their extended methods are surveyed as novel fundamental ray-tracing techniques. Next, various ray-tracing acceleration techniques are surveyed and categorized into three approaches, i.e., deterministic, heuristic, and brute force. Then, hybrid methods are surveyed such as those employing Physical optics, the Effective Roughness model, and the Finite-Difference Time-Domain method that have been proposed in order to improve analysis accuracy.

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Section: Resultsmentioning

confidence: 99%

A Survey of Efficient Ray-Tracing Techniques for Mobile Radio Propagation Analysis

Imai

2017

IEICE Trans. Commun.

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“…Differently from the buildings vertical corners, horizontal edges are not necessarily parallel to each other, and this poses a theoretical limit to the computation of the multiplediffracted field using a 3D ray tracing approach. In fact, although the geometrical trajectories can be tracked regardless of the number of involved diffractions [19], analytical expressions for the corresponding propagating field are available only for up to 3 if the wedges are arbitrarily oriented [20]. Since ORT propagation may sometimes require more than 3 diffractions, especially for large link distance, for rays undergoing more than 2 diffractions the fully 3D geometrical computation is replaced with a simplified approach using a multiple-screen UTD model limited to the vertical plane, considering one/two knife-edges for each building along the radial line between the Tx and the receiver (Rx).…”

Section: Extensions To the Ray Tracing Enginementioning

confidence: 99%

Ray Tracing RF Field Prediction: An Unforgiving Validation

Vitucci

Degli-Esposti

Fuschini

et al. 2015

International Journal of Antennas and Propagation

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The prediction of RF coverage in urban environments is now commonly considered a solved problem with tens of models proposed in the literature showing good performance against measurements. Among these, ray tracing is regarded as one of the most accurate ones available. In the present work, however, we show that a great deal of work is still needed to make ray tracing really unleash its potential in practical use. A very extensive validation of a state-of-the-art 3D ray tracing model is carried out through comparison with measurements in one of the most challenging environments: the city of San Francisco. Although the comparison is based on RF cellular coverage at 850 and 1900 MHz, a widely studied territory, very relevant sources of error and inaccuracy are identified in several cases along with possible solutions.

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“…Such residual ray discontinuities, if significant, together with the fact that a vanishing field is predicted in their associated ray shadow regions might render the resulting UTD description inaccurate. Therefore, higher order ray contributions must be added to complete the field description to remove the above deficiency, namely one may need to add vertex diffracted rays [9]- [14], doubly and triply wedge diffracted rays [15], [16], wedge diffraction of creeping waves [17], and wedge excited creeping wave ray fields [18], [19]. These contributions augment the asymptotic solution to higher orders outside their respective ray SB transition regions, and their uniform description restores the continuity of the field at the wedge diffracted and creeping wave-induced surface ray SBs.…”

Section: Introductionmentioning

confidence: 99%

A Uniform Geometrical Theory of Diffraction for Vertices Formed by Truncated Curved Wedges

Albani

Carluccio

Pathak

2015

IEEE Trans. Antennas Propagat.

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A uniform geometrical theory of diffraction (UTD) ray analysis is developed for analyzing the problem of electromagnetic (EM) scattering by vertices at the tip of a pyramid formed by curved surfaces with curvilinear edges when illuminated by an arbitrarily polarized astigmatic wavefront. The UTD vertex diffraction coefficient involves various geometrical parameters such as the local radii of curvature of the faces of the pyramid, of its edges, and of the incident ray wavefront, and it is able to compensate for those discontinuities of the field predicted by the UTD for edges (i.e., geometrical optics (GO) combined with the UTD edge diffracted rays) occurring when an edge diffraction point lies at the tip or vertex. This provides an effective engineering tool able to describe the field scattered by truncated edges in curved surfaces within a UTD framework, as required in modern ray-based codes. Some numerical examples highlight the accuracy and the effectiveness of the proposed UTD ray solution for vertex diffraction. Index Terms-Asymptotic diffraction theory, diffraction, geometrical theory of diffraction, uniform theory of diffraction.Manuscript He has coauthored more than 60 journal papers and more than 160 conference papers. His research interests include the areas of high-frequency methods for electromagnetic scattering and propagation, numerical methods for array antennas, antenna analysis and design, and metamaterials. Dr.

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A UTD Triple Diffraction Coefficient for Straight Wedges in Arbitrary Configuration

Cited by 16 publications

References 22 publications

A Survey of Efficient Ray-Tracing Techniques for Mobile Radio Propagation Analysis

A Survey of Efficient Ray-Tracing Techniques for Mobile Radio Propagation Analysis

Ray Tracing RF Field Prediction: An Unforgiving Validation

A Uniform Geometrical Theory of Diffraction for Vertices Formed by Truncated Curved Wedges

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