A uniform GTD analysis of the diffraction of electromagnetic waves by a smooth convex surface

Pathak, P.H.; Burnside, W. D.; Marhefka, R.J.

doi:10.1109/tap.1980.1142396

Cited by 232 publications

(124 citation statements)

References 13 publications

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“…The incident ray from the TX at grazing launches a set of surface rays which propagate along a geodesic path on the convex surface, thereby carrying energy into the shadow region. The field associated with these surface rays attenuates due to a continuous shedding or diffraction of rays from the surface rays along the forward tangents to the geodesic surface ray paths [8]. So, the RX in the shadow region can receive the signal sent by the TX.…”

Section: Uniform Theory Of Diffractionmentioning

confidence: 99%

“…Penetration loss caused by wood and glass with different thicknesses and surfaces, as well as signal attenuation caused by trees were also measured in [5].The attenuation of an indoor wireless channel at 60 GHz has also been reported in [6,7]. In the literature [8], P.H. Pathak and his colleague analyzed the diffraction of electromagnetic waves by a smooth convex surface, and deduced the relative diffraction parameters under the condition that the signal source is on the surface or blocked.…”

Section: Introductionmentioning

confidence: 99%

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The Diffraction Research of Cylindrical Block Effect Based on Indoor 45 GHz Millimeter Wave Measurements

2017

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Abstract:In this paper, four kinds of block diffraction models were proposed on the basis of the uniform geometrical theory of diffraction, and these models were validated by experiments with 45 GHz millimeter wave in the laboratory. The results are in agreement with the theoretical analysis. Some errors exist in the measurement results because of the unsatisfactory experimental environment. Single conducting cylindrical block measurement error was less than 0.5 dB, and single man block measurement error in the school laboratory was less than 1 dB, while in the factory laboratory environment, the peak to peak error reached 1.6 dB. Human body block attenuation was about 5.9-9.2 dB lower than that of the single conducting cylinder. A human body and a conducting cylinder were used together as a block in model (c) and model (d), but the positions of the cylinder in the two models were different. The measurement results showed that the attenuation of model (d) is about 3 dB higher than that of model (c).

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Section: Uniform Theory Of Diffractionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Diffraction Research of Cylindrical Block Effect Based on Indoor 45 GHz Millimeter Wave Measurements

2017

Information

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“…The computational aspects of the functions and other parameters can be found in [2][3][4][5]. Among the three rays, the second will be the dominant in contributing to the received signal strength since it subjects to single surface diffraction while all others have at least two successive diffractions.…”

Section: D Modelling Of Multiple Non-polygonal Structuresmentioning

confidence: 99%

“…That the buildings are modelled as polygonal in vertical and horizontal plane simplifies a complex structure to a simpler one. In determining signal level at a receiver location, ray tracing codes have used ray optical techniques referred to as the Uniform Theory of Diffraction (UTD) [1][2][3]. When the geometry of the building structure in the environment is simulated as polygons for use in database, the diffraction and reflection points of each ray path will be determined via solutions of linear systems of planar geometries, and it makes the ray tracing codes run faster.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Shadowing Loss Due to Huge Non-Polygonal Structures in Urban Radio Propagation

Kara¹,

Yazgan²

2008

PIER B

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Abstract-Ray tracing algorithms rely on two dimensional or three dimensional database. They use ray optical techniques referred to as the uniform theory of diffraction (UTD) using building database given as polygons. Building geometries can also be modelled as having non-planar geometries, and this would be important in modeling of shadowing loss due to curved structures in urban radio propagation. To demonstrate modelling of buildings as non-polygonal geometries, a particular building composition involving 3D cruved geometries is chosen, and shadowing loss for this building composition is studied via UTD ray tracing. Building structure considered in this study involves main canonical shapes of non-planar geometries including cone, cylinder and sphere. Single and multiple interaction of surface diffractions, effect of creeping waves are taken into consideration in the analysis. † Also with TUBITAK, UEKAE/G222 Ataturk Bulvari, No:211, Kat:7/20,

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“…Even if the efficiency has been enhanced, it needs unbearable hardware requirements in solving electronically large problems. When analyzing EMC problems of electrically large platforms, UTD [13,14] method is widely used and reasonably effective. Based on ray solutions, UTD is an efficient high-frequency method, which is utilized to calculate the scattered field from electrically large platform in this paper.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Complex Antenna Around Electrically Large Platform Using Iterative Vector Fields and Utd Method

He¹,

Huang²,

Liang³

2009

PIER M

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Abstract-A new efficient technique for the analysis of complex antenna around a scatterer is proposed in this paper, termed the iterative vector fields with uniform geometrical theory of diffraction (UTD) technique. The complex field vector components on the closed surface enclosing the antenna without platform are computed by higher order Method of Moments (MOM), and the scattered fields from the platform are calculated by UTD method. The process of iteration is implemented according to the equivalence theorem. Based on this approach, an approximation method is outlined, in which the computational time is saved largely, while the accuracy is not reduced. The relative patterns obtained from the present method and the approximation method both show good agreements with that obtained from MOM.

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A uniform GTD analysis of the diffraction of electromagnetic waves by a smooth convex surface

Cited by 232 publications

References 13 publications

The Diffraction Research of Cylindrical Block Effect Based on Indoor 45 GHz Millimeter Wave Measurements

The Diffraction Research of Cylindrical Block Effect Based on Indoor 45 GHz Millimeter Wave Measurements

Modelling of Shadowing Loss Due to Huge Non-Polygonal Structures in Urban Radio Propagation

Analysis of Complex Antenna Around Electrically Large Platform Using Iterative Vector Fields and Utd Method

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