UTD-diffraction coefficients for higher order wedge diffracted fields

An asymptotic expansion of a multiple integral for knife-edge diffraction is derived. The expansion expresses the field in terms of single-edge diffraction. By considering this expression, a similar expansion for higher order UTD diffracted fields is proposed. By means of a set of transition functions, the result removes some of the shortcomings of the original set out of the UTD when the incident field is not a ray-optical field.

[1]  R. Luebbers.  A heuristic UTD slope diffraction coefficient for rough lossy wedges , 1989 .

[2]  Ray‐optical analysis of fields on shadow boundaries of two parallel plates , 1975 .

[3]  R. Luebbers.  Finite conductivity uniform GTD versus knife edge diffraction in prediction of propagation path loss , 1984 .

[4]  R. Kouyoumjian,et al.  A uniform geometrical theory of diffraction for an edge in a perfectly conducting surface , 1974 .

[5]  L. Vogler.  An attenuation function for multiple knife‐edge diffraction , 1982 .

[6]  Giuliano Manara,et al.  High-frequency scattering from a wedge with impedance faces illuminated by a line source. I. Diffraction , 1989 .

[7]  D. S. Jones.  DOUBLE KNIFE-EDGE DIFFRACTION AND RAY THEORY , 1973 .

[8]  R. Kouyoumjian.  The geometrical theory of diffraction and its application , 1975 .

[9]  Roberto G. Rojas,et al.  Electromagnetic diffraction of an obliquely incident plane wave field by a wedge with impedance faces , 1988 .

[10]  R. Tiberio,et al.  An analysis of diffraction at edges illuminated by transition region fields , 1982 .

[11]  K. Furutsu,et al.  On the theory of radio wave propagation over inhomogenous earth , 1963 .

[12]  L. Vogler.  The Attenuation of Electromagnetic Waves by Multiple Knife-Edge Diffraction , 1981 .

[13]  M. J. Mehler,et al.  Cascaded cylinder model for predicting terrain diffraction loss at microwave frequencies , 1989 .

[14]  J. Volakis.  A uniform geometrical theory of diffraction for an imperfectly conducting half-plane , 1986 .

[15]  Raymond J. Luebbers,et al.  A general, uniform double wedge diffraction coefficient , 1991 .

[16]  R. Tiberio,et al.  A uniform GTD solution for the diffraction by strips illuminated at grazing incidence , 1979 .

[17]  High-frequency electromagnetic scattering of plane waves from double wedges , 1989 .

[18]  I. Ciric,et al.  Improved formulas for the diffraction by a wedge , 1993 .

[19]  A. Michaeli.  A new asymptotic high‐frequency analysis of electromagnetic scattering by a pair of parallel wedges: Closed form results , 1985 .

[20]  Diffraction by a thick perfectly conducting half-plane , 1987 .

[21]  Roger F. Harrington,et al.  Radiation and scattering from large polygonal cylinders, transverse electric fields , 1975 .

[22]  A hybrid asymptotic solution for the scattering by a pair of parallel perfectly conducting wedges , 1990 .

[23]  Derek A. McNamara,et al.  Introduction to the Uniform Geometrical Theory of Diffraction , 1990 .

[24]  G. Pelosi,et al.  High-frequency scattering from a wedge with impedance faces illuminated by a line source. II. Surface waves , 1993 .

[25]  J. Keller,et al.  Geometrical theory of diffraction. , 1962, Journal of the Optical Society of America.

[26]  Raj Mittra,et al.  On the investigation of diffracted fields at the shadow boundaries of staggered parallel plates—A spectral domain approach , 1977 .

[27]  Giuseppe Pelosi,et al.  A uniform GTD formulation for the diffraction by a wedge with impedance faces , 1985 .

[28]  R. Tiberio,et al.  Calculation of the high-frequency diffraction by two nearby edges illuminated at grazing incidence , 1984 .

[29]  R. G. Kouyoumjian,et al.  Diffraction by a perfectly conducting rectangular cylinder which is illuminated by an array of line sources , 1974 .

[30]  Yahya Rahmat-Samii,et al.  GTD, ray field, and comments on two papers , 1978 .

[31]  J. Whitteker,et al.  A series solution for diffraction over terrain modeled as multiple bridged knife edges , 1993 .

[32]  Shung-wu Lee,et al.  High-frequency diffraction of a line-source field by a half-plane: Solutions by ray techniques , 1977 .

[33]  K. Jakobsen.  An alternative diffraction coefficient for the wedge , 1984 .

[34]  R. Luebbers,et al.  Propagation prediction for hilly terrain using GTD wedge diffraction , 1984 .