Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TE1
Session:
Number:3TE1-1
Application of the Complex Source Point Method for Analyzing the Diffraction of an Electromagnetic Gaussian Beam by a Cylinder Using UTD Concepts
Titipong Lertwiriyaprapa, Kittisak Phaebua, Chuwong Phongcharoenpanich, Monai Krairiksh,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
This work presents the extension of the well established UTD ray analysis of the diffraction by a cylinder illuminated by a ray optical spherical wave generated by a point current (3D) to treat the diffraction of an incident GB by the same structure via the CSP technique. In particular, in the CSP method, a point source in real space becomes a CSP by replacing its real position coordinates by appropriate complex values; in so doing, this CSP generates a rotationally symmetric GB field in its paraxial region. The diffraction of the GB incident on the conducting cylinder is then found via the CSP technique by analytically continuing the corresponding UTD ray solution to include the complex point source coordinates. Since the point source is in complex space, it is noted that the points of reflection and diffraction in general turn out to be in complex space as well. The CSP method thus allows one to directly obtain a closed form analytically continued UTD solution for the 3D electromagnetic diffraction by cylinders illuminated by a rotationally symmetric GB. As mentioned earlier, a relatively general antenna illumination can be easily represented by a sequence of GBs. Therefore, by superposing the diffraction fields of each GB in the sequence, it is possible to find the total scattered field in an efficient manner from a large structure containing curved surfaces when the latter is illuminated by a complicated antenna pattern. This work will be very useful for the path loss prediction in a Thai commercial orchard [11]