Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


osu1196281470.pdf (6.65 MB)

ETD Abstract Container

Abstract Header

An approximate UTD development for the radiation by antennas near or on thin material coated metallic wedges

Lertwiriyaprapa, Titipong
http://rave.ohiolink.edu/etdc/view?acc_num=osu1196281470

Abstract Details

2007, Doctor of Philosophy, Ohio State University, Electrical Engineering.
Approximate and relatively simple but closed form Uniform Geometrical Theory of Diffraction (UTD) solutions are obtained for describing the radiated, scattered and surface wave fields, respectively, excited by sources near or on a canonical geometry consisting of a thin, planar, three-dimensional (3-D) double positive/double negative (DPS/DNG) material coated metallic wedge with an arbitrary wedge angle. Thus, unlike previous works that consider primarily plane wave scattering by such DPS structures via the Wiener-Hopf (W-H) or Maliuzhinets (MZ) methods, the present development can also treat radiation and coupling problems of antennas near or on finite material coated metallic surfaces. The latter is made possible mainly through the introduction of higher order UTD slope diffraction terms added to first order UTD. It is noted that all previous solutions based on rigorous W-H and MZ formulations employ approximate boundary conditions; in contrast, the present solutions, which are developed via a heuristic spectral synthesis approach, recover the proper local plane wave Fresnel reflection and transmission coefficients and surface wave constants of the DPS/DNG material. They also include the presence of backward surface waves in DNG media. Besides being asymptotic solutions of the wave equation, the present UTD diffracted fields satisfy reciprocity to first order UTD, the radiation condition, boundary conditions on the conductor, and the Karp-Karal lemma which dictates that the first order UTD space waves vanish on a material interface.
Prabhakar Pathak (Advisor)
191 p.
Uniform Geometrical Theory of Diffraction; UTD; diffraction; slope diffraction; wedge; material coated metallic; backward surface wave; double negative material

Recommended Citations

Citations

  • Lertwiriyaprapa, T. (2007). An approximate UTD development for the radiation by antennas near or on thin material coated metallic wedges [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1196281470

    APA Style (7th edition)

  • Lertwiriyaprapa, Titipong. An approximate UTD development for the radiation by antennas near or on thin material coated metallic wedges. 2007. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1196281470.

    MLA Style (8th edition)

  • Lertwiriyaprapa, Titipong. "An approximate UTD development for the radiation by antennas near or on thin material coated metallic wedges." Doctoral dissertation, Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1196281470

    Chicago Manual of Style (17th edition)

osu1196281470
2,002
© 2007, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.