Determining polarization dependent diffraction coefficients from building edges using FDTD method
Master of Science (MS)
First Advisor's Name
Tadeusz M. Babij
First Advisor's Committee Title
Second Advisor's Name
Third Advisor's Name
Subbarao V. Wunnava
Date of Defense
Electromagnetic waves in suburban environment encounter multiple obstructions that shadow the signal. These waves are scattered and random in polarization. They take multiple paths that add as vectors at the portable device. Buildings have vertical and horizontal edges. Diffraction from edges has polarization dependent characteristics. In practical case, a signal transmitted from a vertically polarized high antenna will result in a significant fraction of total power in the horizontal polarization at the street level. Signal reception can be improved whenever there is a probability of receiving the signal in at least two independent ways or branches. The Finite-Difference Time-Domain (FDTD) method was applied to obtain the two and three-dimensional dyadic diffraction coefficients (soft and hard) of right-angle perfect electric conductor (PEC) wedges illuminated by a plane wave. The FDTD results were in good agreement with the asymptotic solutions obtained using Uniform Theory of Diffraction (UTD). Further, a material wedge replaced the PEC wedge and the dyadic diffraction coefficient for the same was obtained.
Asrani, Vijay L., "Determining polarization dependent diffraction coefficients from building edges using FDTD method" (1999). FIU Electronic Theses and Dissertations. 1330.
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