International Symposium on Antennas and Propagation
FVTD Analysis of Propagation Characteristics in Relation to Random Rough Surface Spectrum
Junichi HONDA, Kazunori UCHIDA,
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The role of information and communication technology is increasing in the modern society. Recently, the sensor network among the wireless networks have been attracting attention of research community. In order to construct the wireless network system among many sensors located randomly on rough surfaces, such as desert, hilly terrain, forest and sea surfaces, it is important to theoretically investigate the propagation characteristics of electromagnetic waves under these physical enviroments . It is also important to investigate radiation problem from antenna of sensor device located on the rough surface. We investigate propagation characteristics of electromagnetic waves along random rough surfaces. Gaussian spectrum is often used for random rough surface generation, but it is inadequate to deal with complicated environments. We consider here three types of spectrum density functions for random rough surfaces, that is, Gaussian, n-th order power law and exponential. Rough surfaces are generated by Fast Fourier Transform (FFT), and electromagnetic fields along rough surfaces are computed numerically by using Finite Volume Time Domain (FVTD) method. The distance characteristics of propagation above rough surfaces are discussed.