Chin-Yuan Hsieh


A novel measurement system for electromagnetic wave bistatic scattering from dielectric rough surface is constructed to better describe the wave interaction with the random media. Electromagnetic wave interaction with random media is a process to improve the theoretical representations. Existing assumptions and appreciations sometimes remain unjustified since the scattering phenomena are not fully understood. To improve the bistatic measurement both a horn antenna operating in the far-field and a parabolic-dish antenna operating in the near field focus mode are utilized. The transmitter for the active system is a linearly polarized, helium-neon laser operating in the red light region. The receiver measures both like- and cross-polarized returns. This helps assess the scattered radiation pattern. A flat metal plate is developed to calibrate the measuring facility. The system is automated and consists of a spherical frame over which the transmitter and receiver travel. The comparisons of experimental measurements with the model prediction based on the integral equation method are made to evaluate the accuracy, repeatability, and utility of the helium-neon laser measurement system.

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