Analysis and comparison on roughness at millimetre wave

This paper described for the propagation characteristics due to the rough surface of an object at millimeter wave. The analysis used the high frequency asymptotic approaches such as the ray tracing mechanism and Kirchhoff approximation. In results, the roughness of the surface at millimetre wave may make the deep fading. Therefore, the accuracy of the surface is so important to estimate the radio propagation characteristics at millimetre wave.