A theoretical-experimental study of absolute diffraction at microwave frequencies has been conducted. The field strength in the geometric shad or zone can be predicted from classical (Fresnel-Kirchhoff ) diffraction theory when the obstacle approximates the idealized knife edge. However, the modest amount of empirical knowledge available precludes an engineering evaluation of the obstacle-diffraction propagation mechanism from the viewpoint of microwave communications. This study was under-taken in order to describe more fully the characteristics of diffraction propagation, as well as to add to the body of experimental data, While the main concern was the total nature of the propagation, emphasis was given those factors which may affect the successful transmission of information
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