Der Einfluß der Krümmung eines Schirmrandes auf die Beugung elektromagnetischer cm-Wellen

Abstract

The diffraction of electromagnetic cm-waves passing by the straight edge of a metal screen was experimentally investigated. The diffraction which depends on the polarisation of the waves and the thickness of the screen was measured within a range of about 20 wavelengths around the edge of the screen. The results agree with the theory ofSommerfeld and the investigations ofFranz andDeppermann.

The intensity function of the waves near the edge of the screen shadow depends — according to our measurements — on the curvature of the screen edge. This agrees with the theoretical postulation ofArtmann: if the radius of the screen edge isa>λ the diffraction fringes appearing around the shadow of the screen edge are shifted towards the light area whenσ-polarized radiation is used. When usingπ-polarized radiation a shift towards the shadow area ist observed.