Abstract
The diffraction induced on a plane wave by an aperture in a thick rigid screen is investigated through the use of an expedient numerical method based upon Green’s function theory, quite convenient when the slit is few wavelengths large. The results show that the screen thickness is a parameter widely influencing the diffracted wave patterns. Particularly, it has been found that the transmission factor curves are characterized by resonance peaks. By thickening the screen, sharper and stronger peaks are obtained. Further, if resonances involve slit transversal modes, the farfield energy angular distribution undergoes strong variations when the wavenumber is moved from one to the other side of the peak.
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