Fraunhofer diffraction by two long, thin, parallel conducting strips in a plane is investigated experimentally using microwaves whose wavelength is of the order of the strip width. The radiation is polarized with the electric field vector parallel to the strip axes. The results are compared with scalar theory, employing either the obliquity factor suggested by Stokes or that obtained in a Kirchhoff theory development. It is found for this polarization that, while both scalar theories give fairly good agreement with experimental results, the one employing Kirchhoff's obliquity factor more closely predicts the results obtained in the laboratory.

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