Abstract
Fraunhofer diffraction by two long, thin, parallel, conducting strips is investigated for the case in which the radiation incident upon the strips is polarized with the electric field vector parallel to the strip axes. The strip faces are inclined with respect to each other and the incident radiation. Experimental results using 5-mm microwaves are compared with theoretical diffraction patterns predicted by scalar Kirchhoff theory and Keller’s geometrical theory of diffraction. The latter is carried out to second order in an attempt to account for some interactions between the strips in the form of doubly diffracted radiation. It is found that the geometrical theory, even to first order, is better able to describe the results obtained experimentally.
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