Applying GTD to calculate the RCS of polygonal plates

A difficulty that may be encountered in applying the geometrical theory of diffraction (GTD) to calculate the radar cross section (RDC) of polygonal plates is discussed. The simple example of a square plate is considered and it is shown that when the same specular direction is reached through two different pattern cuts, a different value of the total scattered field is obtained. This difference may be quite noticeable for impedance plates. Its physical explanation suggests a suitable alternative approach to overcome this difficulty.<
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