Abstract
The scattering of two‐dimensional Hermite–Gaussian beams of arbitrary order from a conducting irregular surface is analyzed by using the Kirchhoff or physical optics approximation and the plane‐wave spectrum representation. Both coherent and incoherent components of the mean scattered power are derived. It is shown that, for the normal incidence of a fundamental beam, the decrease of the beam radius or spot size gives rise to the decrease of the ratio of the coherent component to the incoherent one in the backscattering. However, for the obliquely incident case, the ratio is increased by the decrease of the beam radius. For the first‐order beam incidence, the deep dip appearing in the specular direction in the mean scattered power pattern rapidly disappears as the surface roughness is increased.
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