The scattering of a plane H-polarized wave from a grating composed of narrow grooves in a perfectly conducting surface is investigated theoretically using conformal transformation techniques. The theory is exact in the limit a/d → 0, where a is the slot width and d is the grating period, and remains valid for practical values of a/d. A necessary condition is derived for the elimination of the specularly reflected wave. When only the −1 and 0 order space waves are present, this condition becomes just the well-known Bragg condition.
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