Purpose: The E-polarized wave diffraction by an infinite periodic strip grating without a single strip is considered.Design/methodology/approach: The total field is found as a sum of field of infinite periodical grating and field induced by the removal of a single strip. The problem is reduced to the singular integral equations with additional conditions.Findings: The directional patterns and field distribution in the domain above the grating are represented.Conclusions: The effective algorithm for study of the field which appeared as a result of absence of a single strip is suggested.
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