Abstract

This paper presents a selection guide for metal mesh based on shielding effectiveness and optical visibility requirements. Concepts of mesh sizing, wire diameter, metal type, opening size, and mesh patterning are discussed. The guide provides a detailed explanation of factors that contribute to the shielding performance and optical transparency of mesh. Metal mesh has a range of applications in the microwave and electromagnetic compatibility (EMC) industries because they are advantageous for protecting chamber viewing windows and shielding optoelectronic devices. Shielding effectiveness performance is dependent on the mesh sizing, wire diameter, and opening size. Denser mesh yields superior shielding, but with limited optical visibility. A tradeoff between shielding performance and optical quality is necessary, where this paper can be used to determine an optimal solution. For ideal optical properties, the mesh sizing is critical since it determines the visibility through the material. Although multi-layer mesh offers additional shielding, this layering is associated with a reduction in visibility due to the mesh density and patterning from the Moiré effect. Using this paper, an educated technical decision can be made on the metal mesh best suited to satisfy shielding effectiveness and optical visibility requirements for a specific application.

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