Open-type magnetic shield structure and its performance

We propose a new type of magnetic shield structure, in which some closed magnetic paths surround a defined space. Because there are some openings between paths, the freedom in designing and the ease of constructing a shield room are attained. This structure shows better magnetic shield performance than conventional shield structures when openings between magnetic paths, widths of magnetic paths, and weight distribution of magnetic materials are designed appropriately. Index Terms--Electrical steels, magnetic noise, permeability, saturation magnetization, shield coefficient, shield efficiency, soft magnetic materials.