Nonuniform air grid

A housing wall for a housing of an electric or electronic device, the housing wall comprising:

• at least one air grid having at least a first layer with a first mesh structure and a second layer with a second mesh structure,
• wherein the first mesh structure and the second mesh structure at least partially comprise an electrically conductive material,
• wherein the first mesh structure is coextensively arranged with the second mesh structure,
• wherein the first layer and the second layer are electrically conductively coupled,
• wherein the first mesh structure comprises a first plurality of through-holes, wherein the second mesh structure comprises a second plurality of through-holes,
• wherein the through-holes of the first plurality of through-holes are misaligned compared to through-holes of the second plurality of through-holes such that a nonuniform total through-hole configuration of the air grid is provided, wherein the total through-hole configuration is irregular,
• wherein the housing wall provides an electrical shielding for electromagnetic waves having a frequency of 1 GHz or more,
• wherein the first mesh structure comprises a pattern of through-holes having a first shape,
• wherein the second mesh structure comprises a pattern of through-holes having a second shape, wherein the first shape and the second shape are the same, and
• wherein the second mesh structure comprises a through-hole pattern which represents a non-integer multiple of a through-hole pattern of the first mesh structure.