Building material

An insulation glass unit for a wall or façade of a building envelope for improving quality of reception of a wireless communication device inside the building from a base station located outside of the building by boosting transmission of electromagnetic signals through the building envelope, the insulation glass unit comprising at least one electrically conductive low emissivity surface having at least a first aperture and a second aperture, wherein

• said first aperture and said second aperture are isolated from each other for providing narrow aperture diffraction and to obtain diversity reception at a first frequency in shadow areas inside the building, and
• a distance between said first aperture and said second aperture is between 1 and 10 meters to provide an envelope correlation coefficient of less than 0.1 for said apertures at the first frequency.

An insulation glass unit for a wall or façade of a building envelope for improving quality of reception of a wireless communication device inside the building from a base station located outside of the building by boosting transmission of electromagnetic signals through the building envelope, the insulation glass unit comprising at least two glass panes and at least one of the two glass panes comprising at least one electrically conductive low emissivity surface having at least a first aperture and a second aperture, wherein

• said first aperture and said second aperture are isolated from each other for providing narrow aperture diffraction and to obtain diversity reception at a first frequency in shadow areas inside the building, and
• a distance between said first aperture and said second aperture is between 1 and 10 meters to provide an envelope correlation coefficient of less than 0.1 for said apertures at the first frequency.