The present invention concerns an insulating glazing unit (1) adapted to let pass electromagnetic radiation with low transmission loss for receiving electromagnetic radiation. The insulating glazing unit (1) comprises: a first windowpane (3) defining at least a first surface (13) and a second surface (15), the first windowpane (3) comprising a first polymer layer (21) and/or a first glass layer (23); a second windowpane (5) defining at least a third surface (17) and a fourth surface (19), the second pane (5) comprising a second polymer layer (21) and/or a second glass layer (23); and a structured coating (25) with thermal emissivity below 20% placed on one or more of the surfaces (13, 15, 17, 19). The coating (25) is divided into electrically conductive elongated patches, which are electrically insulated from each other. The relative permittivity of at least one layer of the first layer(s) (21, 23) and/or the second layer(s) (21, 23) is below 5.5 at one or more frequencies in the range of 300 MHz to 70 GHz.