Abstract: An RFID transponder is embedded in a glass surface, such as a vehicle windshield, to provide for the storage and retrieval of vehicle related data. In an embodiment of the invention, the RFID device comprises a flexible circuit substrate with an antenna formed thereon and a transponder circuit disposed on the substrate and coupled to the antenna. In a multi-layer glass panel, the RFID device is disposed between adjacent ones of the glass layers and becomes embedded therein upon lamination of the glass layers together. Alternatively, the RFID device may be formed using one of the glass layers as a substrate, thereby avoiding the need for a distinct substrate layer. Where a glass panel has a transparent conductive layer for thermal insulation, the transparent conductive layer may be used to form a conductive portion of the RFID device. In a single layer glass panel, the RFID device is embedded into the glass while the glass is in a molten or plastic state.

Abstract: A sticker transponder adapted to be affixed to a glass surface, such as a vehicle windshield, includes a RFID transponder enabling the storage and retrieval of vehicle related data. The sticker transponder comprises a flexible circuit substrate having an antenna formed thereon and a transponder circuit disposed on the substrate and coupled to the antenna. An adhesive layer is coupled to a first surface of the flexible circuit substrate. An indicia layer is coupled to a second surface of the flexible circuit opposite from the first surface. The indicia layer comprises a space permitting indicia to be printed thereon. The antenna has a characteristic impedance defined in part by a dielectric constant of the flexible circuit substrate in combination with a dielectric constant of the glass surface. As a result, a proper impedance match between the antenna and the transponder circuit is achieved only when the sticker is affixed to the glass surface.