A diffusion imaging method is provided. According to the invention, a membrane concentration step is performed between the disintegration step and the drying step. Station location information is generated, in response to the request, the station location information including station location information of one or more radio stations that correspond to the location of the mobile device. A semiconductor die is attached to the substrate sheet such that electrodes or bonding pads of the die are mounted to respective die mounting pads of the substrate sheet.