Patent ID: 7181164
Filing Date: 2007-02-20
Classification: H04B

Abstract:
1. A battery modem using a short range wireless technology in a data communication on apparatus as capable of performing wired/wireless data communication, wherein the battery modem detects base band communication data from a power supply line of the data communication apparatus on the basis of the short range wireless technology and a power line modem scheme, converts the data into an RF signal and transmits the RF signal to a data communication apparatus or the other party through a power supply line antenna, and the battery modem receives the RF signal from the power supply line antenna, converts the RF signal into the communication data and outputs the data to the data communication apparatus, wherein, in the case that a power supply battery used to supply power to the data communication apparatus and the battery modem is mounted in the battery receiving case, a battery is connected to the battery modem serially or in parallel, wherein the battery modem further includes a contact terminal used to contact the power supply batter so that the modem is supplied with (−) power, from the power supply battery, and wherein in the case that the power supply battery is constructed by connecting a first battery and a second battery serially, both being low capacity batteries, the battery modern further includes a switch for selecting a battery voltage, through which the contact terminal of the battery modem is contacted with the first or the second battery so that the battery modem is supplied with the (−) power supply.