Patent ID: 7925308

Claim:
A method for powering a mobile device having an energy harvester, the method comprising: converting, during a first time period, the wireless energy by the energy harvester of the mobile device into current when the mobile device is in the portal, wireless energy being transmitted in the portal to the energy harvester of the mobile device to receive and convert into current when the mobile device is in the portal, the mobile device being in the portal during the first time period; charging a charge storage element of the mobile device when the mobile device is in the portal during the first time period using at least a portion of the current; enabling a communication transceiver at the mobile device in response to the charging and during the first time period, the communication transceiver operatively coupled to the energy harvester; and disabling the communication transceiver during a second time period, the second time period being after the first time period, the mobile device being out of the portal during the second time period, at least a portion of the mobile device being operable using current from the charged charge storage element during the second time period, the disabling being in response to the mobile device moving out of the portal.