US Patent 7479886 Antenna capacitance for energy storage

Various embodiments of the invention may include an antenna for a wireless device, the antenna operable to store electrical energy received from a power source. The stored electrical energy may then be used to power the circuitry of the device. Storing electrical power in this manner may allow the device to temporarily continue operating when the incoming harvested energy becomes too weak to instantaneously provide all the power needed to continue operating the device. In some embodiments the wireless device is a radio frequency identification (RFID) tag.