I read, in a previously posted answer to the question How Much Electricity Is Generated by Passive RFID Tags?, that "a modern passive tag is designed to operate (at maximum range) on only 1 microwatt of power—typically, at a power supply voltage of 1V with a current drain of about 1 microamp." Could the electricity generated be used to power other components connected to the RFID tag?
In 2011, wireless solutions provider RFID Sensor Systems met with several potential partners to market passive ultrahigh-frequency (UHF) EPC Gen 2 RFID tags that included various sensors and could transmit sensor data without the use of a battery. The firm developed the technology to provide end users with small, inexpensive RFID sensor tags that would not require battery replacement (see N.J. Company Seeks to Market Passive Sensor RFID Tags). The company currently offers the Ranger family of passive temperature sensors, comprising models ST050-1 and ST050-2 , ST070-1 and ST070-2.
—Mark Roberti, Founder and Editor, RFID Journal