In RFID applications the use of the electromagnetic field for the power supply of transponders is state-of-the-art. In the context of this presentation the use of the electromagnetic energy for the operation of sensor modules will be discussed. Based on the question, if the omnipresent radiation from the power supply network and from radio transmitters and mobile phone base stations is useable (Energy Harvesting), the feasibility for the operation of self-sufficient sensor modules especially for the use in the building automation area is explained. Additional conditions of this applications (operating range, measured variable) and technology (antennas, frequencies) are considered
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